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Pincer Nail in the Foot

Pincer nail deformity is a chronic nail disorder in which the nail plate develops excessive transverse curvature, causing its lateral edges to curve downward and pinch the nail bed and surrounding soft tissue. Although it may appear to be a simple cosmetic problem, in the foot—particularly the hallux—it can produce substantial pain, recurrent inflammation, impaired footwear tolerance, and reduced quality of life. The condition is also known as trumpet nail, incurvated nail, or omega nail, reflecting the characteristic shape of the affected nail plate

Definition and Clinical Appearance

Pincer nail deformity was first described by Cornelius and Shelley in 1968 as a transverse distal overcurvature of the nail. It is defined by an increase in the nail’s maximum transverse curvature, usually becoming more pronounced from proximal to distal. As the curvature increases, the lateral margins descend into the nail folds, compressing the distal nail bed in a pincer-like manner.

Clinically, the nail often appears thickened, narrowed distally, and excessively convex in the transverse plane. In advanced cases, the free edge may resemble a tube or clamp around the toe. The great toenail is most commonly affected, although lesser toenails and fingernails can occasionally be involved. The deformity may be symmetrical or asymmetrical, and it may affect one or both sides of the hallux.

Patients commonly report pain with pressure from footwear, walking, or direct palpation. The compressed lateral nail folds may become erythematous, swollen, and tender. Secondary paronychia, onychomycosis, and recurrent bacterial infection can occur because persistent mechanical trauma disrupts the nail unit and creates a moist, inflamed environment.

Epidemiology and Impact

Pincer nail deformity is reported to affect approximately 0.9% of the population. It is predominantly a disorder of the toenails, with the hallux most frequently involved. While it can occur at any age, it is often more clinically significant in adults because the deformity tends to progress and becomes more symptomatic over time.

The functional consequences should not be underestimated. Pain during gait, difficulty wearing enclosed shoes, and cosmetic embarrassment may lead patients to alter their activity levels. In severe cases, chronic inflammation and infection can interfere with daily activities and, rarely, more serious complications such as osteomyelitis of the distal phalanx have been described

Aetiology and Pathogenesis

The exact cause of pincer nail deformity is not fully understood, and it is best regarded as a multifactorial condition. Both congenital and acquired forms exist. Congenital cases may involve an inherited structural predisposition affecting the nail matrix or distal phalanx, whereas acquired cases are more commonly associated with local mechanical and systemic factors.

One widely proposed mechanism involves enlargement or osteophyte formation at the base of the distal phalanx. Because the nail matrix is closely associated with the underlying bone and soft tissues, expansion in this region may alter the shape of the growing nail plate. The result is reduced curvature proximally and increased transverse curvature distally, producing the characteristic pincer configuration.

Mechanical loading is also important. Tight or narrow footwear, repetitive trauma, abnormal gait, and reduced upward pressure on the toe pad have all been implicated. Some research suggests that people with pincer nails may experience different foot loading patterns, particularly reduced mechanical force beneath the toe pad, which may contribute to nail overcurvature. Improper nail cutting, immobility, and a bedridden state may further exacerbate the problem by altering normal mechanical forces on the nail unit.

Systemic associations have also been reported, including renal failure, diabetes, peripheral vascular disease, systemic sclerosis, and other connective tissue or inflammatory disorders. These conditions may contribute through changes in tissue structure, circulation, oedema, or nail growth. However, association does not necessarily prove causation, and many patients have no identifiable systemic disease.

Differential Diagnosis

Pincer nail should be distinguished from a conventional ingrown toenail. An ingrown toenail is primarily defined by symptoms and soft-tissue inflammation caused by a nail edge penetrating or irritating the lateral nail fold. Pincer nail, by contrast, is defined by the morphology of the nail plate: excessive transverse curvature with distal pinching of the nail bed. The two conditions may coexist, and a pincer nail can predispose the patient to ingrowth and recurrent paronychia.

Other differential diagnoses include onychomycosis, onychogryphosis, subungual exostosis, psoriatic nail disease, and nail dystrophy secondary to trauma. Careful examination of the nail plate, nail folds, distal phalanx, and footwear is therefore essential. Imaging may be useful when an underlying exostosis, osteophyte, or bony deformity is suspected

Conservative Management

The goals of treatment are to relieve pain, reduce inflammation, correct or reduce the excessive curvature, prevent infection, and improve the patient’s ability to wear shoes comfortably. Management should be individualised according to symptom severity, deformity severity, patient preference, vascular status, and the presence of infection or systemic disease. There is currently no single universally accepted standard treatment.

Conservative care is appropriate for mild to moderate deformities and for patients who wish to avoid surgery. Footwear modification is fundamental: shoes should have a broad, deep toe box to reduce lateral compression of the hallux. Regular professional nail care, careful debridement, and selective thinning of an excessively thick nail plate can reduce pressure and discomfort.

Topical keratolytics, such as high-concentration urea, may soften thickened nail tissue and facilitate reduction of nail bulk. Mechanical techniques, including grinding or filing of the central portion of the nail, can reduce the convex tension and allow the nail to flatten somewhat. These measures are often useful adjuncts but may provide only temporary relief if the underlying curvature remains pronounced

Nail bracing is another important conservative option. Devices made from plastic, composite materials, or superelastic nickel-titanium wire can be applied to the nail plate to redistribute forces and gradually flatten the transverse curvature. Orthonyxial bracing aims to correct the deformity without removing the nail, making it attractive for patients seeking a less invasive approach. However, treatment requires repeated review, and recurrence or only temporary improvement can occur.

Surgical Management

Surgical treatment is generally reserved for severe, painful, or recurrent cases that fail conservative management. The aim is not simply to remove the nail but to correct the factors responsible for excessive curvature and prevent recurrence. Procedures may include partial or total nail avulsion, matrixectomy, soft-tissue procedures, or correction of underlying bony pathology such as distal phalangeal osteophytes.

Some surgical approaches remove a central strip of nail to relieve the pincer effect and allow the remaining nail to flatten. Others combine nail surgery with correction of the nail bed or distal phalanx. Surgical treatment may offer a lower recurrence rate than conservative care, but it carries risks including postoperative pain, infection, poor cosmetic outcome, wound complications, sensory disturbance, and nail deformity if performed incorrectly.

In podiatric practice, the choice of procedure should consider the patient’s vascular supply, healing capacity, diabetes status, infection risk, and expectations regarding cosmesis. A staged approach—starting with infection control, footwear modification, and conservative correction—may be appropriate before committing to definitive surgery.

Prevention and Long-Term Care

Prevention focuses on reducing chronic compression and trauma to the nail unit. Patients should avoid narrow or pointed footwear, maintain appropriate nail-cutting technique, and seek early review for pain, thickening, or curvature of the toenail. For people with diabetes, peripheral arterial disease, or immunosuppression, prompt professional assessment is particularly important because seemingly minor nail inflammation can progress to serious infection.

Long-term follow-up is often necessary. Even after successful correction, the nail may continue to grow with a tendency toward curvature, especially if the underlying anatomical or mechanical factors persist. Regular monitoring, footwear advice, nail bracing where appropriate, and management of systemic contributors can help maintain comfort and reduce recurrence

Pincer nail deformity is more than a cosmetic nail abnormality; it is a painful and potentially disabling condition of the foot. Its pathogenesis involves an interaction between nail anatomy, distal phalangeal structure, mechanical loading, footwear, and sometimes systemic disease. Early recognition allows conservative measures such as footwear modification, debridement, keratolytics, and nail bracing to be used before the deformity becomes severe. For recalcitrant or advanced cases, surgical correction may be required, but treatment must be tailored to the individual patient. A structured, biomechanically informed approach offers the best chance of relieving pain, restoring function, and preventing recurrence.

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Post-Static Dyskinesia in Heel Pain

Post-static dyskinesia is the characteristic pain, stiffness, and altered gait that occurs during the first steps after a period of non-weight-bearing rest. Although most commonly associated with plantar heel pain or plantar fasciopathy, it is best understood as a clinical pattern rather than a diagnosis in itself: it signals that a pain-generating structure in the foot or ankle has been held in a shortened or unloaded position and is then rapidly loaded on standing.

Definition and Clinical Presentation

The term post-static dyskinesia literally describes “pain after static posture.” Patients typically report sharp, stabbing, or burning pain beneath the heel—often at the medial calcaneal tubercle—when rising from bed in the morning or standing after prolonged sitting, driving, or watching television. The discomfort usually eases after several minutes of walking, only to recur after the next period of rest.

This “first-step pain” is one of the most useful historical clues in heel pain assessment. In plantar fasciopathy, pain commonly improves with gentle activity as the tissues warm and become more compliant, then may worsen again with prolonged standing, walking, running, stairs, or push-off. The pattern therefore differs from many mechanical or inflammatory conditions in which pain steadily increases with activity.[

Patients often adopt a guarded gait during the painful first steps: reduced heel loading, shortened stride, avoidance of terminal push-off, or temporary weight shift to the contralateral limb. Although protective in the short term, this altered gait may increase load elsewhere in the foot, ankle, knee, or hip if it persists.

Pathophysiology

The dominant explanation for post-static dyskinesia in plantar heel pain relates to the plantar fascia and its role in the windlass mechanism. During rest—particularly sleep—the ankle often rests in relative plantarflexion and the toes are not actively dorsiflexed. In this position, the plantar fascia and calf-Achilles complex are held in a comparatively shortened state.

On standing, body weight is rapidly transferred through the foot. The ankle moves toward dorsiflexion, the arch lowers under load, and toe extension engages the windlass mechanism, increasing tension in the plantar fascia. If the fascia is degenerated, stiff, or sensitised, this abrupt transition from low tension to high tensile load can provoke intense nociceptive pain.

Histologically, chronic plantar heel pain is more accurately described as plantar fasciosis or plantar fasciopathy than as pure inflammation. Repetitive tensile overload may produce collagen disorganisation, mucoid degeneration, thickening, and reduced tissue tolerance at the fascial origin. The morning pain therefore reflects both mechanical strain on a poorly tolerant tissue and local nociceptor sensitisation.

Reduced ankle dorsiflexion is clinically important because it increases demand on the plantar fascia during gait. A tight gastrocnemius-soleus complex, limited first metatarsophalangeal joint dorsiflexion, prolonged standing, sudden increases in activity, unsupportive footwear, and occupations involving long periods on hard surfaces can all contribute to fascial overload.

Differential Diagnosis

Although post-static dyskinesia strongly suggests plantar fasciopathy, it is not pathognomonic. Nerve-related plantar heel pain, including entrapment of the first branch of the lateral plantar nerve—sometimes termed Baxter’s neuropathy—can also produce marked pain after rest. In neural compression, symptoms may ease with movement and ambulation, whereas fascial pain may initially improve but later increase with sustained load.

Other causes of heel pain should be considered, including calcaneal stress fracture, fat-pad atrophy or contusion, Achilles insertional tendinopathy, retrocalcaneal bursitis, seronegative inflammatory arthropathy, and, less commonly, tumour or infection. A careful history and examination remain essential: point tenderness at the medial calcaneal tubercle supports plantar fasciopathy, whereas diffuse heel tenderness, night pain, swelling, systemic symptoms, or pain that fails to improve with conservative care warrants further investigation.

Clinical Assessment

Assessment should begin by reproducing and characterising the symptom pattern. The clinician should establish whether pain occurs specifically after rest, how long it takes to settle, whether it improves or worsens with walking, and whether it returns later in the day. Palpation of the medial calcaneal tubercle, plantar fascia, Achilles insertion, and potential nerve entrapment sites helps localise the source.

The windlass test can be useful: dorsiflexion of the hallux increases tension through the plantar fascia and may reproduce medial arch or heel pain. Assessment should also include ankle joint range of motion, gastrocnemius and soleus flexibility, subtalar and midtarsal mobility, foot posture, footwear inspection, and observation of gait.

Imaging is not routinely required for typical plantar heel pain but may be appropriate when presentation is atypical, trauma is reported, or symptoms persist despite appropriate management. Weight-bearing radiographs can identify structural contributors, while ultrasound or MRI may demonstrate plantar fascial thickening, tears, or alternative pathology.

Management Implications

Post-static dyskinesia provides a practical treatment target: reduce the abrupt tensile load placed on sensitised tissue at the transition from rest to weight bearing. Initial management commonly includes activity modification, relative rest from aggravating loading, footwear with adequate heel cushioning and arch support, and short-term taping or offloading where appropriate.

Stretching is central to conservative care. Calf and plantar fascia stretching may improve tissue extensibility and reduce the sudden strain experienced on first standing. Night splinting can maintain the ankle and toes in a more dorsiflexed position overnight, reducing the shortening that occurs during sleep and therefore lessening first-step pain.

Orthotic therapy may be useful when excessive pronation, poor shock absorption, or high plantar pressures contribute to symptoms. Footwear changes, heel cups, cushioned insoles, and supportive arch contours can reduce fascial strain. For persistent cases, clinicians may consider extracorporeal shockwave therapy, corticosteroid injection used cautiously, or, rarely, surgical release after failure of structured conservative treatment.

Patient Education

Patients should understand that post-static dyskinesia is not merely “morning pain”; it is a load-sensitive symptom that can occur after any prolonged period of sitting or inactivity. Explaining why the first steps hurt—and why gradual movement often relieves them—improves adherence to stretching, footwear modification, and graded return to activity.

Early intervention is preferable. If untreated, repeated sudden loading of a sensitised plantar fascia may perpetuate the pain cycle, alter gait, and make symptoms more persistent. A structured programme addressing tissue capacity, calf flexibility, foot strength, load management, and footwear is generally more effective than passive treatment alone.

Post-static dyskinesia is a hallmark clinical feature of plantar heel pain, particularly plantar fasciopathy. It arises when a shortened, stiff, or sensitised plantar fascia is abruptly loaded during the first steps after rest. Recognising this pattern assists diagnosis, guides examination, and informs conservative management aimed at reducing initial tensile strain, improving tissue tolerance, and restoring comfortable gait.

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The Anatomy of the Peroneal Muscles

The peroneal muscles—more precisely termed the fibularis muscles—form the lateral compartment of the leg and are central to foot eversion, ankle stability, and dynamic balance. The principal muscles are fibularis longus and fibularis brevis, both innervated by the superficial fibular nerve and both passing behind the lateral malleolus before inserting in the foot.

Compartmental Location

The lateral compartment lies between the anterior crural intermuscular septum anteriorly and the posterior crural intermuscular septum posteriorly. It contains fibularis longus superficially and fibularis brevis deep to it, with the superficial fibular nerve descending between fibularis longus and extensor digitorum longus.

This compartment is functionally distinct from the anterior compartment, which principally dorsiflexes the foot, and from the superficial posterior compartment, which plantarflexes it. The peroneal muscles contribute to plantarflexion as a secondary action, but their defining action is eversion.

Fibularis Longus

Fibularis longus is the larger and more proximal of the two peroneal muscles. It originates from the head and proximal two-thirds of the lateral fibular shaft, together with adjacent intermuscular septa and deep fascia.

Its muscle belly descends the lateral leg and becomes tendinous in the distal half of the leg. The tendon passes posterior to the lateral malleolus, where it lies posterior to the fibularis brevis tendon, then turns inferiorly and anteriorly across the lateral foot.

A distinctive feature of fibularis longus is its long plantar course. The tendon enters the sole, passes through a fibro-osseous tunnel beneath the cuboid formed with the long plantar ligament, and crosses obliquely across the plantar surface of the foot. It inserts on the plantar base of the first metatarsal and the adjacent medial cuneiform.

This plantar route gives fibularis longus a unique biomechanical role. By pulling the first ray downward and medially, it plantarflexes the first ray, stabilises the medial column during stance, and helps maintain the transverse and longitudinal arches of the foot.

Fibularis Brevis

Fibularis brevis is shorter and lies deep and anterior to fibularis longus. It arises from the distal two-thirds of the lateral fibular surface and the adjacent intermuscular septa.

Its tendon forms proximal to the ankle and passes behind the lateral malleolus anterior to the fibularis longus tendon. Unlike fibularis longus, it does not enter the sole; instead, it crosses the lateral aspect of the foot to insert on the tuberosity at the base of the fifth metatarsal.

Because its insertion is directly lateral, fibularis brevis acts as a direct evertor of the foot. It is often regarded as the dominant evertor, contributing a large proportion of total eversion force, while also assisting plantarflexion

Tendon Course and Retinacula

Both peroneal tendons share a similar proximal course behind the lateral malleolus, where they are retained by the superior peroneal retinaculum. This retinaculum extends from the distal fibula toward the calcaneus and Achilles region, preventing tendon displacement from the retro-malleolar groove.

Distal to this, the inferior peroneal retinaculum binds the tendons against the lateral calcaneus. Proximally the tendons share a common synovial sheath beneath the superior retinaculum; more distally, they are enclosed in separate sheaths.

At the peroneal tubercle of the calcaneus, the tendons separate: fibularis brevis passes above the tubercle toward the fifth metatarsal, while fibularis longus passes below it and continues into the plantar foot. The fibularis longus tendon is then guided through the cuboid tunnel before reaching its medial forefoot insertion.

Innervation and Blood Supply

Both fibularis longus and fibularis brevis receive motor innervation from the superficial fibular nerve, with segmental contributions commonly described as L5 and S1. The superficial fibular nerve arises from the common fibular nerve at the fibular neck and descends within the lateral compartment.

The arterial supply is derived from branches of the anterior tibial and fibular arteries. This vascular arrangement reflects the compartment’s position between the anterior and posterior leg compartments.

Functional Anatomy

The primary action of both muscles is eversion, lifting the lateral border of the foot and lowering the medial border. They also assist plantarflexion, particularly because their tendons pass posterior to the ankle’s axis of rotation

Their most important clinical function is dynamic lateral ankle stabilisation. During walking and running, rapid eccentric contraction of the peroneals resists sudden inversion, protecting the lateral ligament complex after an unexpected perturbation. This is why peroneal weakness or delayed reaction is commonly associated with recurrent inversion ankle sprains.

Fibularis longus has an additional forefoot-specific role. Its pull on the first metatarsal and medial cuneiform helps oppose the dorsiflexion-inversion effect of tibialis anterior on the medial ray, contributing to balanced load distribution across the forefoot.

Clinical Relevance

The anatomy of the peroneal muscles explains several common disorders. The tendons’ retro-malleolar course and retention by the superior retinaculum make them vulnerable to tenosynovitis, tendinopathy, and dislocation, particularly after ankle trauma or in activities involving repeated eversion and plantarflexion.

The fibularis brevis insertion at the fifth metatarsal base is clinically important because traction forces here can contribute to avulsion injury following an inversion sprain. Conversely, fibularis longus pathology may affect first-ray loading and contribute to forefoot pain or instability because of its plantar insertion.[pmc.ncbi.nlm.nih][sciencedirect]

Finally, lesions of the common fibular nerve at the fibular neck can denervate the lateral compartment, producing weakness of eversion and a characteristic vulnerability to inversion injuries. Understanding the peroneal muscles therefore requires integrating their osseous attachments, tendon pathways, nerve supply, and functional role in gait.

The peroneal muscles are anatomically compact but functionally significant. Fibularis longus and fibularis brevis originate from the fibula, pass behind the lateral malleolus, and insert on opposite sides of the foot—the longus medially on the first ray and the brevis laterally on the fifth metatarsal. This arrangement enables powerful eversion, assists plantarflexion, stabilises the ankle, and supports the arches. Their tendon anatomy also explains their susceptibility to overuse and traumatic disorders, making them essential structures in both biomechanical assessment and clinical management of lateral ankle and foot pain.

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How Parkinson’s Disease Can Affect Foot Care

Parkinson’s disease (PD) is a progressive neurological disorder that affects movement, muscle tone, balance and coordination. Although its most recognised symptoms include tremor, rigidity and slowness of movement, the disease can have a substantial impact on foot health and the ability to perform routine foot care. Changes in gait, reduced dexterity, dystonia, swelling, altered sensation and difficulty managing footwear may increase the risk of pain, skin injury and falls. Effective foot care should therefore be regarded as an important component of multidisciplinary Parkinson’s management rather than as a minor hygiene issue.

Effects on gait and foot function

Parkinson’s disease commonly alters the normal walking cycle. People may develop shorter steps, shuffling, reduced foot clearance and difficulty initiating movement. Some experience “freezing of gait”, in which the feet appear to become temporarily stuck to the floor, particularly when turning, approaching a doorway or moving in a confined space. Festination may also occur, with increasingly rapid but short steps as the person’s centre of mass moves forward. These changes reduce stability and increase the likelihood of catching the toes on rugs, thresholds or uneven ground. Foot-health problems can further worsen postural instability and walking difficulty, creating a cycle in which painful or poorly functioning feet increase fall risk.

Rigidity may restrict movement at the ankle and foot. A person may have difficulty achieving normal heel strike, ankle dorsiflexion and toe-off, and may instead walk with a flat-footed or forefoot-loading pattern. Reduced ankle movement can increase pressure beneath the forefoot or heel and may contribute to callus formation. Stiffness in the calf and ankle can also make a heel-to-toe pattern difficult to maintain. Consequently, routine walking may cause fatigue, discomfort and compensatory loading elsewhere in the lower limb.

Dystonia, deformity and pressure

Some people with Parkinson’s develop foot dystonia, an involuntary and often painful muscle contraction. The toes may curl underneath, the great toe may extend, or the foot may turn inward. The ankle can adopt an inverted or equinovarus position, causing pressure on areas that would not normally bear substantial load. Dystonia may be more pronounced during walking or at particular times in relation to medication. It can make the foot difficult to place inside a shoe and may produce pressure over the dorsum, sides or tips of the toes.

Persistent abnormal postures may contribute to claw or hammer toes, contractures and focal areas of callus. A shoe that previously fitted comfortably may become restrictive as the position of the toes or ankle changes. Pressure from footwear can result in blisters, corns, nail trauma or breaks in the skin. Where circulation, sensation or general health is compromised, even a small lesion may take longer to resolve. Foot deformity can also increase pain and further disturb gait, making mobility and balance more difficult.

Difficulty with self-care

Bradykinesia, tremor, rigidity and impaired coordination can make ordinary foot-care tasks challenging. Cutting toenails requires adequate hip and spinal mobility, visual control, hand strength and precision. A person with Parkinson’s may struggle to reach the feet, hold nail clippers steadily or judge how much nail to remove. This creates risks of cutting the skin, leaving sharp nail edges or cutting too deeply at the corners, which can contribute to ingrown nails.

Applying moisturiser, checking the soles and removing hard skin can also be difficult. Some individuals may not notice a blister, fissure or area of redness until it becomes painful or infected. Reduced activity, fatigue, cognitive changes or depression may further reduce motivation to maintain regular foot inspection. For these reasons, assistance from a family member, carer, podiatrist or other health professional may be necessary. Regular professional care is particularly valuable when self-treatment is unsafe or when there is a history of recurrent lesions.

Skin, circulation and swelling

Reduced mobility can contribute to dependent swelling in the feet, ankles and lower legs. Oedema may make shoes tighter and increase friction against the skin. It may also fluctuate during the day, meaning that footwear comfortable in the morning becomes restrictive later. Elevating the legs when appropriate, maintaining safe levels of movement and obtaining medical assessment for persistent or asymmetrical swelling may help identify contributing factors.

Dry skin and fissures are additional concerns. Feet should generally be washed in warm, not hot, water and dried carefully, especially between the toes. Harsh soaps and prolonged soaking can remove natural oils and worsen dryness. A suitable emollient may be applied to dry skin, but it should not be placed between the toes if moisture retention increases the risk of maceration. Any cut, burn, ulcer, unexplained colour change, discharge, odour or rapidly increasing swelling warrants prompt clinical assessment.

Footwear and fall prevention

Appropriate footwear is central to foot care in Parkinson’s disease. Shoes should fit the current shape of the feet, provide adequate toe space and avoid pressure over prominent areas or dystonic toes. A firm heel counter, a secure fastening system and a stable, non-slip sole may improve security during walking. Velcro or elastic closures can be easier to manage than laces when dexterity is limited. Slippers, loose backless shoes and walking barefoot may increase the risk of slipping or losing balance.

Footwear should be checked regularly because changes in deformity, swelling and gait may alter its suitability. Insoles or orthoses may be considered where there is a specific mechanical problem, although they require individual assessment. Evidence regarding orthoses and specialised footwear in Parkinson’s disease remains variable, and devices should be introduced cautiously so that they do not destabilise the person or interfere with foot placement.

Multidisciplinary management

Foot care is most effective when integrated into broader Parkinson’s management. A podiatrist can assess skin and nail health, pressure distribution, deformity, footwear and the need for professional treatment. A physiotherapist can address strength, balance, gait retraining and cueing strategies for freezing. An occupational therapist may recommend equipment or environmental adaptations that make bathing, dressing and nail care safer. The neurologist or prescribing clinician should review motor fluctuations, medication timing and painful dystonia when these affect foot function.

Education should include daily visual inspection, safe nail-care practices, appropriate footwear and advice about fall hazards within the home. Foot care plans should be reviewed as Parkinson’s disease progresses because symptoms, medication effects and mobility can change over time.

Parkinson’s disease can affect foot care through altered gait, rigidity, dystonia, deformity, swelling, reduced dexterity and increased fall risk. These problems may cause calluses, corns, nail trauma, pain, skin breakdown and difficulty wearing shoes. Regular inspection, safe hygiene, professional nail and skin care, appropriate footwear and coordinated multidisciplinary management can help preserve mobility and independence. In clinical practice, early recognition of foot problems is important because improving foot comfort and stability may reduce avoidable disability and support safer walking for people living with Parkinson’s disease.

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The Use of Podiatry Felt to Treat Foot Problems

Podiatry felt is a simple but versatile material used by podiatrists to reduce pressure, friction and shear on vulnerable areas of the foot. It is commonly applied as a temporary intervention for corns, calluses, blisters, metatarsalgia, plantar ulcers and painful bony prominences. Although felt does not correct the underlying structural or biomechanical cause of most foot problems, it can provide rapid symptom relief and create more favourable conditions for tissue recovery. Its main therapeutic action is mechanical offloading: pressure is redistributed away from a painful or injured area towards tissues that can tolerate load more effectively.

Properties and mechanism of action

Podiatry felt is generally manufactured from compressed wool, synthetic fibres or felted foam. It is available in different thicknesses, densities and adhesive forms, allowing the clinician to select a material according to the patient’s footwear, skin condition and required degree of pressure reduction. Adhesive felt is often cut into a specific shape and applied directly to the skin or to an insole.

The central principle of felt therapy is to alter the distribution of plantar load. A pad may be placed around, rather than directly over, a lesion. For example, a “donut” or aperture pad surrounding a corn removes direct pressure from the centre of the lesion while transferring some load to the surrounding skin. Similarly, a U-shaped or horseshoe-shaped pad can be used around a metatarsal head, ulcer or prominent bony area. Increasing the contact area between the foot and the shoe or insole can reduce peak pressure at the affected site.

Research supports this mechanical effect. In people with diabetic neuropathic ulceration, newly applied felt reduced peak plantar pressure by approximately 49% compared with no padding, while worn felt reduced pressure by approximately 32%. Felt also increased the contact area beneath the foot. However, the reduction in effectiveness with wear demonstrates that felt must be monitored and replaced regularly.[pubmed.ncbi.nlm.nih]

Treatment of corns and calluses

Corns and calluses develop in response to repeated pressure and friction. A corn is usually a more focal, cone-shaped area of hyperkeratosis, whereas a callus is broader and more diffuse. Both conditions may be associated with digital deformity, prominent metatarsal heads, limited joint motion, inappropriate footwear or altered gait mechanics.

Podiatry felt is often used after the lesion has been assessed and, where appropriate, reduced by scalpel debridement. A felt aperture pad can then be applied to prevent the recently treated area from immediately receiving the same mechanical stress. This approach may reduce pain during walking and allow the skin to recover. Felt can also be used over a pressure-prone area before a definitive device, such as a custom foot orthosis, is manufactured.

Its benefit is usually temporary. If a patient has a recurrent corn caused by a rigid hammertoe, for example, felt may protect the toe but will not correct the deformity. Long-term management may require footwear modification, digital orthoses, accommodative insoles, regular podiatric care or, in selected cases, surgical review. Felt should therefore be regarded as an adjunct rather than a complete treatment.

Blisters, friction and bony prominences

Felt is also useful in the management of friction-related lesions. A carefully shaped pad can reduce contact between the skin and footwear, particularly around the heel counter, malleoli, dorsum of the toes and prominent bunions. By creating a small space around the affected region, the pad can reduce rubbing and protect fragile or recently damaged skin.

In post-operative or post-traumatic care, felt may protect an incision, swelling or bony prominence from pressure generated by a surgical shoe, cast or brace. The edges should be tapered or bevelled so that the material does not produce a secondary ridge of pressure. The application must be checked carefully, because a pad that is too thick or poorly positioned may create a new pressure point elsewhere.

Patients should be advised to monitor for redness, blistering, increased pain or skin irritation. This is particularly important when adhesive materials are used, because some individuals may react to the adhesive layer. Felt may also become compressed, displaced or saturated with perspiration, reducing its effectiveness.

Metatarsalgia and plantar forefoot pain

Metatarsalgia refers to pain beneath the forefoot, commonly around the metatarsal heads. It can arise from excessive plantar loading, reduced cushioning, hallux valgus, a plantar-flexed metatarsal, a stiff ankle, high-heeled footwear or altered gait. A metatarsal pad made from felt is usually positioned proximal to the painful metatarsal heads rather than directly beneath them.

Correct placement is essential. If the pad is placed too far forward, it may increase pressure under the metatarsal heads; if it is too far posteriorly, it may provide little benefit. The podiatrist should assess the patient in standing and walking, consider footwear constraints and evaluate whether the pad improves symptoms without creating new discomfort. Pressure measurement may be useful when available, particularly in complex or high-risk cases.

Studies examining different felt designs suggest that pad geometry influences both the magnitude and duration of offloading. In one preliminary study, a 5-mm U-shaped design produced a more sustained reduction in pressure than a C-shaped design over a three-day period in healthy participants. These findings support the importance of individualised design rather than assuming that one shape is suitable for every patient.[mdpi]

Diabetic and neuropathic feet

One of the most important applications of felt is the offloading of diabetic foot ulcers and other neuropathic lesions. Neuropathy may reduce protective sensation, meaning that a patient can continue walking on an area of excessive pressure without recognising injury. Felt can be applied around an ulcer to reduce local loading while a broader treatment plan is implemented.

Evidence indicates that felted foam can be an effective alternative or adjunct to conventional offloading in selected neuropathic ulcers. One study reported substantial wound-area reduction over ten weeks and concluded that felted foam was comparable to conventional treatment in the observed group. Nevertheless, felt should not be considered sufficient treatment for every diabetic ulcer.[pubmed.ncbi.nlm.nih]

A diabetic foot assessment must include wound classification, infection screening, vascular assessment, neurological testing, footwear review and consideration of the patient’s capacity to comply with offloading. In an infected, ischaemic, deep or rapidly deteriorating ulcer, urgent multidisciplinary care is required. Felt may also conceal wound deterioration if it is left in place too long. Regular review is therefore essential, and high-risk patients should not apply or modify offloading materials without professional supervision.

Limitations and clinical precautions

The main limitation of podiatry felt is that its effect is generally short term. Compression, moisture, migration and repeated loading can reduce its cushioning and offloading properties. It may also increase pressure at the margins or at other parts of the foot if it is incorrectly designed. Adhesive reactions, maceration and skin tears are additional risks.

Felt is unsuitable as a substitute for diagnosis. Persistent pain, recurrent ulceration, unexplained swelling, colour change or loss of function may indicate a condition requiring further investigation. It is also important to distinguish between symptom reduction and resolution of the underlying cause. A patient may feel better while the biomechanical abnormality remains unchanged.

Podiatry felt remains a valuable low-cost intervention because it can rapidly redistribute pressure and reduce friction without requiring complex equipment. It has practical applications in the management of corns, calluses, blisters, metatarsalgia, bony prominences and selected diabetic foot ulcers. Its success depends on accurate assessment, appropriate pad design, correct placement and regular review.

The strongest role for felt is as a temporary or adjunctive treatment. It can protect tissue while a wound heals, provide immediate comfort after debridement and help determine whether mechanical offloading is likely to benefit a patient. However, lasting improvement usually requires treatment of the underlying cause through footwear modification, orthotic therapy, wound care, gait management or multidisciplinary intervention. Used judiciously, podiatry felt illustrates how a simple mechanical device can make a meaningful contribution to modern foot care.

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Using the PediRoller in Foot Care

The PediRoller is a small, ridged foot-rolling device designed to provide self-massage and stretching to the plantar surface of the foot. It is commonly used for temporary relief of heel and arch discomfort, tired feet, and symptoms associated with plantar heel pain or plantar fasciitis. Used appropriately, it may be a useful adjunct to a broader management programme, although it should not be regarded as a stand-alone treatment for every cause of foot pain. The manufacturer recommends rolling the foot from the heel towards the arch for approximately three to five minutes, twice daily.

Purpose and mechanism

The plantar fascia is a strong band of connective tissue extending from the calcaneal tuberosity towards the forefoot. It contributes to the maintenance of the medial longitudinal arch and assists with efficient force transmission during walking and running. When the plantar tissues are overloaded, patients may develop localised heel pain, arch discomfort, or stiffness during the first steps after rest.

The PediRoller acts through two principal mechanisms. First, the ridged surface produces a form of mechanical massage as the foot is rolled over it. This may reduce the subjective sensation of muscular tension and provide short-term analgesic relief through sensory stimulation. Second, the repeated movement places gentle pressure through the plantar soft tissues and may temporarily improve their tolerance to loading and perceived flexibility. Commercial information describes the device as helping to stretch the plantar fascia and massage tired feet, although claims of improved circulation or tissue healing should be interpreted cautiously.

The device may also be chilled or frozen before use. Cooling can provide a counter-irritant effect and may be soothing when symptoms are irritable after activity. However, cold application should be controlled carefully. A frozen device should not remain stationary against the skin, because prolonged local cooling may cause discomfort or cold injury. Continuous movement and an appropriate protective layer are sensible precautions, particularly in people with reduced sensation.

Preparation for use

Before using the PediRoller, the patient should inspect the plantar skin for cuts, blisters, fissures, ulceration, bruising, or signs of infection. The roller should be clean, intact, and placed on a stable floor. A seated position is generally preferable initially because it allows the patient to regulate pressure and reduces the risk of excessive loading.

The patient can begin with the device at room temperature. If a cold application is desired, the roller may be chilled or frozen according to the product instructions. It should be wiped dry before use to prevent slipping. Patients should avoid applying excessive force in an attempt to obtain faster results. The objective is controlled, tolerable pressure rather than aggressive treatment.

The foot should be placed over the roller with the roller positioned beneath the plantar surface. The patient then moves the foot slowly backwards and forwards, generally from the heel towards the arch and forefoot. Some product guidance recommends a continuous movement from the heel to the ball of the foot, while other instructions focus primarily on the heel-to-arch region. The most appropriate range should be determined by symptoms: painful areas may be approached gently, but the patient should not repeatedly provoke sharp or escalating pain.

Recommended technique

A practical introductory programme is three to five minutes per foot, once or twice daily. Many patients find it convenient to use the PediRoller before their first steps in the morning, after prolonged sitting, or following activity. Morning use may be particularly attractive for individuals who experience pronounced first-step pain, although the roller should not replace a structured stretching and strengthening programme.

The movement should be slow and rhythmic. Pressure can initially be supplied mainly by the weight of the leg, with progression towards partial standing only if the patient can tolerate it without symptom exacerbation. A useful pain-monitoring approach is to maintain discomfort at a mild, acceptable level and to assess the response later that day and the following morning. If symptoms become substantially worse, the duration or pressure should be reduced.

The device should not be used by repeatedly pivoting on one painful point. Instead, the foot should move across the roller so that pressure is distributed through the plantar tissues. The patient may also vary the position slightly to address the medial arch, central plantar region, and forefoot, provided that this does not reproduce neurological symptoms or intense local pain.

Clinical role and limitations

The PediRoller is best considered a symptom-modifying intervention. It may help a patient feel more comfortable and may improve short-term tolerance of walking or exercise. It is unlikely, by itself, to correct contributing factors such as sudden increases in running volume, reduced calf flexibility, weakness of the intrinsic foot muscles, inappropriate footwear, impaired load management, or proximal biomechanical deficits.

For plantar heel pain, rolling may therefore be combined with education, activity modification, supportive footwear, calf and plantar fascia stretching, progressive strengthening, and—in selected cases—taping, orthoses, or other interventions. The appropriate programme depends on the diagnosis. Heel pain can arise from conditions other than plantar fasciitis, including calcaneal stress injury, nerve irritation, fat-pad disorders, inflammatory arthropathy, tendinopathy, or referred pain. Persistent or atypical symptoms should prompt clinical assessment rather than prolonged unsupervised rolling.

The evidence for self-massage and rolling is more supportive of short-term symptom relief than of a definitive cure. Consequently, clinicians should explain that improvement may be gradual and that treatment should be guided by function, irritability, and response to loading. A patient who experiences temporary relief but continues to overload the foot may obtain only limited long-term benefit.

Safety considerations

People with diabetes, peripheral neuropathy, peripheral arterial disease, significant circulatory impairment, or reduced protective sensation should seek professional advice before using the device. The product guidance specifically advises caution for people with diabetes or circulatory disorders and states that it should not be used on broken skin. Patients with these conditions may not accurately perceive excessive pressure, cold injury, or tissue damage.

Use should also be avoided over acute wounds, infection, marked swelling of unknown cause, or severe bruising. A clinician should assess symptoms that are associated with numbness, burning, weakness, night pain, unexplained swelling, systemic illness, or an inability to bear weight. If rolling causes increasing pain, skin irritation, bruising, or symptoms that persist after use, it should be discontinued and reviewed.

After use, the roller can generally be cleaned with warm soapy water and dried thoroughly. Hygiene is particularly important when the device is shared or used in a clinical setting. Patients should receive clear instructions on pressure, duration, cold application, and warning signs rather than being told simply to “roll the foot.”

The PediRoller offers a convenient method of self-massage for people with tired feet, arch discomfort, and some forms of plantar heel pain. Its ridged surface and rolling action may reduce perceived tension and provide short-term comfort, while optional cooling may be soothing during an irritable episode. The recommended technique is slow, controlled rolling beneath the foot for approximately three to five minutes, usually twice daily.

Its greatest value is as an adjunct to comprehensive care. Effective management should address diagnosis, tissue loading, footwear, strength, flexibility, and patient-specific risk factors. Used within those limits—and with appropriate precautions—the PediRoller can be a simple, inexpensive tool that helps patients participate actively in their foot-care programme.

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Puma Running Shoes: Technology, Performance and Clinical Considerations

Puma has developed from a traditional sportswear brand into a significant competitor in the modern performance-running market. Its contemporary running shoes are centred on the NITROFOAM™ cushioning platform, PWRPLATE propulsion technology and PUMAGRIP outsole compound. Together, these features are intended to provide a combination of lightweight cushioning, energy return, stability and traction. However, as with all running footwear, the suitability of a Puma shoe depends less on brand reputation than on the interaction between the shoe, the runner’s biomechanics, training demands and personal comfort.

Development of Puma Running Shoes

Puma has a long history of footwear innovation. In 1985, the company introduced its Running System collection, which used a Multiplex IV midsole incorporating several materials with different physical and chemical properties. The objective was to absorb shock while controlling motion. Earlier technologies such as TRINOMIC, introduced in 1990, used a hexagonal structure designed to compress and rebound under load. These developments established a foundation for Puma’s current emphasis on cushioning and mechanical efficiency.

The most important recent development has been NITROFOAM™, a nitrogen-infused foam designed to reduce weight while maintaining cushioning and responsiveness. Puma describes the material as lightweight, high-rebound and capable of reducing energy loss during movement. NITROFOAM™ Elite represents the company’s premium formulation and is used in its highest-performance racing models.

Puma’s current range is broad. It includes neutral daily trainers, lightweight tempo shoes, trail footwear and carbon-plated racing models. The Velocity NITRO, for example, is positioned as a versatile daily trainer, while the Deviate NITRO series combines cushioning with a propulsion plate for faster training. The Fast-R NITRO Elite and Deviate NITRO Elite are designed primarily for racing and high-level performance.

Midsole Technology and Ride Characteristics

The central performance feature of Puma’s modern shoes is the NITROFOAM™ midsole. During running, the midsole compresses under load and subsequently rebounds as the runner progresses through midstance and toe-off. In practical terms, the foam is intended to provide a soft enough landing without feeling excessively slow or unstable. The balance between compliance and resilience is particularly important because runners often want cushioning for comfort but also a responsive sensation during faster running.

Different Puma models use different amounts and formulations of foam. Daily trainers generally provide a more balanced ride, making them appropriate for easy runs, regular mileage and recreational training. Racing shoes use lighter, more energetic foam and may include increased stack height. NITROFOAM™ Elite is intended to deliver greater responsiveness in a lighter package than conventional foams. However, a highly energetic midsole is not automatically superior for every runner. Some individuals may prefer a firmer and more stable platform, particularly when walking, running slowly or negotiating uneven surfaces.

The Deviate NITRO series adds PWRPLATE, a carbon-fibre or carbon-composite plate embedded within the midsole. Puma describes PWRPLATE as a component that stabilises the midsole and maximises energy transfer. The plate increases longitudinal stiffness and can help create a rolling sensation through late stance. This may be advantageous during tempo runs and racing, when the runner is applying greater force and moving at higher speeds.

Nevertheless, plated shoes alter the mechanical demands placed on the lower limb. A stiff forefoot may reduce motion at the metatarsophalangeal joints while changing ankle, calf and plantar-flexor loading. Some runners adapt easily, whereas others may experience increased calf, Achilles tendon or forefoot stress when introducing plated footwear too rapidly. For this reason, carbon-plated Puma models should generally be incorporated progressively rather than used immediately for all training sessions.

Outsole, Upper and Fit

Puma uses PUMAGRIP rubber across many of its performance models. The outsole is designed to provide traction on roads and other surfaces, which is particularly important in wet conditions, during cornering and when the runner is fatigued. Reliable grip can improve confidence and reduce unwanted slipping, although outsole durability will vary according to body mass, running technique, surface and weekly mileage.

The uppers commonly use engineered mesh to provide breathability and reduce weight. Targeted PWRTAPE reinforcement is incorporated in selected shoes to improve upper structure and help secure the foot. A well-designed upper should hold the heel and midfoot without excessive pressure, while allowing adequate room for toe splay. Fit is clinically relevant because excessive compression may contribute to discomfort, blistering or nail trauma, whereas excessive internal movement can increase shear forces.

Puma shoes can have a relatively performance-oriented shape, especially in racing models. Therefore, runners with a broad forefoot, hallux limitus, prominent digital deformities or significant oedema should assess width and upper volume carefully. A shoe that appears technically advanced may still be unsuitable if it fails to accommodate the individual foot.

Biomechanical and Clinical Considerations

Running footwear influences lower-limb mechanics, including joint motion, loading rates, ground-reaction forces and muscle activity. However, current evidence does not establish that a particular shoe brand or construction reliably prevents running-related injury. A recent narrative review concluded that although different shoes produce different biomechanical effects, clinically meaningful evidence linking footwear characteristics to injury prevention remains limited. It supports an individualised, comfort-guided approach to shoe selection.

This principle is important when evaluating Puma running shoes. A neutral shoe may suit a runner whose symptoms are not associated with excessive motion or who prefers unrestricted foot movement. A more structured model may feel more secure for a runner seeking additional guidance, although it should not be regarded as a substitute for a full clinical assessment. Likewise, a high-stack or carbon-plated shoe may improve comfort and performance for one athlete but feel unstable or overly aggressive for another.

Puma shoes may be appropriate for runners with a variety of needs, but selection should consider training pace, surface, running volume, foot shape, previous injury and tolerance to changes in footwear. Clinicians should also examine the entire management plan, including load progression, strength, recovery, technique and relevant medical factors. Shoe choice is one component of injury management rather than an isolated treatment.

Advantages and Limitations

The major advantages of Puma’s running range are its modern foam technology, competitive performance features and broad model selection. NITROFOAM™ provides a lightweight and responsive platform, while PWRPLATE offers a propulsion-focused option for runners seeking faster training or racing performance. PUMAGRIP can also provide dependable traction across a range of conditions. Puma’s elite models demonstrate that the company is capable of competing technologically with established premium running brands.

There are also limitations. Some plated models may be costly and may not provide meaningful benefits for runners who primarily run at easy speeds. Highly responsive shoes can feel less stable to individuals who prioritise controlled, predictable motion. Durability may vary between models, and the marketing language surrounding energy return or efficiency should not be interpreted as proof of injury prevention. Finally, a shoe’s success depends heavily on fit and individual preference, both of which cannot be determined from specifications alone.

Conclusion

Puma running shoes represent an important development in contemporary footwear, particularly through the use of NITROFOAM™, NITROFOAM™ Elite, PWRPLATE and PUMAGRIP. The range offers practical options for daily training as well as advanced shoes for tempo running and competition. Their design may enhance comfort, responsiveness and propulsion, but these benefits are highly individual.

For runners and clinicians, the most appropriate Puma shoe is the one that fits well, feels comfortable, matches the intended training purpose and can be introduced without excessive changes in loading. Current evidence does not justify claiming that Puma—or any other brand—prevents injury. Instead, Puma running shoes should be viewed as tools that can support performance and comfort when selected within an individualised, evidence-informed approach.

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Psoriasis affecting the feet

Psoriasis affecting the feet represents a clinically significant subset of psoriatic disease that poses unique diagnostic and therapeutic challenges for podiatric practitioners. This chronic inflammatory dermatosis can manifest as palmoplantar psoriasis, characterised by hyperkeratotic plaques on the plantar surface, or as part of the broader spectrum of psoriatic arthritis with enthesitis and dactylitis affecting foot structures. Understanding the pathophysiology, clinical presentation, and evidence-based management strategies is essential for optimising patient outcomes and minimising functional disability.

Pathophysiology and Epidemiology

Palmoplantar psoriasis affects approximately 12–16% of individuals living with psoriasis, representing a substantial patient population in clinical practice. The condition arises from dysregulated immune responses involving T-cell activation and pro-inflammatory cytokines, particularly interleukin-17 and interleukin-23, which drive keratinocyte hyperproliferation and abnormal differentiation. When localised to the feet, the thick stratum corneum of the plantar skin contributes to the characteristic hyperkeratotic morphology and resistance to conventional therapies.

Palmoplantar pustulosis, historically considered a variant of palmoplantar psoriasis, presents with sterile intraepidermal pustules and may represent a distinct entity, though the classification remains debated in dermatological literature. Both conditions are chronic, relapsing disorders associated with significant impairment in quality of life due to pain, fissuring, and functional limitations during ambulation.

Clinical Presentation

Cutaneous Manifestations

Plantar psoriasis classically presents as bilateral, symmetrical, well-demarcated erythematous plaques with sharp borders extending across the soles. The overlying scale is typically thick and may exhibit a silvery appearance, though on darker skin tones the plaques may appear greyish or hyperpigmented. Deep fissuring is a hallmark feature, often causing severe pain and bleeding that significantly impairs mobility and weight-bearing activities.

In palmoplantar pustulosis, the initial presentation involves crops of small, sterile pustules that evolve from yellow to brown before becoming scaly and desquamating. These pustules may coalesce into larger lesions up to 5 cm in diameter, particularly on weight-bearing areas such as the heels and medial arch. Patients frequently report symptoms of itching, burning, and pain, with fissuring contributing to secondary infection risk.

Nail Involvement

Nail psoriasis commonly coexists with plantar disease, affecting the toenails with characteristic findings including pitting, onycholysis, subungual hyperkeratosis, and oil-drop discoloration. Nail involvement serves as a clinical marker for increased risk of psoriatic arthritis and should prompt careful musculoskeletal assessment.

Psoriatic Arthritis of the Foot

Psoriatic arthritis (PsA) affects the foot in a substantial proportion of patients, with enthesitis representing the hallmark finding. The most common sites include the Achilles tendon insertion at the calcaneus and the plantar fascia origin at the medial calcaneal tubercle. Synovial inflammation leads to joint swelling, tenderness, stiffness (particularly morning stiffness), and reduced range of motion

Dactylitis, or “sausage toe,” results from diffuse inflammation of an entire digit and is highly specific for psoriatic disease. Chronic PsA can produce structural deformities including clawing or shortening of toes, hyperextension of the hallux, and collapse of the metatarsal arch with associated hindfoot valgus. These biomechanical alterations increase plantar pressures and predispose to secondary complications such as metatarsalgia and ulceration, particularly in patients with comorbid diabetes or peripheral neuropathy.

Differential Diagnosis

The differential diagnosis of plantar dermatoses is broad and includes tinea pedis, contact dermatitis, dyshidrotic eczema, and juvenile plantar dermatosis. Tinea pedis typically presents with interdigital scaling and may be distinguished by potassium hydroxide preparation demonstrating fungal hyphae. Contact dermatitis often shows a more acute presentation with vesiculation and a history of allergen exposure.

Given the morphological overlap, skin biopsy may be necessary to confirm the diagnosis, particularly in atypical presentations or when initial therapy fails. Histopathological examination reveals acanthosis, parakeratosis, neutrophilic infiltration of the stratum corneum (Munro microabscesses), and dilated capillaries in the dermal papillae.

Diagnostic Approach

Diagnosis is primarily clinical, based on the characteristic appearance, distribution, and patient history. Key diagnostic features include symmetrical involvement, well-demarcated plaques, nail changes, and personal or family history of psoriasis. When fungal infection is suspected, skin scrapings for microscopy and culture should be obtained to exclude tinea.

For patients with suspected psoriatic arthritis, referral to rheumatology is warranted for comprehensive assessment including inflammatory markers, imaging (radiography or musculoskeletal ultrasound), and consideration of disease-modifying therapy. Podiatrists play a crucial role in early recognition of enthesitis and dactylitis, facilitating timely multidisciplinary management.

Management Strategies

Topical Therapies

First-line treatment for localised plantar psoriasis includes high-potency topical corticosteroids, often under occlusion to enhance penetration through the thick plantar stratum corneum. Intermittent rather than continuous use is recommended to minimise tachyphylaxis and adverse effects. Adjunctive therapies include emollients to reduce scaling and fissuring, keratolytic agents such as urea (20–40%) or salicylic acid to soften hyperkeratosis, and coal tar preparations for anti-inflammatory and antiproliferative effects.

Topical calcipotriene (vitamin D analogue) may be used in combination with corticosteroids for enhanced efficacy, though penetration through thick plantar plaques remains challenging. For palmoplantar pustulosis, ultrapotent topical steroids are typically employed intermittently, as continuous treatment may aggravate the condition.

Phototherapy

Narrowband ultraviolet B (NB-UVB) phototherapy and psoralen plus UVA (PUVA) are effective options for widespread or recalcitrant disease. However, the thickness of plantar skin may limit light penetration, requiring higher doses or longer treatment courses.

Systemic Therapies

For moderate-to-severe disease or significant functional impairment, systemic agents are indicated. Traditional options include methotrexate, cyclosporine, and acitretin, which modulate immune responses and keratinocyte proliferation. These require careful monitoring for hepatotoxicity, nephrotoxicity, and teratogenicity.

Biologic therapies targeting tumour necrosis factor-alpha (TNF-α), interleukin-17, and interleukin-23 have demonstrated promising results for palmoplantar psoriasis, with significant improvements in plaque clearance and quality of life. Agents such as etanercept, infliximab, secukinumab, and ixekizumab are increasingly employed for refractory cases.

Podiatric and Mechanical Management

Podiatric intervention is essential for addressing biomechanical complications and optimising function. Custom orthotic devices can redistribute plantar pressures, reduce stress on inflamed entheses, and accommodate structural deformities. Supportive footwear with cushioned soles and adequate depth accommodates swollen digits and reduces shear forces.

For enthesitis-related pain, conservative measures including rest, ice, activity modification, and non-steroidal anti-inflammatory drugs provide symptomatic relief. Physical therapy focusing on stretching and strengthening exercises maintains joint mobility and muscle function. In cases of severe deformity or refractory pain, surgical interventions such as arthrodesis or joint reconstruction may be considered in coordination with orthopaedic colleagues

Multidisciplinary Care

Optimal management requires collaboration between podiatrists, dermatologists, and rheumatologists. While systemic disease is managed with disease-modifying antirheumatic drugs (DMARDs) and biologics by rheumatology, podiatrists focus on mechanical protection, footwear optimisation, wound care for fissures, and monitoring for secondary complications. Regular follow-up enables early detection of disease progression and adjustment of therapeutic strategies.

Prognosis and Quality of Life

Palmoplantar psoriasis is a chronic, relapsing condition with no definitive cure, though modern biologic therapies have improved long-term outcomes. The functional disability associated with painful fissures, altered gait, and footwear restrictions substantially impacts quality of life, employment, and psychological well-being. Early diagnosis, aggressive treatment, and comprehensive podiatric care are essential to minimise morbidity and maintain mobility.

Psoriasis affecting the feet encompasses a spectrum of cutaneous and articular manifestations requiring a nuanced, multidisciplinary approach. Recognition of characteristic clinical features, appropriate diagnostic evaluation, and implementation of evidence-based therapies—from topical agents to biologics and mechanical interventions—enable podiatrists to significantly improve patient outcomes. Ongoing research into targeted immunomodulatory therapies continues to expand the therapeutic armamentarium, offering hope for enhanced disease control and quality of life for affected individuals.

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Posterior Tibial Tendon Dysfunction

Posterior tibial tendon dysfunction (PTTD) is a progressive disorder involving failure of the tibialis posterior tendon and, frequently, the supporting ligaments and joints of the medial foot and ankle. It is a major cause of adult-acquired flatfoot and may produce pain, weakness, loss of the medial longitudinal arch, hindfoot valgus, forefoot abduction and, in advanced cases, ankle valgus. Because the deformity reflects a three-dimensional failure of the foot rather than an isolated tendon problem, the term progressive collapsing foot deformity (PCFD) is now increasingly preferred.

Anatomy and pathophysiology

The tibialis posterior muscle originates mainly from the posterior tibia, fibula and interosseous membrane. Its tendon passes behind the medial malleolus, changes direction around the ankle, and inserts primarily onto the navicular, with expansions to the cuneiforms, cuboid, metatarsal bases and sustentaculum tali. It contributes to inversion and plantarflexion and is an important dynamic stabiliser of the medial longitudinal arch.

During stance, the tendon assists in controlling pronation and helps convert the foot into a rigid lever for propulsion. Tendon degeneration, elongation or rupture reduces this support. The spring ligament, deltoid ligament, plantar fascia and other passive stabilisers may subsequently become overloaded. The result is progressive pronation, hindfoot eversion, talar plantarflexion and adduction, forefoot abduction, and collapse of the medial arch.

The condition is most common in middle-aged and older adults, particularly women, although it also occurs in athletes and younger patients. Reported risk factors include obesity, hypertension, diabetes, previous trauma, inflammatory disease and corticosteroid exposure. Mechanical overload is often compounded by reduced calf strength, impaired balance, poor proximal limb control and limited ankle dorsiflexion.

Clinical presentation

Symptoms commonly begin with pain and swelling along the posteromedial ankle, especially behind or below the medial malleolus. Patients may describe fatigue, aching during prolonged standing or walking, and difficulty walking on uneven ground. As the deformity progresses, pain may shift to the lateral hindfoot because of sinus tarsi or subfibular impingement.

Clinical assessment should compare both limbs and include standing alignment, gait, footwear, ankle range of motion, hindfoot position and the ability to perform a single-leg heel rise. Important findings include:

  • Tenderness or swelling along the tibialis posterior tendon.
  • Reduced inversion strength and pain with resisted inversion.
  • Loss or flattening of the medial longitudinal arch.
  • Hindfoot valgus and forefoot abduction.
  • The “too-many-toes” sign, reflecting lateral displacement of the forefoot when viewed from behind.
  • Difficulty or inability to perform a repeated single-leg heel raise.
  • Reduced inversion of the calcaneus during heel elevation.
  • Limited ankle dorsiflexion or gastrocnemius tightness.

The single-leg heel-rise test is particularly useful. In early disease, the patient may complete the movement but experience pain or weakness. In more advanced disease, the patient cannot elevate the heel or cannot invert the hindfoot during the maneuver. Nevertheless, clinical testing should not be interpreted in isolation, since pain, balance impairment and coexisting ankle pathology may influence performance.

Diagnosis and classification

Diagnosis is primarily clinical, supported by weight-bearing imaging when deformity is suspected. Plain radiographs should generally include weight-bearing anteroposterior, lateral and hindfoot views. They can demonstrate loss of arch height, increased talonavicular uncoverage, forefoot abduction, talar–first metatarsal malalignment and hindfoot valgus. Stress or specialist imaging may be useful when ankle instability or rigid deformity is present.

Ultrasound can assess tendon thickening, tenosynovitis, partial tears and dynamic function. Magnetic resonance imaging is valuable when the diagnosis is uncertain or when tendon, spring ligament, deltoid ligament, cartilage and occult bone pathology must be evaluated. However, imaging abnormalities should be correlated with symptoms and physical findings.

Traditional staging systems describe a continuum from painful tendon dysfunction without major deformity to flexible flatfoot and finally rigid deformity with ankle involvement. The newer PCFD classification recognises that several deformities may coexist and that flexibility is clinically important. Class A represents hindfoot valgus; class B, midfoot or forefoot abduction; class C, forefoot varus or medial-column instability; class D, peritalar subluxation or dislocation; and class E, ankle instability or valgus tilt. Each deformity may be flexible or rigid.

This framework is clinically useful because treatment should address the dominant deformity and its flexibility, rather than assuming that tendon failure follows one predictable sequence.

Conservative management

Early treatment is usually non-operative. The goals are to reduce tendon load, control deformity, restore strength and improve function. Relative rest and temporary modification of aggravating activities may be required, while complete immobilisation should generally be reserved for more painful presentations or acute exacerbations.

A short period in a walking boot or supportive brace can reduce symptoms and allow tendon irritability to settle. This should be followed by a structured rehabilitation programme rather than prolonged immobilisation. Exercise commonly includes progressive tibialis posterior and calf strengthening, eccentric or heavy-slow resistance loading, intrinsic foot exercises, balance training and proximal hip strengthening. Calf stretching may be appropriate when restricted dorsiflexion contributes to compensatory