Lisfranc fractures represent a serious midfoot injury involving disruption of the tarsometatarsal (TMT) joint complex. These injuries demand precise diagnosis and management to prevent long-term complications like chronic pain and arthritis.
Anatomy Overview
The Lisfranc joint complex spans the midfoot, linking the metatarsals (M1-M5) to the tarsals, including the medial, middle, and lateral cuneiforms plus the cuboid. Stability arises from the recessed second metatarsal base, forming a “Roman arch,” with the Lisfranc ligament anchoring the medial cuneiform to the second metatarsal base. This ligamentous and osseous architecture bears significant weight during gait, transmitting forces from the hindfoot to the forefoot.
Dorsal and plantar ligaments, along with intermetatarsal structures, reinforce the joint. The second metatarsal’s keystone position, wedged between cuneiforms, provides inherent stability, yet vulnerability persists to axial loads or twisting.
Mechanisms of Injury
High-energy trauma, such as motor vehicle accidents or falls from height, accounts for many Lisfranc fractures, often fracturing metatarsals or cuneiforms alongside dislocation. Low-energy incidents, like twisting the foot in sports (e.g., football or windsurfing), cause ligamentous sprains or subtle subluxations.
Hyperplantarflexion or direct strikes can shear the metatarsal bases, while axial loading with foot rotation disrupts the joint. In athletes, these injuries mimic ankle sprains but affect the midfoot arch. Incidence sits at about 1 in 55,000, though underdiagnosis inflates true rates.
Clinical Presentation
Patients report acute midfoot pain, swelling, and inability to bear weight, often with plantar ecchymosis across the arch—a hallmark sign from retracted dorsal vessels. Deformity may show as widened forefoot or flattened arch.
Tenderness localizes over the first or second TMT joint, worsening with pronation or passive dorsiflexion. Neuropathy can cause numbness in toes. In subtle cases, pain persists during push-off in gait, delaying recognition.
Diagnostic Imaging
Weightbearing anteroposterior (AP), lateral, and oblique radiographs reveal key signs: diastasis greater than 2 mm between the first-second metatarsal bases or “fleck” sign from avulsed Lisfranc ligament bone. Lateral views show height loss between cuneiform and metatarsal bases.journals.
Non-weightbearing films often miss instability; stress views or CT scans confirm subtle dislocations, detailing fractures and alignment. MRI excels at ligament tears, guiding surgical decisions in equivocal cases.
Classification Systems
The Hardcastle-Myles system categorizes by anatomy: Type A (total dislocation), Type B (partial, divergent or convergent), Type C (divergent with instability). Myerson refines B and C subtypes. These aid prognosis; purely ligamentous injuries fare worse than bony ones.
Quenu and Kuss predated these, but modern schemes emphasize instability over displacement
Nonoperative Management
Stable injuries without diastasis (<2 mm) or displacement suit immobilization in a non-weightbearing cast or boot for 6-8 weeks, followed by serial imaging. Partial weightbearing resumes if alignment holds, with physical therapy restoring strength and proprioception.
This approach fits extra-articular fractures or sprains confirmed stable on stress views. Success hinges on compliance; failure risks deformity.
Surgical Interventions
Unstable injuries demand operative fixation for anatomic reduction, the cornerstone of good outcomes. Open reduction internal fixation (ORIF) uses screws or plates across TMT joints, often after 10-14 days to reduce swelling.
Primary arthrodesis fuses irreparably damaged joints, especially second TMT, showing lower arthritis rates than ORIF in ligamentous cases. K-wires suffice temporarily but risk migration. Staged procedures—external fixation then ORIF—handle severe trauma.
Postoperative Care
Post-ORIF, non-weightbearing lasts 6-12 weeks in cast or boot, with screws often removed at 4 months. Therapy addresses stiffness, targeting gait normalization by 3-6 months. Full recovery spans 6-12 months, longer for athletes.
Complications like infection or hardware irritation occur in 10-20%; compartment syndrome demands vigilance.
Complications and Prognosis
Missed diagnoses lead to midfoot collapse, arthritis (up to 75% post-ORIF), and chronic pain. Post-traumatic osteoarthritis prompts salvage arthrodesis. Return to sport averages 4-6 months, with 40-80% full recovery depending on injury severity.
Risk factors include delay >6 weeks or nonanatomic reduction (>2 mm malalignment)
Rehabilitation Strategies
Phase 1 (0-6 weeks): Immobilization, elevation, edema control. Phase 2 (6-12 weeks): Protected weightbearing, range-of-motion exercises. Phase 3 (3-6 months): Strengthening, proprioception, plyometrics. Custom orthoses support the arch long-term.
Evidence favors early intervention; athletes benefit from sport-specific protocols.
Recent Advances
Dual plating reduces hardware failure versus screws alone. Arthroscopic-assisted reduction minimizes morbidity. Biomechanical studies validate primary arthrodesis for severe injuries, cutting reoperation rates.
Research stresses weightbearing CT for instability detection.