Lisfranc injuries are fracture-dislocations or ligamentous disruptions of the tarsometatarsal (TMT) joint complex of the midfoot. They are uncommon but frequently misdiagnosed — an estimated 20% are initially overlooked — and carry a high rate of long-term morbidity including chronic pain, post-traumatic arthritis, and gait dysfunction. [1-3]
1. History
- Mechanism of injury: Forceful abduction, twisting of a plantarflexed foot, or axial loading (e.g., landing from a jump, stepping off a curb, MVC with foot on brake pedal, crush injury) [1][3-4]
- High-energy: MVCs, falls from height, industrial crush injuries → typically obvious fracture-dislocations
- Low-energy: Athletic injuries (football, soccer), misstep off a curb → often subtle, purely ligamentous injuries that are easily missed [1-2]
- Symptom characterization: Midfoot pain, inability to bear weight, progressive swelling
- Timing: Acute onset with trauma; patients may present delayed if initial injury was low-energy and misdiagnosed as a "sprain"
- Ask about prior foot injuries, prior midfoot pain, and functional baseline
- Ask specifically: "Can you take a single step on the affected foot?" — inability to bear weight is a key diagnostic clue [4]
2. Alarm Features
- Compartment syndrome: Pain out of proportion, pain with passive toe stretch, tense dorsal foot swelling, paresthesias — can occur with high-energy Lisfranc injuries [1][5-6]
- Neurovascular compromise: Diminished dorsalis pedis pulse, pallor, prolonged capillary refill
- Open fracture: Skin breach over the midfoot
- Gross deformity or dislocation: Obvious malalignment of the midfoot
- Plantar ecchymosis: Pathognomonic finding — bruising on the plantar midfoot strongly suggests Lisfranc injury [1-2]
- Rapidly progressive swelling disproportionate to apparent injury severity
3. Medications
- Acute pain management:
- First-line: NSAIDs (ibuprofen 400–600 mg q6–8h or ketorolac 15–30 mg IV) ± acetaminophen 1000 mg q6h — multimodal approach recommended [7-9]
- Topical NSAIDs are effective for musculoskeletal pain with fewer systemic side effects [8]
- The Orthopaedic Trauma Association recommends routine use of NSAIDs as part of a comprehensive analgesic plan for fracture care; no conclusive clinical evidence prohibits their use in fracture healing [9]
- Short-term opioids may be needed for severe pain (e.g., displaced fracture-dislocation), but should be minimized [10]
- Contraindicated/caution: Avoid NSAIDs in renal disease, active GI bleeding, or significant cardiovascular disease [10]
- DVT prophylaxis: Consider in patients who will be non-weight-bearing and immobilized, per institutional protocol
4. Diet
- No specific dietary triggers or restrictions
- Adequate calcium and vitamin D intake to support bone healing
- Smoking cessation is critical — smoking is an independent risk factor for post-traumatic arthritis and poor outcomes [11]
- Adequate hydration and nutrition to support wound healing, especially if surgical intervention is planned
5. Review of Systems
- MSK: Pain with weight-bearing, midfoot swelling, difficulty ambulating
- Neuro: Numbness/tingling in the foot (deep peroneal nerve distribution — first web space), weakness of toe extension
- Vascular: Skin color changes, temperature changes in the foot
- Constitutional: Mechanism-related — polytrauma screening (head, spine, pelvis, other extremities) in high-energy mechanisms
- Psych: Assess for anxiety/depression, as these injuries carry significant functional morbidity and prolonged recovery
6. Collateral History and Family History
- Witnesses to mechanism (especially in sports injuries or MVCs) — exact position of the foot at time of injury
- Prior foot/ankle injuries or surgeries
- Family history is generally not contributory
- Social context: Occupation (manual labor, athlete), activity level, and functional demands are critical for treatment planning
- Psychiatric history may be relevant — associated with higher reoperation rates [12]
7. Risk Factors
- High-energy trauma: MVCs, falls from height, crush injuries [1][13]
- Athletic participation: Football, soccer, equestrian sports, ballet — axial loading or twisting through a plantarflexed foot [4]
- Low-energy missteps: Stepping off a curb, stumbling — most common mechanism overall (simple fall/tripping = 31% in a large registry) [13]
- Obesity (40% of surgical cohort in one series) [14]
- Diabetes mellitus and tobacco use — associated with worse healing and higher complication rates [11][14]
8. Differential Diagnosis
- Midfoot sprain (without instability) — most common mimic; distinguished by stability on weight-bearing radiographs
- Metatarsal base fractures — multiple metatarsal fractures should raise suspicion for concomitant Lisfranc disruption [3]
- Navicular fracture (stress or acute)
- Cuboid/cuneiform fracture
- Chopart joint injury (calcaneocuboid/talonavicular)
- Plantar fascia rupture — can cause plantar ecchymosis but without bony malalignment
- Jones fracture / proximal 5th metatarsal fracture — lateral foot pain, different mechanism
- Stress fracture of the metatarsals — insidious onset, no acute trauma
9. Past Medical History
- Prior foot/ankle injuries or surgeries
- Diabetes mellitus — neuropathy may mask pain, impaired healing [14]
- Peripheral vascular disease — affects healing and perfusion assessment
- Osteoporosis — may affect fixation quality
- Tobacco use — independent risk factor for post-traumatic arthritis [11]
- Previous episodes of midfoot pain or instability
10. Physical Exam
- Inspection: Midfoot swelling, dorsal ecchymosis, plantar ecchymosis (highly suggestive of Lisfranc injury) [1-2]
- Palpation: Point tenderness over the TMT joints (especially the 1st–2nd intermetatarsal space and the base of the 2nd metatarsal)
- Provocative maneuvers:
- Piano key test: Stabilize the hindfoot and passively dorsiflex/plantarflex individual metatarsals — pain at the TMT joint is positive
- Midfoot squeeze test: Compress the forefoot medially and laterally — pain at the midfoot is suggestive [4]
- Passive abduction/pronation stress: Reproduces pain at the Lisfranc joint
- Weight-bearing assessment: Inability to bear weight or single-leg heel raise is a key finding [4]
- Neurovascular exam: Dorsalis pedis pulse, sensation in the first web space (deep peroneal nerve), capillary refill
- Compartment assessment: Palpate for tense compartments; assess pain with passive toe extension [6]
11. Lab Studies
- Labs are generally not required for isolated Lisfranc injuries
- Pre-operative labs if surgery is anticipated: CBC, BMP, coagulation studies, type and screen (per institutional protocol)
- HbA1c in diabetic patients to assess glycemic control prior to surgery
- Inflammatory markers (ESR, CRP) if concern for infection in open injuries
12. Imaging
- First-line: AP, lateral, and oblique foot radiographs — obtain bilateral weight-bearing views when possible, as non-weight-bearing films are unreliable for detecting subtle injuries [15-17]
- Key radiographic findings (indicating instability): [3][18]
- Fleck sign: Small bony fragment between the 1st and 2nd metatarsal bases (avulsion of the Lisfranc ligament) — pathognomonic
- ≥2 mm diastasis between the medial cuneiform and 2nd metatarsal base on AP view
- Loss of alignment of the 2nd metatarsal–medial cuneiform border (AP) or 4th metatarsal–cuboid border (oblique)
- Dorsal subluxation of metatarsals on lateral view
- CT scan: Indicated when radiographs are negative but clinical suspicion remains high; superior for detecting occult fractures and subtle subluxation; also used for surgical planning in confirmed injuries [1][19-20]
- MRI: Best for evaluating ligamentous integrity (Lisfranc ligament); useful for subtle/purely ligamentous injuries when CT is equivocal [4][19][21]
- When imaging is unnecessary: If Ottawa foot rules are negative and there is no midfoot tenderness or clinical suspicion
13. Special Tests
- Bilateral weight-bearing radiographs: The single most important diagnostic study — comparison with the contralateral foot increases sensitivity for subtle diastasis [15-17]
- 3D CT reconstruction: Novel signs (Mercedes sign, peeking metatarsal sign, peeking cuneiform sign) demonstrate excellent sensitivity (92–97%) and specificity (92–93%) [20]
- Stress fluoroscopy (under anesthesia): May be performed intraoperatively to confirm instability when diagnosis remains uncertain
- Intracompartmental pressure monitoring: If compartment syndrome is suspected — a delta pressure (diastolic BP minus compartment pressure) <30 mmHg is diagnostic [5-6]
14. ECG
- Not routinely indicated for isolated Lisfranc injuries
- Obtain if the mechanism involves polytrauma, significant blood loss, or if the patient has cardiac risk factors and is being evaluated for surgery
- Consider in elderly patients or those with cardiac comorbidities prior to operative intervention
15. Assessment
- Lisfranc injuries exist on a spectrum from stable sprains to unstable fracture-dislocations [1][22]
- Stability-based classification is now preferred over anatomy-based systems (e.g., Hardcastle/Myerson) for guiding treatment: [22]
- Stable: No displacement on weight-bearing radiographs, intact ligaments on MRI → nonoperative management
- Unstable: Displacement ≥2 mm, positive fleck sign, ligament disruption → surgical intervention
- Most Lisfranc injuries are unstable and will require surgery [3]
- Complications to anticipate:
- Post-traumatic arthritis: Most common long-term complication (37% in one surgical series; radiographic OA in 72% at mean 11-year follow-up) [11][14]
- Chronic pain and gait dysfunction
- Hardware-related pain requiring removal (~19–26%) [14][23]
- Deep infection (8% in open injuries) [14]
- Risk factors for poor outcomes: nonanatomic reduction, open fracture, high-energy mechanism, smoking, Myerson type C [11][14][24]
16. Treatment Plan
Initial stabilization (ED)
- Ice, elevation, and immobilization in a well-padded posterior short-leg splint
- Strict non-weight-bearing status [1][3]
- Multimodal analgesia: acetaminophen + NSAIDs ± short-course opioids for severe pain [7][9]
- Neurovascular checks; serial compartment assessments if high-energy mechanism
Nonoperative management (stable, nondisplaced injuries only):
- Short-leg non-weight-bearing cast or boot for 4–6 weeks, followed by weight-bearing cast/boot for 2–4 weeks [3-4][22]
- Close radiographic follow-up to ensure no interval displacement
Surgical management (unstable/displaced injuries)
- ORIF (most common approach): Bridge plating is the current consensus technique; anatomical reduction is the single most important determinant of outcome [22][25-26]
- Primary arthrodesis: May offer lower rates of post-traumatic arthritis (2.8% vs 17.3%) and reoperation compared to ORIF; considered especially for comminuted injuries where joint surfaces are not salvageable [22][27]
- Suture button fixation: Emerging technique for purely ligamentous injuries; promising early results with flexible stabilization [22][28]
- Timing: Surgery ideally within 1–2 weeks; may need to wait for soft tissue swelling to subside
17. Disposition
- Admission criteria:
- Gross dislocation requiring emergent/urgent reduction
- Open fracture-dislocation
- Suspected or confirmed compartment syndrome
- Polytrauma
- Neurovascular compromise
- Inability to manage pain as an outpatient
- Discharge criteria (stable injuries or post-reduction):
- Adequate pain control
- Neurovascularly intact
- Placed in a posterior splint, strict non-weight-bearing with crutches/walker
- Orthopedic follow-up arranged within 1 week [1]
- All Lisfranc injuries should be discussed with orthopedic surgery to determine definitive management, even if the patient is being discharged [1]
18. Follow Up / Return Precautions
- Follow-up timing: Orthopedic surgery within 5–7 days of ED visit; repeat imaging at 1–2 weeks to assess for interval displacement [3]
- Return precautions — instruct patients to return immediately for:
- Increasing pain despite medications (concern for compartment syndrome)
- Numbness, tingling, or color changes in the toes
- Worsening swelling not relieved by elevation
- Fever, wound drainage, or skin breakdown
- Expected recovery:
- Non-weight-bearing for minimum 6 weeks (operative or nonoperative)
- Full recovery typically 4–6 months for stable injuries; 6–12+ months for surgical cases
- Athletes: return to sport at ~2.8 months for ligamentous injuries, ~4.5 months for bony injuries (nonoperative); longer for surgical cases [4]
- Counsel patients that post-traumatic arthritis is common even with optimal treatment, and some degree of chronic midfoot stiffness or pain may persist [11][14]
- Key counseling point: Emphasize strict non-weight-bearing compliance — premature weight-bearing can convert a stable injury to an unstable one requiring surgery
References
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