Dorsal Approach to Midfoot: Comprehensive Examination Guide

Introduction and Clinical Context

The dorsal approach to the midfoot encompasses a family of longitudinal incisions on the dorsum of the foot providing access to the tarsometatarsal (TMT) joints (Lisfranc joint complex), naviculocuneiform joints, intercuneiform joints, and metatarsal bases for surgical management of Lisfranc injuries (ligamentous disruptions or fracture-dislocations of TMT joints), primary TMT arthrodesis (fusion for post-traumatic arthritis, Charcot arthropathy, inflammatory arthritis), midfoot fractures (cuneiform, navicular, metatarsal base fractures), and midfoot reconstructive procedures (Charcot reconstruction, cavovarus/planovalgus deformity corrections).

Historical Development and Surgical Evolution

Dorsal approaches to the midfoot evolved from early 20th-century techniques for Lisfranc fracture-dislocation reduction (described by French surgeon Jacques Lisfranc de St. Martin in 1815 - originally AMPUTATION through TMT joints for gangrenous foot, later anatomic name applied to injury pattern). Modern surgical management of Lisfranc injuries emphasizes anatomic reduction and rigid fixation to restore midfoot arch stability, with consensus that displaced injuries (greater than 2mm TMT diastasis) require operative management (Myerson 2007: ORIF superior to nonoperative for displaced Lisfranc injuries - anatomic reduction 85-90% good/excellent outcomes vs nonoperative 50-60%).

The KEY anatomic principle driving dorsal midfoot approach design is preservation of dorsal foot blood supply - the foot has MULTIPLE longitudinal angiosomes (vascular territories) with LIMITED cross-communication, making single transverse incisions across dorsum CONTRAINDICATED (devascularizes skin between incisions, causes necrosis 10-20% - Zwipp 2004). Modern technique uses MULTIPLE longitudinal incisions (2-3 incisions) strategically placed in internervous/intervascular planes to access different midfoot columns while preserving longitudinal blood supply.

Three-column concept (medial, middle, lateral) guides incision planning:

• Medial column: 1st TMT joint (1st metatarsal-medial cuneiform), naviculocuneiform joint medially
• Middle column: 2nd and 3rd TMT joints (2nd/3rd metatarsals-middle/lateral cuneiforms) - KEYSTONE of midfoot arch
• Lateral column: 4th and 5th TMT joints (4th/5th metatarsals-cuboid), calcaneocuboid joint

Most Lisfranc injuries involve medial + middle columns (Myerson classification Types A-C), with lateral column injury less common. Standard two-incision technique (medial + dorsal incisions) addresses medial and middle columns, with third lateral incision added if lateral column injured.

Surgical Anatomy and Key Landmarks

Surface Anatomy and Planning

Palpable landmarks:

• 1st metatarsal base: Prominent medial midfoot (easily palpable), marks 1st TMT joint
• 2nd metatarsal base: Recessed dorsally (keystone - sits between cuneiforms), 2nd TMT joint deepest
• Navicular tuberosity: Medial prominence proximal midfoot (insertion of tibialis posterior tendon)
• Cuboid: Lateral midfoot (less prominent than navicular)
• Dorsalis pedis artery pulse: Palpable on dorsum of foot in 1st-2nd metatarsal interval (marks deep peroneal nerve location)

Skin incision planning (TWO-INCISION STANDARD):

• Medial incision: Over 1st-2nd metatarsal interval
  • Start: Naviculocuneiform joint level (proximal midfoot)
  • End: 1st metatarsal shaft mid-diaphysis (distal midfoot)
  • Length: 6-8cm
  • Access: 1st TMT joint, medial cuneiform, naviculocuneiform joint medially
• Dorsal (central) incision: Over 2nd-3rd metatarsal interval (SAFE ZONE)
  • Start: Naviculocuneiform joint level
  • End: 2nd-3rd metatarsal shafts mid-diaphysis
  • Length: 6-8cm
  • Access: 2nd and 3rd TMT joints, middle/lateral cuneiforms, intercuneiform joints
  • Rationale for 2nd-3rd interval: Deep peroneal nerve runs MEDIALLY (1st webspace), superficial peroneal nerve branches run LATERALLY (4th-5th webspace) - 2nd-3rd interval is between these structures
• Lateral incision (THIRD incision if needed): Over 4th-5th metatarsal interval
  • Start: Calcaneocuboid joint level
  • End: 4th-5th metatarsal shafts mid-diaphysis
  • Length: 5-7cm
  • Access: 4th and 5th TMT joints, cuboid, calcaneocuboid joint

Critical spacing: Maintain MINIMUM 7cm between incisions (medial and dorsal incisions separated by 7cm+ measured at mid-length)

Layer-by-Layer Anatomic Dissection (MEDIAL INCISION)

Layer 1 - Skin and Subcutaneous Tissue:

• Longitudinal incision over 1st-2nd metatarsal interval (6-8cm)
• Incise through subcutaneous tissue
• Identify and protect superficial peroneal nerve branches (intermediate dorsal cutaneous nerve):
  • May cross medial incision (runs from lateral to medial across dorsum)
  • Injury causes dorsal foot numbness (NOT functionally limiting but bothersome)
  • Retract or accept division (sensory only)

Layer 2 - Extensor Tendons:

• Extensor hallucis longus (EHL) tendon: Most medial structure on dorsal foot (runs over 1st metatarsal)
• Extensor hallucis brevis (EHB) tendon: Lateral to EHL (inserts on proximal phalanx of hallux)
• Retract EHL/EHB tendons LATERALLY (away from 1st TMT joint exposure)

Layer 3 - Joint Capsule and Periosteum:

• Incise capsule over 1st TMT joint longitudinally (along dorsal surface)
• Elevate periosteum from 1st metatarsal base and medial cuneiform (subperiosteal)
• Expose 1st TMT joint (medial cuneiform articulates with 1st metatarsal base)
• Can extend proximally to naviculocuneiform joint if needed

Neurovascular Structures:

• Deep peroneal nerve and dorsalis pedis artery: Run in FIRST WEBSPACE (between 1st and 2nd metatarsals)
  • Nerve/artery run LATERAL to EHL tendon
  • Stay MEDIAL to neurovascular bundle (work on medial side of EHL tendon)
  • Neurovascular bundle NOT directly in field for medial incision if dissection stays medial

Layer-by-Layer Anatomic Dissection (DORSAL INCISION)

Layer 1 - Skin and Subcutaneous Tissue:

• Longitudinal incision over 2nd-3rd metatarsal interval (6-8cm)
• Incise through subcutaneous tissue
• Superficial peroneal nerve branches (intermediate and medial dorsal cutaneous nerves):
  • Cross dorsum of foot obliquely (lateral to medial)
  • May require retraction or division (multiple small branches)
  • Injury causes dorsal foot numbness

Layer 2 - Extensor Tendons:

• Extensor digitorum longus (EDL) tendons: Run over 2nd, 3rd, 4th toes
• Extensor digitorum brevis (EDB) tendons: Arise from calcaneus, insert on 2nd-4th toes (run lateral to EDL)
• Interval: BETWEEN EDL to 2nd toe (medially) and EDL to 3rd toe (laterally)
• Retract EDL tendons apart (2nd toe tendon medially, 3rd toe tendon laterally) to expose 2nd-3rd TMT joints

Layer 3 - Deep Peroneal Nerve and Dorsalis Pedis Artery (CRITICAL):

• Location: Run BETWEEN EHL tendon (medially) and EDL tendons (laterally) in 1st webspace
• Course: Deep to extensor tendons, on surface of 2nd metatarsal base/middle cuneiform
• Identification: After retracting EDL tendons, nerve/artery visible as neurovascular bundle running longitudinally
• PROTECTION:
  • Identify neurovascular bundle early in dissection (before proceeding deeper)
  • Retract bundle MEDIALLY (toward EHL) or LATERALLY (toward EDL to 3rd toe) depending on which TMT joint accessing
  • Use vessel loop around bundle to mark location
  • AVOID traction injury (gentle handling), AVOID cautery near nerve (thermal injury)

Layer 4 - Joint Capsule:

• Incise capsule over 2nd and/or 3rd TMT joints longitudinally
• Elevate periosteum subperiosteally from metatarsal bases and cuneiforms
• Expose 2nd TMT (2nd metatarsal-middle cuneiform) and 3rd TMT (3rd metatarsal-lateral cuneiform)
• 2nd metatarsal base RECESSED dorsally (keystone - sits between cuneiforms) - may require slight plantar flexion of 2nd metatarsal to visualize joint

Neurovascular Anatomy and Relationships

Deep Peroneal Nerve:

• Origin: Common peroneal nerve divides into deep and superficial branches
• Course: Runs in anterior compartment of leg, passes under extensor retinaculum at ankle, continues onto dorsum of foot
• Location on foot: Runs in 1st webspace between EHL (medially) and EDL (laterally), accompanies dorsalis pedis artery
• Innervation:
  • Motor: EHL (great toe extension), EDL (lesser toe extension at MTP joints), EHB (hallux extension at IP joint), EDB (lesser toe extension)
  • Sensory: 1st webspace skin (between great toe and 2nd toe dorsally) - SMALL sensory distribution
• Injury consequences:
  • Motor loss: Weak toe extension (functionally minimal - can still walk, most patients unaware)
  • Sensory loss: 1st webspace numbness (NOT functionally limiting)
• Injury rate: 5-10% with dorsal midfoot approaches (usually neuropraxia from retraction, recovers 6-12 months)

Dorsalis Pedis Artery:

• Origin: Continuation of anterior tibial artery (becomes dorsalis pedis at ankle joint level)
• Course: Runs with deep peroneal nerve in 1st webspace
• Branches: 1st dorsal metatarsal artery (supplies 1st webspace), arcuate artery (transverse across metatarsal bases)
• Clinical significance: Primary blood supply to dorsal foot, BUT collateral circulation from plantar arteries usually adequate if injured
• Injury management: Ligate if injured (collateral circulation sufficient in most patients), vascular surgery consultation if pulse absent post-operatively

Superficial Peroneal Nerve:

• Course: Pierces deep fascia 10-15cm proximal to ankle (anterolateral leg), divides into medial dorsal cutaneous nerve (to medial foot/great toe) and intermediate dorsal cutaneous nerve (to lateral foot/lesser toes)
• Distribution: Dorsum of foot sensation (medial and intermediate branches cross dorsum obliquely)
• Injury: Dorsal foot numbness (NOT functionally limiting, patients tolerate well)
• Injury rate: 10-20% with dorsal midfoot approaches (multiple small branches cross incisions, difficult to avoid all)

Indications and Contraindications

Primary Indications (Evidence-Based)

ABSOLUTE Indications:

1. Lisfranc injuries with displacement greater than 2mm:
   • Purely ligamentous (Lisfranc ligament rupture - 1st-2nd TMT diastasis)
   • Fracture-dislocation (metatarsal base fractures with TMT subluxation/dislocation)
   • Myerson classification:
     • Type A: Total incongruity (all TMT joints displaced in same direction)
     • Type B: Partial incongruity (B1 medial displacement, B2 lateral displacement)
     • Type C: Divergent (medial and lateral columns displaced in opposite directions)
   • Evidence: Myerson 2007 - ORIF anatomic reduction 85-90% good/excellent outcomes vs nonoperative 50-60%
2. Primary TMT arthrodesis indications:
   • Post-traumatic arthritis (after Lisfranc injury, despite anatomic reduction - 25-40% develop arthritis)
   • Charcot arthropathy (midfoot collapse - diabetes/neuropathy)
   • Inflammatory arthritis (rheumatoid, psoriatic)
   • Severe progressive flatfoot deformity (medial column instability)
3. Displaced midfoot fractures requiring ORIF:
   • Navicular fractures (body fractures, tuberosity avulsions)
   • Cuneiform fractures (displaced)
   • Metatarsal base fractures (intra-articular, displaced greater than 2mm)

RELATIVE Indications:

1. Non-displaced Lisfranc injuries with instability (dynamic imaging - weight-bearing stress views show diastasis)
2. Revision surgery for hardware removal, malunion correction, nonunion treatment

Contraindications

ABSOLUTE Contraindications:

1. Active infection (osteomyelitis, soft tissue abscess) - requires infection eradication FIRST
2. Severe vascular insufficiency (ABI less than 0.5, absent pulses, tissue loss) - healing unlikely
3. Insensate foot in non-compliant patient (neuropathic foot requires strict offloading - if patient cannot comply, high risk of wound breakdown/Charcot progression)

RELATIVE Contraindications:

1. Significant soft tissue injury (crush injury, compartment syndrome sequelae) - may benefit from delayed surgery or external fixation
2. Non-displaced stable Lisfranc injuries (less than 2mm diastasis on weight-bearing X-rays, no instability) - nonoperative management reasonable
3. Elderly low-demand patients with complex injuries - may favor nonoperative vs extensive reconstruction
4. Severe osteoporosis (very poor bone quality - fixation may fail, consider primary arthrodesis instead of ORIF)

Preoperative Planning and Patient Positioning

Preoperative Assessment

Clinical Examination:

• Midfoot swelling and ecchymosis: Plantar ecchymosis PATHOGNOMONIC for Lisfranc injury (high suspicion)
• Neurovascular assessment: Dorsalis pedis and posterior tibial pulses, sensory examination (rule out compartment syndrome)
• Deformity assessment: Forefoot abduction/adduction, pronation/supination
• Stability testing: Passive abduction stress on forefoot (pain/crepitus suggests instability)

Radiographic Planning:

• AP, lateral, oblique foot X-rays:
  • AP view: Assess 1st-2nd TMT diastasis (normal less than 2mm), alignment of medial border of 2nd metatarsal with medial border of middle cuneiform
  • Lateral view: Assess dorsal subluxation/dislocation, loss of arch height
  • Oblique view: Assess lateral column (4th-5th TMT alignment)
  • Weight-bearing views (if patient can tolerate): May reveal instability not apparent on non-weight-bearing films
• CT scan (for complex fractures): 3D reconstruction identifies fracture lines, comminution, articular involvement
• MRI (for subtle injuries): Identifies Lisfranc ligament rupture (purely ligamentous injury without fracture), bone marrow edema

Surgical Planning:

• Reduction strategy: Plan reduction sequence (typically medial to lateral - restore medial column, then keystone 2nd metatarsal, then lateral column)
• Fixation strategy:
  • Purely ligamentous: Screws across TMT joints (temporary vs permanent)
  • Fracture-dislocation: Plate/screw fixation of fractures, screws across intact TMT joints
  • Debate: Transarticular screws temporary (remove 12 weeks) vs permanent vs primary arthrodesis for severe injuries
• Incision planning: Two incisions standard (medial + dorsal), add lateral incision if lateral column injured

Patient Positioning

SUPINE position with bump under ipsilateral hip (STANDARD):

• Position: Patient supine, bump under ipsilateral hip (externally rotates leg, presents dorsum of foot)
• Leg position:
  • Knee flexed 20-30° (relaxes ankle plantarflexors)
  • Ankle neutral (or slight plantar flexion for 2nd TMT exposure if recessed)
  • Foot supported on sterile towels or foam bolster
• Tourniquet: Thigh tourniquet (exsanguinate, inflate to 300-350mmHg) - hemostasis critical for small midfoot structures
• C-arm access: From contralateral side (AP and lateral foot fluoroscopy)

Step-by-Step Surgical Technique (TWO-INCISION APPROACH)

Step 1: Medial Incision and 1st TMT Exposure

Technique:

1. Mark medial incision: 6-8cm longitudinal incision over 1st-2nd metatarsal interval
   • Proximal: Naviculocuneiform joint level
   • Distal: 1st metatarsal shaft mid-diaphysis
2. Incise skin and subcutaneous tissue down to extensor tendons
3. Identify EHL tendon (most medial extensor tendon, runs over 1st metatarsal)
4. Retract EHL laterally (exposes 1st metatarsal base and medial cuneiform)
5. Incise joint capsule over 1st TMT joint longitudinally (dorsal surface)
6. Subperiosteal elevation: Elevate periosteum from 1st metatarsal base and medial cuneiform
7. Expose 1st TMT joint: Full visualization of dorsal and medial aspects (can extend exposure to naviculocuneiform joint proximally if needed)

Step 2: Dorsal Incision and 2nd-3rd TMT Exposure

Technique:

1. Mark dorsal incision: 6-8cm longitudinal incision over 2nd-3rd metatarsal interval
   • Proximal: Naviculocuneiform joint level
   • Distal: 2nd-3rd metatarsal shafts mid-diaphysis
   • CRITICAL: Maintain 7cm+ separation from medial incision
2. Incise skin and subcutaneous tissue down to extensor tendons
3. Identify EDL tendons: To 2nd toe (medially) and 3rd toe (laterally)
4. Identify deep peroneal nerve and dorsalis pedis artery (CRITICAL STEP):
   • Neurovascular bundle runs BETWEEN EHL (medially) and EDL tendons (laterally)
   • Visible after retracting EDL tendons apart
   • Place vessel loop around bundle (marks location, allows gentle retraction)
5. Retract neurovascular bundle: MEDIALLY (toward EHL) for 2nd TMT access, OR LATERALLY (toward EDL to 3rd toe) for 3rd TMT access
6. Incise joint capsules over 2nd and 3rd TMT joints longitudinally
7. Subperiosteal elevation: Expose 2nd metatarsal base, middle cuneiform, 3rd metatarsal base, lateral cuneiform
8. Expose 2nd and 3rd TMT joints: Full dorsal visualization (2nd metatarsal base may be RECESSED - use small laminar spreader or slight plantar flexion of 2nd metatarsal to open joint for visualization)

Step 3: Fracture/Dislocation Reduction (Lisfranc Injury)

Reduction Sequence (Medial to Lateral):

1. Reduce 1st TMT joint FIRST (medial column - foundational):
   • Technique: Direct pressure on 1st metatarsal head (plantar direction) + pull on 1st metatarsal base (medial and plantar direction)
   • Goal: Restore alignment of 1st metatarsal base with medial cuneiform (anatomic articulation)
   • Temporary fixation: K-wires across 1st TMT joint (2.0mm K-wires, 2 wires for stability)
   • Fluoroscopy: AP and lateral views confirm anatomic reduction
2. Reduce 2nd TMT joint SECOND (keystone - critical for arch stability):
   • Technique: Elevate 2nd metatarsal base dorsally (disimpact if depressed), reduce medially (align with middle cuneiform)
   • Goal: Restore alignment of medial border of 2nd metatarsal base with medial border of middle cuneiform (AP view), restore height (lateral view)
   • Temporary fixation: K-wires across 2nd TMT (dorsal to plantar direction, 2 wires)
   • Fluoroscopy: AP view - medial borders MUST align (no step-off, no gap), lateral view - 2nd metatarsal base not depressed dorsally
3. Reduce 3rd TMT joint THIRD:
   • Usually reduces INDIRECTLY once 2nd TMT reduced (3rd metatarsal follows 2nd metatarsal)
   • If separate displacement: Direct manipulation + K-wire fixation
4. Check 1st-2nd TMT diastasis:
   • Fluoroscopy AP view: Distance between 1st and 2nd metatarsal bases should be less than 2mm
   • If diastasis persists: Consider screw across 1st to 2nd metatarsal bases (controversial - some surgeons place, others rely on anatomic reduction of each TMT joint individually)

Step 4: Definitive Fixation (Multiple Options)

Option A: Transarticular Screws (Most Common):

• 1st TMT: 2 screws (4.0mm or 4.5mm cannulated screws) from 1st metatarsal base into medial cuneiform
  • Direction: Dorsal-medial to plantar-lateral (perpendicular to joint), one screw each in dorsal and plantar halves
  • Engage medial cuneiform and navicular (bicortical purchase distally)
• 2nd TMT: 1-2 screws from 2nd metatarsal base into middle cuneiform
  • Direction: Dorsal to plantar (perpendicular to joint)
  • Challenging: 2nd metatarsal base recessed (requires careful drilling to avoid neurovascular bundle)
• 3rd TMT: 1 screw (if unstable) from 3rd metatarsal base into lateral cuneiform
• Intercuneiform screws (optional): Screw from medial cuneiform to middle cuneiform (stabilizes medial arch)
• Debate: Temporary (remove 12 weeks) vs permanent screws
  • Temporary: Allows TMT motion after healing, may reduce arthritis risk (controversial)
  • Permanent: Avoids second surgery, similar outcomes (Ly 2010: no difference functional outcomes temporary vs permanent)

Option B: Plate Fixation:

• Low-profile plate (2.7mm or 3.5mm) along dorsal metatarsal bases
• Screws into metatarsal shafts distally, cuneiforms proximally
• Used for: Metatarsal base fractures requiring fragment-specific fixation, comminuted fractures
• Less common than screws alone for purely ligamentous injuries

Option C: Primary Arthrodesis (Fusion):

• Reserved for: Severe cartilage damage at presentation, revision after failed ORIF, Charcot arthropathy
• Technique: Remove articular cartilage, compress joints with screws/plates, bone graft if large gaps
• Fusion rate: 90-95% with rigid compression
• Outcomes: Similar to anatomic reduction with ORIF (Komenda 2001: TMT arthrodesis AOFAS 80-85 points)

Step 5: Closure

Technique:

1. Irrigate wounds: Copious saline lavage
2. Close capsules (if possible): Reapproximate with absorbable sutures (3-0 Vicryl)
3. Subcutaneous closure: 3-0 or 4-0 absorbable sutures
4. Skin closure: Simple interrupted or subcuticular (3-0 or 4-0 nylon/monocryl)
5. Dressing: Bulky compressive dressing, posterior splint (ankle neutral, foot neutral)
6. Post-operative protocol:
   • Weeks 0-6: NON-weight-bearing (crutches), remove sutures 2-3 weeks, transition to short-leg cast or boot
   • Weeks 6-12: Advance to partial weight-bearing in boot (radiographic healing assessed)
   • Week 12: Full weight-bearing, wean from boot
   • Temporary hardware removal (if planned): 12 weeks post-ORIF (after ligament healing)

Complications and Management

Intraoperative Complications

1. Deep Peroneal Nerve Injury (5-10% incidence)

Recognition:

• Visual injury during dorsal incision (transection, cautery burn, excessive retraction)
• Post-operative: Weak toe extension (EHL/EDL weakness), 1st webspace numbness

Management:

• Intraoperative: If transected sharply, consider primary repair (8-0 or 9-0 nylon epineurial sutures) - outcomes variable
• Post-operative: Most injuries are neuropraxia from retraction - observe, 70-80% recover 6-12 months
• Permanent deficit: Weak toe extension (functionally minimal - patients compensate, AFO not needed), 1st webspace numbness (NOT functionally limiting)

Prevention:

• Identify neurovascular bundle early in dorsal incision dissection (BEFORE proceeding deep to joint capsules)
• Vessel loop around bundle (marks location, allows gentle retraction)
• Retract GENTLY (avoid excessive traction)
• Stay in 2nd-3rd metatarsal interval (deep peroneal nerve medially in 1st webspace, superficial peroneal nerve laterally in 4th-5th webspace - 2nd-3rd is 'safe zone')

2. Dorsalis Pedis Artery Injury (Rare, less than 1%)

Recognition:

• Pulsatile bleeding during dissection
• Loss of DP pulse post-operatively

Management:

• Intraoperative: Ligate if injured (collateral circulation from plantar arteries usually adequate)
• Post-operative: If pulse absent and foot ischemic (cool, pale) - vascular surgery consultation (rare complication)

3. Inadequate Reduction (5-10% incidence)

Recognition:

• Fluoroscopy shows persistent diastasis (greater than 2mm), malalignment
• Usually at 2nd TMT (keystone difficult to reduce if severely depressed or comminuted)

Management:

• Intraoperative: Repeat reduction maneuvers (disimpaction, use of laminar spreader to open joint, K-wire joysticks in metatarsal bases)
• If anatomic reduction not achievable (severe comminution, osteochondral damage): Consider PRIMARY ARTHRODESIS (convert ORIF to fusion - remove cartilage, compress with screws, bone graft) - better outcome than malreduced ORIF (Komenda 2001)

Early Post-operative Complications (0-12 weeks)

1. Wound Complications (5-10% incidence with proper technique)

Types:

• Superficial dehiscence (3-5%)
• Superficial infection (2-3%)
• Skin necrosis (rare less than 1% with proper incision planning)

Risk factors:

• Improper incision placement (transverse incisions, skin bridges less than 7cm, undermining)
• Diabetes (healing impaired)
• Smoking (poor perfusion)
• Significant soft tissue trauma at injury (crush, compartment syndrome)

Management:

• Superficial: Local wound care, oral antibiotics if cellulitis
• Deep infection: Return to OR for irrigation/debridement, IV antibiotics, hardware removal if infected and not required for stability
• Skin necrosis: Early debridement, negative pressure wound therapy, skin graft or flap coverage if large defect

2. Loss of Reduction (3-5% incidence)

Recognition:

• Serial X-rays show recurrent diastasis, malalignment
• Usually early (first 4-6 weeks before ligament healing)

Mechanism:

• Inadequate initial fixation (insufficient screws, screw pull-out in osteoporotic bone)
• Early weight-bearing (patient non-compliance)
• Hardware failure (screw breakage)

Management:

• Early (less than 6 weeks): Consider revision ORIF (re-reduce, augment fixation with additional screws/plate)
• Late (greater than 6 weeks): Observe, plan arthrodesis if symptomatic arthritis develops

Late Post-operative Complications (12+ weeks)

1. Post-Traumatic Arthritis (25-40% incidence long-term)

Recognition:

• Persistent midfoot pain (worse with activity, walking on uneven ground)
• Stiffness, swelling
• X-rays: TMT joint space narrowing, subchondral sclerosis, osteophytes

Risk factors:

• Severe initial injury (high-energy trauma, cartilage damage)
• Malreduction (residual diastasis greater than 2mm, articular step-off)
• EVEN WITH anatomic reduction: 25% develop arthritis (irreversible cartilage damage from initial trauma - Myerson 2007)

Management:

• Conservative: NSAIDs, activity modification, stiff-soled shoes or carbon fiber inserts (limit TMT motion), corticosteroid injections (temporary relief)
• Surgical: TMT arthrodesis (fusion)
  • Indications: Failed conservative management, significant pain limiting function
  • Technique: Remove articular cartilage from affected TMT joints, compress with screws/plates, bone graft if large voids
  • Outcomes: 85-90% pain relief, 90-95% fusion rate, patients satisfied (Komenda 2001: TMT arthrodesis AOFAS 80-85 points)
  • Functional impact: Loss of TMT motion (minimal functional loss - TMT joints normally contribute little to gait)

2. Hardware Prominence/Irritation (10-15% incidence)

Recognition:

• Palpable/prominent screw heads or plate on dorsal foot
• Pain with shoe wear, direct pressure
• Skin tenting over hardware

Management:

• Observation if asymptomatic
• Hardware removal after fracture/ligament healing (12+ weeks post-ORIF)
  • Timing: Temporary screws removed 12 weeks (planned), permanent hardware removed if symptomatic (unplanned but common 10-15%)
  • Outcomes: 85-90% symptom resolution with hardware removal

3. Malunion (if inadequate reduction at index procedure)

Recognition:

• Persistent forefoot abduction, loss of arch height
• Abnormal shoe wear pattern, difficulty with shoes
• X-rays: Diastasis, malalignment

Management:

• Conservative: Orthotic devices (custom arch support), extra-depth shoes
• Surgical: Corrective osteotomy + fusion (complex, reserved for severe symptomatic malunion)

Pearls, Pitfalls, and Expert Tips

Surgical Pearls (What Separates Good from Great)

Pearl 1: Multiple LONGITUDINAL incisions - NEVER transverse

• Preserve dorsal foot blood supply (angiosomes run longitudinally)
• Maintain 7cm+ separation between incisions (preserves intervening skin perfusion)
• Transverse incisions devascularize skin (necrosis 10-20% - Zwipp 2004)

Pearl 2: Reduce medial column (1st TMT) FIRST

• Foundational - establishes medial arch reference
• All other reductions reference off anatomic 1st TMT
• Sequence: 1st TMT → 2nd TMT (keystone) → 3rd TMT (follows 2nd)

Pearl 3: Deep peroneal nerve in dorsal incision - identify EARLY

• Neurovascular bundle between EHL and EDL tendons (1st webspace)
• Place vessel loop around bundle BEFORE proceeding deep to capsule
• Gentle retraction only (excessive traction = neuropraxia)

Pearl 4: 2nd TMT is RECESSED (keystone)

• 2nd metatarsal base sits between cuneiforms (dorsally recessed)
• May require slight plantar flexion of 2nd metatarsal to visualize joint
• Use laminar spreader to open joint if needed (improves visualization)

Pearl 5: Fluoroscopy alignment checks (CRITICAL views)

• AP view: Medial border 2nd metatarsal MUST align with medial border middle cuneiform (no step-off, no gap)
• Lateral view: 2nd metatarsal base NOT depressed dorsally (maintains arch height)
• Oblique view: 4th-5th TMT alignment if lateral column injured

Common Pitfalls (and How to Avoid Them)

Pitfall 1: Single transverse incision across dorsum

• Problem: Devascularizes skin (necrosis 10-20%), causes wound complications
• Solution: MULTIPLE longitudinal incisions (2-3 incisions), 7cm+ separation, oriented parallel to metatarsals
• Recovery: If necrosis occurs - debridement, negative pressure wound therapy, skin graft/flap

Pitfall 2: Parallel incisions too close together (less than 7cm apart)

• Problem: Creates ischemic skin bridge (necrosis risk 5-10%)
• Solution: Measure separation at mid-length of incisions (minimum 7cm), adjust positions if needed
• Alternative: If more exposure needed, extend existing incisions proximally/distally rather than adding closer parallel incision

Pitfall 3: Not recognizing deep peroneal nerve

• Problem: Inadvertent injury (transection, cautery, excessive retraction) causes toe extension weakness, numbness
• Solution: Identify neurovascular bundle EARLY (after retracting EDL tendons, before incising capsule), vessel loop marks location
• Recovery: Most injuries are neuropraxia (recover 6-12 months), transection has poor recovery despite repair

Pitfall 4: Accepting malreduction (persistent 1st-2nd diastasis greater than 2mm)

• Problem: Malreduction leads to poor outcomes (AOFAS 58 vs 85 with anatomic reduction - Myerson 2007), high arthritis rate (60% vs 25%)
• Solution: Repeat reduction maneuvers, use K-wire joysticks in metatarsal bases for manipulation, consider intraoperative decision for primary arthrodesis if anatomic reduction not achievable
• Prevention: Multiple fluoroscopy views BEFORE definitive fixation (confirm less than 2mm diastasis, alignment of borders)

Pitfall 5: Inadequate fixation (single screw per TMT joint)

• Problem: Hardware failure, loss of reduction (recurrent diastasis)
• Solution: Minimum 2 screws per TMT joint (1st TMT always 2 screws - dorsal and plantar halves), consider intercuneiform screws for medial arch stability
• Alternative: If bone quality poor (osteoporotic), use low-profile plates instead of screws alone (distributes load)

Expert Tips (From High-Volume Surgeons)

Tip 1: Use 2nd-3rd metatarsal interval for dorsal incision (SAFE ZONE)

• Deep peroneal nerve medially (1st webspace), superficial peroneal nerve laterally (4th-5th webspace)
• 2nd-3rd interval is BETWEEN these structures (lower nerve injury risk)

Tip 2: K-wire joysticks in metatarsal bases aid reduction

• Insert 2.0mm K-wires into metatarsal bases (act as handles)
• Manipulate bases into position using K-wires (better control than finger manipulation)
• Leave K-wires in place as temporary fixation until definitive screws placed

Tip 3: Consider primary arthrodesis for severe injuries

• If severe comminution, osteochondral damage, or difficult to achieve anatomic reduction: Convert to fusion
• Komenda 2001: Primary arthrodesis AOFAS 82 vs ORIF 72 for severe patterns (p = 0.04)
• Avoids 68% secondary fusion rate after failed ORIF

Tip 4: Temporary screws removed 12 weeks (if planned)

• Return to OR 12 weeks post-ORIF (ligament healing complete)
• Remove screws percutaneously under fluoroscopy guidance (usually does NOT require large incisions)
• Protect from re-injury (boot for 2-4 weeks post-removal, gradual return to activities)

Tip 5: Counsel on arthritis risk REGARDLESS of reduction quality

• 25% develop post-traumatic arthritis even with anatomic reduction (Myerson 2007)
• Irreversible cartilage damage from initial high-energy trauma
• TMT arthrodesis salvage procedure has good outcomes (AOFAS 80-85, 90-95% pain relief)
• Set realistic expectations (surgery maximizes chance of good outcome but cannot guarantee perfect result)