Anterior Approach to the Ankle

The anterior ankle approach provides access for ankle arthrodesis, total ankle arthroplasty, and distal tibial/talar fracture fixation through the interval between tibialis anterior and extensor hallucis longus (EHL). The deep peroneal nerve and anterior tibial artery travel together 1-2cm lateral to EHL at ankle level—they must be identified early and retracted medially WITH the EHL to prevent injury (1-3% risk). The superficial peroneal nerve branches emerge 10-12cm proximal to the lateral malleolus and cross the field laterally (3-5% injury rate). Although both TA and EHL are supplied by the deep peroneal nerve (not a true internervous plane), dissection is safe because the nerve travels laterally with EHL. Extensor retinaculum repair is essential at closure to prevent tendon bowstringing.

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The anterior approach to the ankle provides direct access to the tibiotalar joint through a relatively safe interval between the tibialis anterior and extensor hallucis longus tendons. This approach exploits the superficial nature of the anterior ankle anatomy and the predictable course of neurovascular structures.

Why This Approach?

Advantages:

• Direct visualization of anterior tibial plafond and talar dome
• Extensile - can be extended proximally to tibial shaft or distally to talar neck
• Relatively safe neurovascular structures if technique systematic
• Minimal muscle dissection - interval between tendons, no muscle cutting required
• Good bone access for implant placement in arthrodesis and arthroplasty

Disadvantages:

• Cannot access posterior ankle - requires separate posterior approach for posterior pathology
• Superficial peroneal nerve at risk - variable anatomy makes injury possible
• Wound healing concerns - thin soft tissue envelope over anterior ankle
• Limited lateral access - cannot safely extend to lateral malleolus through same incision

Primary Indications

Ankle Arthrodesis:

• End-stage post-traumatic arthritis with pain and disability
• Inflammatory arthropathy (rheumatoid arthritis, psoriatic arthritis) with joint destruction
• Failed total ankle arthroplasty requiring salvage fusion
• Significant ankle deformity requiring correction (varus, valgus, equinus)
• Neuromuscular conditions with ankle instability and deformity
• Avascular necrosis of talus with secondary arthritis

Total Ankle Arthroplasty:

• End-stage ankle arthritis in appropriate candidates
• Age typically over 50 years with lower physical demands
• Neutral or correctable alignment (within 15 degrees varus/valgus)
• Adequate bone stock for component fixation
• Absence of significant comorbidities (peripheral vascular disease, neuropathy)
• Patient preference for motion preservation vs arthrodesis

Fracture Fixation:

• Pilon fractures (tibial plafond fractures) requiring anatomic articular reduction
• Displaced talar neck fractures (Hawkins type II, III, IV)
• Talar body fractures with articular involvement
• Displaced anterior process talus fractures
• Malunion or nonunion of distal tibia or talus requiring revision

Other Indications:

• Osteochondral lesions of anterior talar dome (greater than 1.5cm, uncontained)
• Anterior ankle impingement syndrome with large osteophytes
• Septic arthritis requiring formal washout and debridement
• Synovectomy for inflammatory arthropathy
• Removal of loose bodies or failed hardware

Contraindications

Absolute:

• Active infection overlying surgical site (unless procedure is infection debridement)
• Severe peripheral vascular disease with compromised healing potential (ankle-brachial index less than 0.5)

Relative:

• Poor soft tissue envelope (previous burns, infection, radiation, compromised skin quality)
• Morbid obesity (BMI greater than 40) complicating deep access and wound healing
• Severe osteoporosis with inadequate bone for fixation
• Active Charcot arthropathy
• Unrealistic patient expectations for functional outcomes

This approach provides excellent exposure for the most common ankle procedures performed in orthopaedic surgery.

Surgical Anatomy for Anterior Ankle Approach

Approach Variations

Pre-operative Imaging

Surgical Decision-Making

Safe Interval for Anterior Ankle Approach

The anterior ankle approach uses the interval between tibialis anterior (medial) and extensor hallucis longus (lateral).

Why It Works:

• Deep peroneal nerve travels in fascial plane LATERAL to EHL
• At ankle level: nerve lies 1-2cm lateral to EHL tendon
• Dissection is MEDIAL to neurovascular bundle
• Retract EHL and nerve together MEDIALLY throughout procedure

Surface Landmarks

Key Palpable Structures:

Tibialis Anterior Tendon:

• Most medial and prominent anterior ankle tendon
• Becomes subcutaneous at ankle level
• Easily palpated with foot dorsiflexion and inversion
• Inserts on medial cuneiform and base of first metatarsal
• Surgical landmark: Medial border of approach

Extensor Hallucis Longus Tendon:

• Central anterior ankle structure
• Passes to great toe (hallux)
• Palpate by asking patient to extend hallux against resistance
• Surgical landmark: Center of skin incision lies over or just lateral to this tendon

Extensor Digitorum Longus Tendons:

• Multiple tendons passing to toes 2-5
• Lateral to EHL
• Palpate with toe extension
• Surgical landmark: Lateral border of approach

Dorsalis Pedis Pulse:

• Palpable between EHL and EDL tendons at ankle level
• Marks position of anterior tibial artery and deep peroneal nerve
• Important: Absent in 8-12% of normal population (anatomic variation)
• Surgical landmark: Check pre-operatively and post-operatively

Malleoli:

• Medial malleolus and lateral malleolus provide bony landmarks
• Ankle joint line is approximately 1cm distal to tip of malleoli
• Used for proximal-distal orientation of incision

Internervous Plane

The Concept:

The anterior ankle approach uses the interval between tibialis anterior (medial) and extensor hallucis longus (lateral).

Important caveat: This is NOT a true internervous plane because both muscles are supplied by the same nerve (deep peroneal nerve). However, it is a SAFE interval because:

• The deep peroneal nerve travels in the fascial plane LATERAL to EHL
• Dissection occurs MEDIAL to the neurovascular bundle
• No motor nerve branches cross the plane of dissection
• The nerve can be identified and protected by retracting it medially with the EHL

Muscle Innervation:

• Tibialis anterior: Deep peroneal nerve (L4, L5)
• Extensor hallucis longus: Deep peroneal nerve (L5, S1)
• Extensor digitorum longus: Deep peroneal nerve (L5, S1)

Because all three muscles share the same nerve supply, the safety of this approach depends on systematic identification and protection of the neurovascular bundle, not on a true internervous dissection.

Neurovascular Anatomy

Deep Peroneal Nerve:

Course:

• Originates from common peroneal nerve at fibular neck level
• Enters anterior compartment by piercing anterior intermuscular septum
• Descends between tibialis anterior and extensor hallucis longus
• Lies on interosseous membrane in proximal and mid leg
• Moves LATERALLY in distal third of leg
• At ankle joint level: positioned 1-2cm lateral to EHL tendon
• Depth at ankle: 1-2cm deep to extensor retinaculum

Terminal Branches (at ankle level):

• Medial branch: Sensory to first web space (between hallux and second toe)
• Lateral branch: Motor to extensor digitorum brevis and extensor hallucis brevis

Clinical significance:

• Injury causes foot drop (cannot dorsifl ex ankle or extend toes)
• Sensory loss in first web space
• Tinel sign at site of injury if neuroma develops

Protection strategy:

• Identify nerve by palpating dorsalis pedis pulse (nerve travels with artery)
• Visualize nerve in distal wound during superficial dissection
• Retract nerve MEDIALLY with EHL tendon throughout procedure
• Gentle retraction only (excessive force causes neuropraxia)
• Protect during saw cuts with blade guards and direct visualization

Anterior Tibial Artery:

Course:

• Originates from popliteal artery in posterior compartment
• Passes anteriorly through gap in proximal interosseous membrane
• Descends on anterior surface of interosseous membrane
• Accompanied by two venae comitantes
• Becomes dorsalis pedis artery at level of ankle joint
• Pulse palpable between EHL and EDL tendons

Clinical significance:

• Provides blood supply to dorsum of foot
• Injury can compromise foot perfusion if posterior tibial artery also compromised
• Most patients tolerate anterior tibial artery ligation if posterior tibial and peroneal arteries intact

Protection strategy:

• Same as deep peroneal nerve (they travel together)
• Identify by palpating pulse or using handheld Doppler
• Retract medially with nerve and EHL
• If injured: attempt primary repair with 6-0 or 7-0 Prolene OR ligate if foot perfusion adequate

Superficial Peroneal Nerve:

Course:

• Descends in lateral compartment between peroneus longus and brevis
• Emerges through deep fascia approximately 10-12cm proximal to lateral malleolus
• Divides into medial dorsal cutaneous and intermediate dorsal cutaneous nerves
• These branches cross anterior ankle subcutaneously
• HIGHLY variable anatomy - position varies considerably between patients

Branches:

• Medial dorsal cutaneous: Supplies dorsum of foot and medial toes
• Intermediate dorsal cutaneous: Supplies lateral dorsum of foot

Clinical significance:

• Injury causes numbness/paraesthesias over dorsum of foot
• Neuroma formation causes painful Tinel sign and shooting pains
• One of most common nerve injuries in anterior ankle approach (3-5% incidence)

Protection strategy:

• Careful skin incision with identification of any visible nerve branches
• Use scalpel perpendicular to skin (avoid beveling which can lacerate nerves)
• Mobilize identified nerves gently with blunt dissection
• Protect with vessel loops or small retractors
• Keep incision centered (more medial incision has lower risk but less access)

Extensor Retinaculum

Superior Extensor Retinaculum:

• Y-shaped band, 2-3cm wide
• Attaches laterally to anterior fibula, medially to anterior tibia
• Located approximately 2-4cm proximal to ankle joint
• Prevents bowstringing of tendons during dorsiflexion

Inferior Extensor Retinaculum:

• Y-shaped with stem laterally on calcaneus
• Creates individual tunnels for each tendon:
• Medial: Tibialis anterior (separate tunnel)
• Central: Extensor hallucis longus (separate tunnel)
• Lateral: Extensor digitorum longus and peroneus tertius (common tunnel)
• Neurovascular bundle passes DEEP to inferior retinaculum

Surgical importance:

• Must be released to mobilize tendons for joint access
• CRITICAL: Must be repaired at closure to prevent tendon bowstringing
• Tag edges with sutures at time of release for easier identification during closure
• Repair with strong absorbable suture (0 Vicryl) using horizontal mattress pattern

Failure to repair retinaculum results in functional deficit from loss of mechanical efficiency.

Anaesthesia

Preferred Option:

• Spinal or epidural anaesthesia with sedation
• Advantages:
• Post-operative analgesia (patient comfort in recovery)
• Lower VTE risk compared to general anaesthesia
• Patient can provide feedback if nerve stimulation occurs (rare)
• Faster recovery and discharge

Alternative:

• General anaesthesia if regional contraindicated or patient preference
• Endotracheal intubation or laryngeal mask airway
• Standard monitoring

Adjuncts:

• Tranexamic acid (TXA): 1g IV at induction, repeat 1g at 3 hours if prolonged case
• Reduces blood loss by 30-50%
• Decreases transfusion requirement
• Safe in most patients (contraindicated in active VTE, renal failure)
• Popliteal nerve block: For post-operative analgesia
• Administered by anaesthetist pre-operatively or in recovery
• Provides 12-24 hours pain relief
• Caution: blocks motor function, cannot assess nerve injury immediately post-op

Positioning

Patient Position:

• Supine on radiolucent operating table
• Arms positioned on arm boards (abducted less than 90 degrees) OR tucked at sides with padding

Hip Positioning:

• Small bump (folded towel or sandbag) under ipsilateral hip
• Purpose: Internally rotates entire leg, bringing anterior ankle surface parallel to floor
• Improves access to anterior ankle
• Facilitates perpendicular approach to joint

Knee Positioning:

• Slight flexion (10-15 degrees) with bump or bolster under knee
• Relaxes gastrocnemius muscle
• Improves anterior ankle access
• Some surgeons omit this for ankle arthrodesis

Foot Positioning:

• Hanging free off end of table OR supported on sterile bolster
• Allows foot manipulation during procedure
• Facilitates fluoroscopic imaging (AP and lateral views without table interference)
• Assistant can hold foot in desired position

Pressure Point Protection:

• Sacrum: Gel pad or pressure-relieving mattress
• Heels: Padding to prevent pressure ulcers
• Contralateral leg: Pad fibular head (common peroneal nerve protection)
• Arms: Padding if tucked, secure if on arm boards
• Safety strap across thighs (not over tourniquet if used)

Tourniquet Use

Surgeon Preference Decision:

Many experienced surgeons operate without tourniquet for anterior ankle approach:

Advantages of no tourniquet:

• Allows assessment of tissue perfusion throughout procedure
• No ischaemia-reperfusion injury
• Can identify and cauterize bleeding vessels as encountered
• No time pressure from tourniquet time limits
• Avoids potential nerve injury from cuff pressure

If tourniquet used:

• High thigh tourniquet (broadest cuff that fits)
• Pressure: 100mmHg above systolic BP (typically 250-300mmHg)
• Exsanguination: Leg elevation preferred over Esmarch bandage
• Esmarch can displace fracture fragments if trauma case
• Elevation for 2-3 minutes adequate for ankle surgery
• Inflate tourniquet after skin preparation and draping complete
• Deflate before closure to ensure adequate haemostasis
• Document tourniquet time (aim for less than 120 minutes)

Skin Preparation and Draping

Skin Preparation:

• Chlorhexidine 2% in 70% alcohol - evidence-based gold standard
• Superior to povidone-iodine for surgical site infection reduction
• Allow to dry completely (60-90 seconds) for maximum effect
• Prepare circumferentially from toes to below knee
• Include entire foot and distal leg in prep area

Draping:

• Extremity drape with impervious barrier
• Ankle and foot fully exposed
• Consider split stockinette over toes to keep field clean
• Secure drapes to prevent migration during foot manipulation

Imaging Setup

Image Intensifier:

• Position C-arm for AP and lateral views of ankle
• Practice taking images before starting to ensure adequate visualization
• Radiolucent table essential for good image quality
• Mark orientation on drapes (medial, lateral) for reference

WHO Surgical Safety Checklist

Before Incision (Team Time Out):

• Correct patient: Confirm name and date of birth
• Correct side: Verify surgical site marked with indelible marker
• Correct procedure: Confirm with patient consent and operative plan
• Antibiotics: Cefazolin 2g IV (or alternative if allergic) given within 60 minutes of incision
• VTE prophylaxis: Plan confirmed (mechanical compression, chemical prophylaxis)
• Equipment: Implants and instruments available and correct
• Anticipated problems: Discuss any concerns (fracture complexity, bone quality issues)
• Image availability: Pre-operative imaging in operating room for reference

This systematic approach to positioning and setup minimizes complications and optimizes surgical exposure.

Immediate Recovery (Day 0)

Neurovascular Assessment:

• Document immediately upon arrival to recovery
• Motor function: Great toe extension (extensor hallucis longus - deep peroneal nerve L5,S1)
• If nerve block used, will be absent until block wears off
• Test again at 6-12 hours when block expected to resolve
• Sensation: First web space sensation (deep peroneal nerve territory)
• Light touch or pinprick
• Compare to contralateral foot
• Vascular assessment:
• Dorsalis pedis pulse palpation (document present/absent/Doppler-audible)
• Posterior tibial pulse
• Capillary refill (press toenail, should refill in under 2 seconds)
• Skin color and temperature of foot
• Document findings in nursing notes and medical record

Radiographic Confirmation:

• AP and lateral ankle X-rays in recovery
• Check for:
• Hardware position (screws, plates, prosthesis components)
• Alignment (anterior-posterior translation, varus/valgus)
• No intra-articular screw penetration
• Joint reduction maintained (if fracture)
• Address any issues promptly (return to OR if needed for malposition)

Pain Management:

• Multimodal analgesia (superior to opioids alone):
• Paracetamol 1g PO/IV every 6 hours (around-the-clock dosing)
• NSAIDs: Ibuprofen 400mg PO every 8 hours OR celecoxib 200mg daily (if no contraindication)
• Caution in arthrodesis (some evidence NSAIDs delay bone healing)
• Safe in arthroplasty and fracture fixation
• Opioids: Oxycodone 5-10mg PO every 4-6 hours as needed for breakthrough pain
• Nerve block residual effect (if popliteal block placed)
• Ice therapy: Cryotherapy unit or ice packs (20 minutes on, 20 minutes off)

Limb Elevation:

• Leg elevated above heart level
• Reduces swelling and pain
• Use pillows under calf (not under heel - pressure ulcer risk)
• Mobilize with elevation stand or CPM if available

VTE Prophylaxis:

• Mechanical prophylaxis:
• Pneumatic compression device on contralateral leg
• Early mobilization as soon as safe
• Chemical prophylaxis (start 12-24 hours post-op):
• Enoxaparin 40mg SC once daily OR
• Rivaroxaban 10mg PO once daily OR
• Apixaban 2.5mg PO twice daily
• Duration: 14-35 days depending on procedure and risk factors
• High risk (arthroplasty, trauma): 35 days
• Standard risk (arthrodesis): 14-28 days

Inpatient Phase (Days 1-2)

Mobilization:

• Physiotherapy on day 1 (unless contraindicated)
• Gait training with appropriate walking aid:
• Non-weight bearing: Crutches or walker, touch-down only for balance
• Weight-bearing as tolerated: Walking boot, progress as comfort allows

Weight-bearing Status:

Ankle Arthrodesis:

• Strict non-weight bearing for minimum 6-8 weeks
• Critical: Early weight-bearing increases nonunion risk significantly
• Use crutches or walker
• Educate patient on importance of compliance

Total Ankle Arthroplasty:

• Protocol-dependent (varies by surgeon and implant system):
• Some protocols: Non-weight bearing for 2 weeks, then WBAT in boot
• Other protocols: Immediate WBAT in boot
• Modern implants generally allow earlier weight-bearing
• Walking boot for support and protection
• Progress to regular shoes at 6-8 weeks typically

Fracture Fixation:

• Pilon fractures: Typically non-weight bearing for 6-8 weeks (depends on fracture pattern and fixation stability)
• Talar fractures: Non-weight bearing for 8-12 weeks (avascular necrosis risk with early loading)
• Simple fractures with stable fixation: May allow earlier protected weight-bearing

Daily Checks:

• Neurovascular status daily
• Wound inspection (if drainage concerning, unwrap for direct visualization)
• Pain control assessment and medication adjustment
• Mobilization progress
• VTE prophylaxis compliance

Discharge Criteria:

• Pain controlled on oral medications
• Mobilizing safely with appropriate walking aid
• Patient/family understand weight-bearing restrictions
• Patient can demonstrate crutch use correctly
• Wound satisfactory (dry, no excessive drainage or erythema)
• Neurovascular status stable
• VTE prophylaxis prescription provided
• Follow-up appointment arranged
• Emergency contact information provided

Outpatient Follow-up Protocol

2 Weeks Post-operative:

Clinical Assessment:

• Wound check
• Remove sutures or staples (if non-absorbable used)
• Assess for early complications:
• Superficial infection (erythema, drainage)
• Wound dehiscence
• DVT symptoms (calf pain, swelling)
• Nerve symptoms (numbness, weakness)

Management:

• If wound healing well: Remove sutures/staples, continue immobilization
• If wound concerns: Antibiotics if infection suspected, local wound care
• Continue non-weight bearing (or protocol-specific weight-bearing)
• Continue VTE prophylaxis if still indicated

6 Weeks Post-operative:

Clinical Assessment:

• Pain level and location
• Swelling
• Range of motion (for arthroplasty - NOT for arthrodesis)
• Neurovascular status
• Gait pattern if weight-bearing

Radiographic Assessment:

• AP and lateral ankle X-rays
• For arthrodesis: Look for bridging bone across fusion site, no lucency at interface
• For arthroplasty: Component position maintained, no subsidence or loosening, no radiolucent lines
• For fracture: Healing progression (callus formation), maintained reduction, no hardware failure

Decision Points:

• Arthrodesis:
• If bridging bone visible on 3 of 4 cortices: Progress to partial weight-bearing in boot
• If no bridging bone: Continue non-weight bearing, repeat X-rays at 8-10 weeks
• If concern for nonunion: Consider CT scan for better assessment
• Arthroplasty:
• If healing well: Progress weight-bearing per protocol, begin formal physiotherapy
• If component position concerns: Close monitoring, may need revision
• Fracture:
• If healing progressing: Begin protected weight-bearing
• If delayed union: Continue non-weight bearing, optimize bone health (vitamin D, calcium, smoking cessation)

3 Months Post-operative:

Clinical Assessment:

• Functional status (walking distance, activities of daily living)
• Pain (should be significantly improved)
• Swelling (should be resolving)
• Range of motion (for arthroplasty)
• Gait pattern

Radiographic Assessment:

• AP and lateral ankle X-rays
• Arthrodesis: Should demonstrate solid fusion
• If not fused: CT scan to assess fusion, consider revision with bone grafting
• Arthroplasty: Assess component position, rule out loosening
• Fracture: Should be healed or near-healed

Physiotherapy Progression:

• Arthroplasty: Range of motion exercises, strengthening, proprioception training
• Arthrodesis: Gait training, strengthening of surrounding joints (subtalar, midfoot)
• Fracture: Progressive weight-bearing, range of motion, strengthening

Return to Activities:

• Light activities typically allowed by 3 months
• Full return to activities 4-6 months

6-12 Months Post-operative:

Clinical Assessment:

• Final functional outcome assessment
• Patient satisfaction
• Return to work/activities status
• Any complications or concerns

Radiographic Assessment:

• Arthroplasty: Full recovery expected, ROM plateaus around 6 months
• Mean ROM 35-45 degrees (dorsi/plantarflexion arc)
• Arthrodesis: Fusion solid, gait normalized, assess for adjacent joint arthritis
• Fracture: Healed, assess for post-traumatic arthritis

Long-term Follow-up:

• Arthroplasty: Annual follow-up recommended for component surveillance
• Monitor for loosening, wear, subsidence
• Some registries recommend lifelong surveillance
• Arthrodesis: Discharge when stable unless symptomatic adjacent joint arthritis develops
• Fracture: Discharge when healed and functional recovery complete

This structured follow-up protocol ensures early detection and management of complications while optimizing functional recovery.

Early Complications (Less than 6 weeks)

Wound Complications:

Superficial Wound Infection:

• Incidence: 2-5%
• Presentation: Erythema, warmth, drainage, pain at incision site
• Diagnosis: Clinical appearance, elevated inflammatory markers (WBC, CRP, ESR)
• Management:
• Antibiotics (flucloxacillin 500mg PO QID OR cephalexin 500mg PO QID)
• Local wound care (daily dressing changes)
• If abscess present: Incision and drainage
• Usually resolves with oral antibiotics

Deep Infection:

• Incidence: 1-2% (higher in trauma, immunocompromised)
• Presentation: Wound drainage, systemic symptoms (fever, malaise), elevated inflammatory markers
• Diagnosis: Clinical plus elevated CRP/ESR, positive blood cultures, aspirate culture
• Management:
• Return to operating room for washout and debridement
• Deep tissue cultures
• Retain hardware/implants if stable and infection less than 6 weeks old
• IV antibiotics (guided by cultures, empiric: vancomycin plus ceftriaxone)
• Prolonged antibiotic course (6 weeks IV minimum)
• If implant loose or infection chronic: Remove implant, staged reconstruction

Wound Dehiscence:

• Incidence: 2-4%
• Risk factors: Diabetes, smoking, poor soft tissue quality, excessive swelling
• Management:
• Superficial (skin only): Local wound care, allow healing by secondary intention OR delayed primary closure
• Deep (exposing hardware/bone): Return to OR for debridement and re-closure, may require local flap if tissue quality poor

Nerve Injury:

Deep Peroneal Nerve Injury:

• Incidence: 1-3%
• Presentation: Foot drop (cannot dorsiflex ankle or extend toes), numbness first web space
• Diagnosis: Clinical examination, EMG/NCS at 6-8 weeks if not recovering
• Management:
• If neuropraxia (most common): Observe, most recover in 3-6 months
• AFO to prevent equinus contracture
• Physiotherapy for gait training
• If complete nerve transection: Consider nerve grafting (best results if performed within 6 months)
• Permanent injury: Long-term AFO, possible tendon transfers for foot drop

Superficial Peroneal Nerve Injury:

• Incidence: 3-5%
• Presentation: Numbness over dorsum of foot and lateral toes
• Diagnosis: Clinical examination, nerve conduction studies if needed
• Management:
• Observation (many improve over months)
• Desensitization if symptomatic
• If painful neuroma develops: Conservative (gabapentin, scar massage) OR surgical excision and burial

Vascular Injury:

• Incidence: Less than 1%
• Presentation: Absent dorsalis pedis pulse, cool pale foot, delayed capillary refill
• Management:
• Immediate recognition and management intra-operatively (as described in Structures at Risk section)
• Post-operative: Hourly neurovascular checks, Doppler assessment
• If perfusion concerns: Urgent vascular surgery consultation
• Monitor for compartment syndrome

DVT/PE:

• Incidence: Less than 1% with prophylaxis
• Risk factors: Prolonged immobilization, trauma, obesity, thrombophilia
• Diagnosis: D-dimer (if low suspicion), Doppler ultrasound (DVT), CT pulmonary angiogram (PE)
• Management:
• Therapeutic anticoagulation (rivaroxaban, apixaban, or enoxaparin)
• Inferior vena cava filter if anticoagulation contraindicated
• Duration: Minimum 3 months, longer if unprovoked

Late Complications (Greater than 6 weeks)

Nonunion (Arthrodesis):

• Incidence: 5-15% overall, up to 40% in smokers
• Risk factors: Smoking, diabetes, AVN, previous infection, inadequate fixation, poor bone quality
• Presentation: Persistent pain with weight-bearing, inability to progress to full weight-bearing
• Diagnosis:
• Radiographs: No bridging bone on 3 or more cortices, lucency at fusion site
• CT scan: Gold standard, shows lack of bridging bone in 3D
• Management:
• Asymptomatic nonunion: Observe (some patients functional despite radiographic nonunion)
• Symptomatic nonunion:
• Revision arthrodesis
• Debride fibrous tissue at nonunion site
• Bone grafting (autograft from iliac crest or proximal tibia preferred)
• Augmented fixation (blade plate or intramedullary nail for increased stability)
• Address risk factors (smoking cessation mandatory, optimize diabetes)

Component Loosening/Subsidence (Arthroplasty):

• Incidence: 10-15% at 10 years
• Risk factors: Poor bone quality, malalignment, obesity, high activity level
• Presentation: Pain with weight-bearing, swelling, decreased function
• Diagnosis:
• Radiographs: Radiolucent lines greater than 2mm around components, component migration on serial films
• Aspiration: Rule out infection (send for cell count, culture)
• Management:
• Aseptic loosening with good bone stock: Revision arthroplasty (exchange components, bone graft if defects)
• Aseptic loosening with poor bone stock: Salvage arthrodesis
• Septic loosening: Two-stage revision (explant, spacer, antibiotics, re-implant) OR arthrodesis

Post-traumatic Arthritis (Fracture ORIF):

• Incidence: 25-40% after pilon fractures despite anatomic reduction
• Risk factors: Articular step-off greater than 2mm, high-energy mechanism, cartilage damage at injury
• Presentation: Progressive pain, stiffness, swelling over 1-3 years post-injury
• Diagnosis: Radiographs showing joint space narrowing, osteophytes, subchondral sclerosis
• Management:
• Conservative: NSAIDs, intra-articular corticosteroid or hyaluronic acid injections, bracing, activity modification
• Surgical (if conservative fails):
• Ankle arthrodesis (reliable pain relief, no motion)
• Total ankle arthroplasty (preserves motion but higher failure rate in post-traumatic arthritis)

Chronic Pain and Stiffness:

• Incidence: Variable, 10-20%
• Causes: Scar tissue, adjacent joint arthritis, complex regional pain syndrome, nerve injury, hardware irritation
• Management:
• Physiotherapy (range of motion, desensitization)
• Pain management (multimodal analgesia, neuropathic pain medications)
• Hardware removal if prominent and symptomatic (after bone healing)
• CRPS treatment if diagnosed (physiotherapy, sympathetic blocks, medications)

Superficial Peroneal Nerve Neuroma:

• Incidence: 2-3% symptomatic
• Presentation: Painful scar, shooting pain with percussion (Tinel sign), numbness
• Diagnosis: Clinical examination, nerve conduction studies
• Management:
• Conservative: Desensitization, scar massage, gabapentin or pregabalin
• Surgical: Neuroma excision and nerve burial in muscle if conservative fails

Adjacent Joint Arthritis (Post-arthrodesis):

• Incidence: Increases over time, 20-30% at 10 years
• Affected joints: Subtalar, talonavicular (most common), midfoot
• Mechanism: Increased stress on adjacent joints from loss of ankle motion
• Presentation: Progressive pain in hindfoot or midfoot, years after successful arthrodesis
• Management:
• Conservative: NSAIDs, bracing, activity modification
• Surgical: Fusion of symptomatic adjacent joints (hindfoot fusion, pantalar fusion)

Prevention of complications relies on meticulous surgical technique, patient optimization, and appropriate post-operative care.

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