High-yield overview

The supine, subcutaneous workhorse exposure for unstable Weber B and Weber C ankle fractures and syndesmotic fixation

Weber BFracture at the syndesmotic level - the commonest operative pattern

SupineSandbag under the ipsilateral buttock to internally rotate the leg

No true planeDistal fibula is subcutaneous - no internervous plane distally

3.5 mmOne-third tubular or locking plate - lateral or posterolateral antiglide

Critical Must-Knows

The distal fibula is subcutaneous, so the standard distal exposure has NO true internervous plane - dissection is directly onto bone; the elegant peronei-versus-soleus plane belongs only to the proximal shaft extension.
The superficial peroneal nerve crosses the distal fibula subcutaneously in the distal third of the leg and is the critical anterolateral structure at risk - identify it with the foot plantarflexed and inverted and protect it in the anterior flap.
The sural nerve and short saphenous vein run together posterolateral to the lateral malleolus and are at risk with posterior dissection and posterolateral plating.
The peroneal tendons (brevis deep, longus superficial) lie in a shared sheath in the retrofibular groove - protect them and repair the sheath if it is opened.
A posterolateral antiglide (buttress) plate on the posterior surface resists proximal migration of the short distal fragment and is biomechanically stronger than a lateral neutralization plate.
The overriding goal is anatomic restoration of fibular length, rotation and alignment - shortening or external rotation lateralises the talus and causes early post-traumatic arthritis.

When & Why

What it exposes. The direct lateral approach gives subcutaneous, extensile access to the lateral column of the ankle - the distal fibula and lateral malleolus, the lateral ankle capsule, and the distal tibiofibular (syndesmosis) articulation. Because the distal fibula is subcutaneous, the approach reaches bone through skin, subcutaneous fat and deep fascia with minimal muscle dissection, and the same incision can be carried proximally onto the shaft. Why this approach. The lateral malleolus is the primary lateral stabiliser of the talus. Restoring fibular length, rotation and alignment is the cornerstone of unstable ankle fracture management, because any malreduction lateralises the talus in the mortise and precipitates early post-traumatic arthritis. The same exposure allows syndesmotic reduction and fixation under direct vision, and extends proximally for high (Weber C) fibular fractures. Primary indications: - Weber B (trans-syndesmotic) lateral malleolar fractures that are displaced or unstable - the commonest operative ankle fracture (supination-external rotation type IV pattern)

Weber C (suprasyndesmotic) fractures with fibular shortening and syndesmotic disruption (for example pronation-external rotation, Maisonneuve)
Bimalleolar and trimalleolar fractures requiring lateral column fixation as part of the construct
Syndesmotic disruption requiring open reduction and fixation
Open ankle fractures after formal debridement, when soft tissues permit Relative contraindications: - Compromised soft tissue envelope - significant fracture blisters (especially hemorrhagic), marked swelling, negative wrinkle test; delay definitive fixation until soft tissues recover
Low-energy, stable Weber B or supination-external rotation pattern without talar shift - many of these can be managed functionally (non-operative or in a protective boot) with equivalent outcome
Local soft tissue infection over the planned incision (operating through infected skin risks deep infection)
Medical unfitness for anaesthesia or non-weight-bearing rehabilitation Position & landmarks. Position the patient supine on a radiolucent table with a sandbag or roll under the ipsilateral buttock to internally rotate the leg and bring the subcutaneous border of the fibula to face anteriorly. Apply a thigh tourniquet (exsanguinate and inflate to around 250 to 300 mmHg, or use a tourniquet-free technique in marginal soft tissues). Confirm C-arm access from the opposite side and pad all pressure points. Palpate and mark the subcutaneous border of the fibula, the tip of the lateral malleolus, the lateral malleolar groove (where the peroneal tendons run posteriorly), and the anterior border of the distal tibia / joint line for syndesmotic screw orientation. The sandbag is removed (or the hip derotated) once the lateral malleolus is fixed, so the syndesmosis and medial side can be addressed with the leg neutral. Lateral decubitus is used instead when a true posterolateral plate or posterior malleolar fixation is planned; prone is rarely needed for isolated lateral malleolar fixation.

Why the ipsilateral buttock sandbag

The sandbag internally rotates the limb so the subcutaneous fibula faces anteriorly - this is what makes the lateral malleolus accessible through a direct incision in the supine patient. Remove it afterwards (or externally rotate) to bring the leg back to neutral for syndesmotic and medial work.

Incision planning. Plan a longitudinal incision over the subcutaneous border of the fibula, centred on the fracture site and extending approximately 1 to 2 cm beyond the proximal and distal extent of the fracture (typically 8 to 12 cm). For a posterolateral antiglide construct, place the incision slightly posterior to the subcutaneous border so the plate can lie on the posterior surface of the fibula. Avoid a right-angled hockey-stick around the tip of the malleolus (skin necrosis risk); if distal extension is needed, curve gently. Maintain a skin bridge of at least 5 to 7 cm between the lateral incision and any medial malleolar incision to protect flap vascularity. Approach variants.

Three variants of the lateral fibula exposure
Variant	Description	Typical use
Direct lateral	Longitudinal incision over the subcutaneous fibula	Standard for most Weber B and Weber C patterns
Posterolateral (curved)	Placed just behind the subcutaneous border, behind the lateral malleolus	Antiglide plating; oblique or short distal fragment; trimalleolar via one incision
Extended proximal (Henry)	Develops the peronei / soleus plane for the fibular shaft	High Weber C and shaft fractures

Fracture level dictates the approach. The Weber (Danis-Weber) classification stratifies lateral malleolar fractures by their relationship to the syndesmosis and so to syndesmotic stability.

Weber classification and syndesmotic implication
Type	Fibular level	Syndesmosis	Typical mechanism
A	Below the syndesmosis	Intact	Supination-adduction
B	At the syndesmotic level (oblique)	Variable - disrupted in a substantial proportion	Supination-external rotation
C	Above the syndesmosis	Disrupted	Pronation-external rotation / Maisonneuve

The Lauge-Hansen mechanistic patterns refine this further: supination-external rotation is the commonest mechanism (the classic Weber B spiral, with deltoid or medial malleolar injury and a possible posterior malleolus at stage IV); pronation-external rotation produces a Weber C pattern with sequential fibular fracture above the syndesmosis; supination-adduction gives a vertical medial malleolus with a low transverse fibula (Weber A); and pronation-abduction gives a transverse or oblique fibula at the syndesmotic level with comminution.

The Exposure

Work down through the layers directly onto the subcutaneous fibula, protecting the cutaneous nerves front and back, then - if a high fracture demands it - develop the peronei-versus-soleus internervous plane proximally. The overriding surgical goal throughout is anatomic restoration of fibular length, rotation and alignment, after which the syndesmosis is stress-tested and fixed if unstable.

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Image Needed: Clinical PhotoHigh Priority

Intra-operative photograph of the lateral approach to the distal fibula: a longitudinal incision over the subcutaneous border of the fibula, full-thickness flaps held with right-angle retractors, the superficial peroneal nerve protected in the anterior flap, and the distal fibular fracture exposed on bone ready for reduction.

Context: A verified image is being sourced for this exposure.

Pending image generation or sourcing

Exposure and fixation sequence

Step 1Position, mark and incise

Supine with a sandbag under the ipsilateral buttock to internally rotate the leg; thigh tourniquet at 250 to 300 mmHg; radiolucent table with C-arm from the opposite side.
Mark the subcutaneous border of the fibula, the tip of the lateral malleolus and the joint line; plan a longitudinal incision over the subcutaneous border, centred on the fracture, extending 1 to 2 cm beyond it (typically 8 to 12 cm).
For a planned posterolateral antiglide plate, place the incision slightly posterior to the subcutaneous border; keep a skin bridge of at least 5 to 7 cm to any medial incision.

Step 2Identify and protect the cutaneous nerves

With the foot plantarflexed and inverted, identify the superficial peroneal nerve where it tents the skin crossing the distal fibula in the distal third of the leg, and protect it in the anterior flap.
Note the short saphenous vein and sural nerve posterolaterally and keep them safe in the posterior flap if the incision is posterior.

Step 3Carry a single full-thickness flap to bone

Incise in one sweep through skin, subcutaneous tissue and deep fascia / periosteum of the fibula as a single full-thickness flap directly down to bone.
Do NOT create thin subcutaneous flaps - the distal fibula has a poor soft tissue blood supply and thin flaps necrose. The superficial peroneal nerve runs in the anterior flap and the sural nerve in the posterior flap; keep dissection strictly on bone to avoid them.

Step 4Open the deep fascia and peroneal sheath as needed

Incise the deep fascia in line with the incision to expose the fracture.
If the dissection is posterior (posterolateral plate), the peroneal tendon sheath is encountered behind the malleolus - open it only as much as needed and plan to repair it, because an unrepaired sheath allows peroneal tendon subluxation.

Step 5Expose the fracture site

Clear the haematoma and minimal periosteum at the fracture ends only - preserve soft tissue attachments to comminuted fragments (biological plating).
Define the proximal and distal fragments and the fracture geometry (spiral versus oblique versus transverse versus comminuted), which dictates the fixation strategy.

Step 6Deepen onto bone - there is no true plane distally

In the routine distal exposure, deepen directly onto the subcutaneous fibula - no intermuscular plane is developed.
Retract the anterior flap gently to expose the lateral and anterior surface, and the posterior flap to expose the posterior surface for a posterolateral plate.

Step 7Proximal extension (Weber C or shaft) - the internervous plane

To extend onto the fibular shaft, develop the true internervous plane between the peroneal muscles (peroneus longus and brevis - superficial peroneal nerve) anterolaterally and soleus (tibial nerve) posteromedially, dissecting subperiosteally along the posterior border of the fibula.
This is the same plane as the posterolateral approach to the tibia applied to the fibula - a safe inter-compartmental plane that does not denervate muscle.

Step 8Expose and reduce the syndesmosis

For syndesmotic reduction, clear the distal anterior tibiofibular ligament region and the incisura of clot and debris so the fibula can be reduced anatomically into the incisura under direct vision.
Clamp the reduced syndesmosis before definitive fixation.

Step 9Reduce the fibula - the key goal

Achieve anatomic restoration of length, rotation and alignment - the single most important goal. Use a pointed reduction clamp; for a spiral or long oblique fracture (Weber B), reduce with the clamp and confirm cortical read.
Resist accepting fibular shortening or external rotation malreduction, both of which lateralise the talus and cause post-traumatic arthritis.

Step 10Lag screw for oblique or spiral fractures

If the fracture is oblique or spiral and long enough (typically greater than two to three times the cortical diameter), place a 3.5 mm cortical lag screw perpendicular to the fracture line, outside or through the plate.

Step 11Apply the neutralization or antiglide plate

Apply a 3.5 mm one-third tubular or locking plate, engaging sufficient cortices on each side (typically six to eight cortices total) for stable fixation.
A posterolateral antiglide plate on the posterior surface resists proximal migration of the short distal fragment and is biomechanically stronger, especially in osteoporotic bone and short distal fragments; a lateral neutralization plate protects the lag screw. If posterior, repair the peroneal sheath as the plate sits in the retrofibular groove.

Step 12Assess and fix the syndesmosis

After fibular fixation, stress-test the syndesmosis (Cotton test or external rotation stress) and check the mortise on fluoroscopy.
If unstable, reduce it directly, hold with a clamp, and fix with one or two 3.5 mm cortical screws placed 1 to 2 cm proximal and parallel to the joint, engaging three or four cortices with the ankle in neutral dorsiflexion - or use a suture-button for dynamic fixation.

Step 13Closure and splint

Copious saline irrigation and meticulous haemostasis; repair the peroneal tendon sheath if it was opened (prevents subluxation).
Close the deep fascia loosely (do not strangulate swollen soft tissues), approximate the subcutis, and close skin; consider a drain only if there is marked dead space.
Apply a well-padded splint with the ankle in neutral. Confirm reduction, fibular length, syndesmotic congruity and hardware position on AP, mortise and lateral fluoroscopy - accept a congruent mortise with the talar dome centred and symmetric joint spaces.

Protect the superficial peroneal nerve at every step

The superficial peroneal nerve pierces the deep fascia in the distal third of the leg and crosses the distal fibula subcutaneously, only 2 to 3 mm deep, dividing into medial and intermediate dorsal cutaneous branches. It is the structure most often injured in this approach - injury causes numbness or a painful dysaesthetic neuroma of the dorsum of the foot. Identify it where it tents the skin (foot plantarflexed and inverted), keep it in a full-thickness anterior flap, and avoid blind anterior retraction.

State the plane correctly - a classic viva trap

The standard distal approach has no true internervous plane because the distal fibula is subcutaneous. The peronei (superficial peroneal nerve) versus soleus (tibial nerve) internervous plane is relevant only for the proximal shaft extension. Stating the wrong plane is a common viva error - examiners are testing whether you understand that the elegant plane belongs to the proximal Henry extension, not the routine distal exposure.

Dangers & Extensions

Structures at risk, by layer

Danger structures and how to protect them
Layer	Structure at risk	Protection
Subcutaneous	Superficial peroneal nerve (crosses distal fibula in distal third of leg)	Identify with the foot plantarflexed and inverted; keep in a full-thickness anterior flap; no blind anterior retraction
Subcutaneous	Sural nerve with the short saphenous vein (posterolateral to the malleolus)	Keep the posterior limb of the flap full thickness; dissect posteriorly only when a posterolateral plate is required
Deep fascia / sheath	Peroneal tendons (brevis deep, longus superficial) and their sheath	Open the sheath only as much as needed; repair it at closure to prevent subluxation
Bone / deep	Perforating branch of the peroneal artery (crosses anteriorly near the syndesmosis)	Control with diathermy if encountered; stay on bone
Articular / syndesmosis	Anterior inferior tibiofibular ligament and deltoid ligament	Restore rather than strip the syndesmotic ligaments during reduction

The deep peroneal nerve and anterior tibial artery lie well anteriorly and are only at risk if dissection strays far anteriorly across the syndesmosis. Nerve injury management: if a nerve is transected and recognised intra-operatively, primary repair or grafting may be considered; a suspected neuropraxia (no cut nerve seen) is documented and usually recovers observationally; a painful established neuroma may require later neurolysis, excision and burial, or referral to a peripheral nerve surgeon.

Soft tissue timing determines the wound outcome

The distal fibula is subcutaneous with a precarious soft tissue envelope, so timing matters as much as fixation. Operate through swollen, blistered skin only when necessary - it markedly increases wound breakdown and deep infection. Wait for the wrinkle sign to be positive (skin wrinkles when compressed, indicating adequate dermal perfusion), usually 5 to 14 days. Distinguish serous blisters (superficial, can often proceed once re-epithelialised) from hemorrhagic blisters (deeper dermal injury - delay until healed). For a markedly unstable or subluxed ankle in the interval, splint in neutral and elevate, or apply a temporary spanning external fixator. When ready, plan the incision through healthy skin and avoid incising through a blister.

Flap handling. Make single full-thickness flaps directly to bone - never thin subcutaneous flaps. Use the knife or diathermy to bone in one sweep, avoid repeated dissection in the fat, retract gently with right-angle retractors (releasing periodically), and maintain a skin bridge of at least 5 to 7 cm to any medial incision. Extensile options. - Proximal extension: continue along the subcutaneous or posterior border of the fibula and develop the peronei-versus-soleus internervous plane for high Weber C and shaft fractures.

Distal extension: curve gently around the malleolus for peroneal tendon work, lateral ligament (Brostrom) reconstruction, or access to the lateral process of the calcaneus.
Combined posterior malleolus: a posterolateral plate can capture a posterior malleolar fragment through the same incision in trimalleolar injuries. Closure. Irrigate and achieve haemostasis; repair the peroneal tendon sheath if opened; close the deep fascia loosely with absorbable suture (do not strangulate swollen soft tissues); approximate the subcutis and close skin (interrupted non-absorbable, or absorbable subcuticular); consider local anaesthetic infiltration and a drain only for marked dead space; apply a well-padded splint with the ankle in neutral.

Procedures Through This Approach

ORIF of the lateral malleolus for Weber B and Weber C fractures - the principal use of this exposure.
Open reduction and fixation of the syndesmosis after direct reduction into the incisura.
Combined fixation of the posterior malleolus through a posterolateral extension or plate (trimalleolar injuries).
Fibular lengthening or reconstruction in delayed or missed fractures.
Peroneal tendon work, lateral ligament (Brostrom) reconstruction, and access to the lateral process of the calcaneus via distal extension.

Lateral neutralization plate versus posterolateral antiglide plate
Parameter	Lateral neutralization plate	Posterolateral antiglide plate
Position	Direct lateral surface of the fibula	Posterior surface of the distal fibula
Biomechanics	Neutralizes the lag screw	Buttress or antiglide - resists proximal migration of the distal fragment
Strength	Weaker in osteoporotic bone	Superior resistance to shortening and rotation
Best for	Simple transverse or short oblique patterns	Oblique or short distal fragment, osteoporotic bone, trimalleolar via one incision
Tendons	Less peroneal irritation	Plate sits in the peroneal groove - may irritate tendons; sheath repair important

Viva & Exam Focus

The direct lateral approach to the fibula and lateral malleolus is the workhorse exposure for unstable ankle fractures (Weber B and C, bimalleolar and trimalleolar) and for syndesmotic fixation. The patient is supine with a sandbag under the ipsilateral buttock to internally rotate the limb. Because the distal fibula is subcutaneous, the standard distal exposure has no true internervous plane; the true plane (peronei supplied by the superficial peroneal nerve versus soleus supplied by the tibial nerve) is developed only for the proximal shaft extension. The critical nerves at risk are the superficial peroneal nerve anterolaterally and the sural nerve with the short saphenous vein posterolaterally; the peroneal tendons lie posteriorly in a shared sheath and must be protected and repaired if opened. The overriding goal is anatomic restoration of fibular length, rotation and alignment, after which the syndesmosis is stress-tested and fixed if unstable; a posterolateral antiglide plate is biomechanically superior to a lateral neutralization plate.

Mnemonic

LATERALLATERAL — the surgical sequence

Longitudinal incision

Over the subcutaneous fibula, centred on the fracture

Anterior nerve protected

Superficial peroneal nerve kept in the anterior flap

Tendons posteriorly

Peroneal tendons and sural nerve safe behind the malleolus

Expose to bone

Single full-thickness flap, no thin bridges

Reduce length and rotation

Anatomic fibular reduction - the key goal

Apply plate

Posterolateral antiglide or lateral neutralization

Layered closure

Repair the peroneal sheath, then fascia, subcutis, skin

Mnemonic

DANGERDANGER — structures at risk

Direct subcutaneous bone

The distal fibula has no true internervous plane

Anterior - superficial peroneal nerve

Crosses the distal fibula in the distal third of the leg

Nerve (sural) plus short saphenous vein

Posterolateral to the lateral malleolus

Guard the peroneal tendons

Brevis and longus behind the malleolus - repair the sheath

Evaluate the syndesmosis

Stress-test and fix if unstable

Restore fibular length and rotation

Determines talar mortise congruity

Exam Viva Scenarios

Practise clinical reasoning and management decisions out loud

Viva scenarioStandard

Clinical prompt

“A 52-year-old twists their ankle down stairs. Radiographs show a displaced Weber B lateral malleolar fracture with talar shift and a medial clear space of 5 mm. Describe your approach and fixation.”

Practical approach

This is an unstable supination-external rotation type IV (Weber B) ankle fracture with talar shift and deltoid incompetence (widened medial clear space) - an absolute indication for ORIF. Confirm the pattern on AP, mortise and lateral radiographs, assess the posterior malleolus (CT if it is large or the pattern is unclear), and document neurovascular status and the soft tissue envelope including the wrinkle sign. Position supine with a sandbag under the ipsilateral buttock to internally rotate the limb and a thigh tourniquet; make a longitudinal incision over the subcutaneous border of the fibula centred on the fracture. Protect the nerves - identify the superficial peroneal nerve crossing the distal fibula in the distal third of the leg and keep it in a full-thickness anterior flap, and keep the sural nerve and short saphenous vein safe posterolaterally. Deepen directly to bone in a single full-thickness flap (no true internervous plane distally). Restore fibular length, rotation and alignment with a pointed clamp using cortical read. The spiral or oblique Weber B fracture gets a 3.5 mm lag screw perpendicular to the fracture line, then a one-third tubular neutralization plate laterally or a posterolateral antiglide plate (biomechanically stronger, especially in osteoporotic bone). Stress-test the syndesmosis after fixation and fix if unstable. Close in layers, repairing the peroneal sheath if opened, and splint in neutral.

Key clinical points

Unstable Weber B / supination-external rotation IV with talar shift is an absolute indication for ORIF

Supine with an ipsilateral buttock sandbag to internally rotate the leg

Superficial peroneal nerve protected anteriorly; sural nerve and short saphenous vein posterolaterally

No true internervous plane distally - single full-thickness flap to bone

Restore fibular length, rotation and alignment with cortical read

Lag screw plus a lateral neutralization or posterolateral antiglide plate

Stress-test and fix the syndesmosis if unstable

Layered closure with peroneal sheath repair if opened

Common pitfalls

Forgetting to protect the superficial peroneal nerve in the anterior flap

Accepting fibular shortening or external rotation malreduction

Not stress-testing the syndesmosis after fibular fixation

Creating thin subcutaneous flaps that risk wound necrosis

Further questions

“How would your fixation change if the posterior malleolus involved greater than 25 percent of the joint?”

Viva scenarioChallenging

Clinical prompt

“A 34-year-old sustains a pronation-external rotation injury. Radiographs show a high fibular fracture (Weber C) with a widened tibiofibular clear space and medial soft tissue swelling. How do you plan and execute surgery?”

Practical approach

This is a Weber C with syndesmotic disruption (widened clear space) and probable deltoid injury - an unstable injury requiring ORIF. The fibular fracture is above the syndesmosis, so the syndesmosis is disrupted and the fibula is shortened. Obtain a CT if the syndesmotic reduction is unclear or a posterior malleolus is present, and assess the proximal fibula on full-leg films to exclude a Maisonneuve pattern. Position supine with an ipsilateral buttock sandbag; the incision may need to extend proximally onto the shaft, developing the internervous plane between the peronei (superficial peroneal nerve) and soleus (tibial nerve) along the posterior border of the fibula. Restore fibular length first - the hard part in Weber C: use a reduction clamp, distractor or plate to regain length and rotation, because the distal fragment is short and externally rotated. Apply a long one-third tubular or locking plate with a lag screw if the fracture line suits. For the syndesmosis, clear the incisura of clot, reduce the fibula anatomically under direct vision, clamp, and confirm a congruent mortise on fluoroscopy. Fix with one or two 3.5 mm cortical screws 1 to 2 cm above and parallel to the joint, engaging three or four cortices with the ankle in neutral dorsiflexion, or a suture-button. Reassess the reduction on intra-operative CT if available, as malreduction is common and poorly tolerated.

Key clinical points

Weber C implies syndesmotic disruption and fibular shortening - restore length first

Proximal extension uses the peronei-versus-soleus internervous plane

Regaining length and rotation in a short distal fragment is the technical challenge

Reduce the syndesmosis under direct vision - clear the incisura of clot

3.5 mm screws engaging three or four cortices, 1 to 2 cm above the joint, ankle neutral

A suture-button is a dynamic alternative to screws

Syndesmotic malreduction is a leading cause of poor outcome - recheck on imaging

Exclude a proximal (Maisonneuve) fibular fracture with full-leg films

Common pitfalls

Failing to restore fibular length before fixing the syndesmosis

Placing the syndesmotic screw too close to the joint or not parallel to it

Fixing the foot in plantarflexion, which can narrow the mortise

Not recognising a proximal Maisonneuve fibular fracture

Further questions

“Do you routinely remove syndesmotic screws, and why?”

Viva scenarioChallenging

Clinical prompt

“A patient has a closed bimalleolar ankle fracture with marked swelling and hemorrhagic fracture blisters over the lateral malleolus. How does this change your management?”

Practical approach

Hemorrhagic blisters and marked swelling indicate a high-energy soft tissue injury with dermal-epidermal separation; operating through this skin dramatically increases wound breakdown and deep infection. Because the subcutaneous fibula has poor soft tissue cover, timing is critical. Examine the whole circumferential soft tissue envelope, distinguish serous (superficial) from hemorrhagic (deeper) blisters, and check the wrinkle sign (skin wrinkles when compressed - positive means safe to operate). Splint the ankle in neutral, elevate the limb above heart level, and apply a temporary spanning external fixator if the fracture is markedly unstable or the talus is subluxed. Delay definitive fixation until the wrinkle sign is positive and the blisters have re-epithelialised (typically 5 to 14 days). Once soft tissues recover, proceed with the standard lateral approach using full-thickness flaps and protecting the superficial peroneal and sural nerves; plan the incision through healthy skin and avoid incising through a blister. Counsel the patient about the reason for delay and the staged plan, as patients can misread a delay as neglect.

Key clinical points

Hemorrhagic blisters and swelling signal high-energy soft tissue injury

The subcutaneous fibula has poor cover - timing determines the wound outcome

Delay surgery until the wrinkle sign is positive (usually 5 to 14 days)

Use a temporary splint or spanning external fixator for unstable injuries

Elevate the limb and re-assess serially

When ready, use single full-thickness flaps and protect both nerves

Avoid incising through a blister; plan the incision through healthy skin

Counsel the patient about the staged plan

Common pitfalls

Operating through swollen, blistered skin (high infection and necrosis risk)

Not using a spanning external fixator for an unstable, subluxed ankle

Confusing serous with hemorrhagic blisters when judging readiness

Failing to counsel the patient about the reason for delay

Further questions

“What is the wrinkle sign, and how do you test it?”

Exam day cheat sheet

Lateral approach to the fibula and lateral malleolus - exam-day essentials

Patient position

Supine with a sandbag under the ipsilateral buttock to internally rotate the leg
Thigh tourniquet at 250 to 300 mmHg; radiolucent table with C-arm access
Remove the sandbag afterwards for syndesmotic and medial work
Lateral decubitus for a true posterolateral plate or posterior malleolar fixation
Pad all pressure points

Danger structures

Superficial peroneal nerve - crosses the distal fibula in the distal third of the leg, anterior flap
Sural nerve with the short saphenous vein - posterolateral to the lateral malleolus
Peroneus brevis and longus tendons - retrofibular groove, posterior to the malleolus
Perforating branch of the peroneal artery - anterior, near the syndesmosis
Deep peroneal nerve and anterior tibial artery - only if dissection strays far anteriorly

Internervous plane

Distal approach has NO true internervous plane - the fibula is subcutaneous
Proximal shaft extension: peronei (superficial peroneal nerve) versus soleus (tibial nerve)
Dissect along the posterior border of the fibula, subperiosteally
Single full-thickness flap directly to bone distally
Retract rather than split muscle

Fixation principles

Anatomic restoration of fibular length, rotation and alignment is the key goal
Lag screw for long oblique or spiral fractures (Weber B)
3.5 mm one-third tubular or locking plate - six to eight cortices total
Posterolateral antiglide plate is biomechanically stronger than a lateral plate
Stress-test the syndesmosis after fixation; fix if unstable
Syndesmotic screws 1 to 2 cm above and parallel to the joint, three or four cortices, ankle neutral

Extensions

Proximal: along the fibula using the peronei-versus-soleus plane for Weber C or shaft
Distal: gentle curve around the malleolus for peroneal tendon or lateral ligament work
Posterior: a posterolateral plate can capture a posterior malleolar fragment
Maintain a skin bridge of at least 5 to 7 cm to any medial incision
Avoid sharp hockey-stick angles around the malleolus

Closure and complications

Repair the peroneal tendon sheath if opened (prevents subluxation)
Layered closure: fascia, subcutis, skin; splint in neutral
Superficial peroneal or sural nerve injury - neuroma and numbness
Wound breakdown and infection higher with poor soft tissue timing
Syndesmotic malreduction and fibular malunion cause post-traumatic arthritis

References

Ankle fractures are among the commonest operatively treated fractures worldwide, and the principles of the lateral approach converge across examination systems (advanced orthopaedic practice and advanced orthopaedic practice, DNB and MS, MRCS, SICOT). Restoration of fibular length and rotation, anatomic mortise reduction, syndesmotic stability and meticulous soft tissue handling are universal goals. Side-by-side principles (where guidance converges): | Body | Position on ankle fracture management | |------|---------------------------------------| | AO Foundation | Anatomic reduction of the lateral column and syndesmosis; lag screw plus neutralization or antiglide plating; syndesmotic fixation only when instability is confirmed by intra-operative stress testing | | BOA / BOAST (ankle) | Document neurovascular status and soft tissue condition; consider staged fixation for severe soft tissue injury; image and reduce the syndesmosis anatomically | | OTA / AAOS | Distinguish stable from unstable patterns (talar shift, deltoid injury, bimalleolar or trimalleolar) as the key decision point; surgery for unstable injuries | Registry and population evidence. Ankle fractures have a bimodal distribution - high-energy injuries in younger men and low-energy (fragility) injuries in older women, with a rising incidence in the elderly. Unstable patterns (bimalleolar, trimalleolar, Weber C, Weber B with talar shift) have substantially better outcomes after anatomic ORIF than after non-operative treatment. In high-resource settings, pre-contoured locking plates, suture-button syndesmotic devices and routine intra-operative imaging are standard; in resource-limited settings the same biomechanical principles are achieved with one-third tubular plates and cortical syndesmotic screws, and external fixation has a larger role for temporary and occasionally definitive stabilisation. Consent (globally applicable). Discuss superficial peroneal or sural nerve injury with possible numbness or painful neuroma, wound problems and infection (higher with compromised soft tissues), syndesmotic malreduction, hardware prominence or irritation, the possible need for syndesmotic screw removal, and post-traumatic arthritis.

Evidence

Fractures of the Ankle: A Combined Experimental-Surgical and Experimental-Roentgenologic Investigation

LoE 4

Lauge-Hansen N • Archives of Surgery (1950)

Key Findings:

Established the mechanism-based Lauge-Hansen classification of ankle fractures from cadaveric experiments
Defined the four major patterns (supination-adduction, supination-external rotation, pronation-abduction, pronation-external rotation) by sequential failure of structures
Identified supination-external rotation as the commonest ankle fracture mechanism
Linked each mechanism to a characteristic sequence of bony and ligamentous injury that guides reduction and fixation

Evidence

A Prospective, Randomized Study of the Management of Severe Ankle Fractures

LoE 2

Phillips WA, Schwartz HS, Keller CS, Woodward HR, Rudd WS, Spiegel PG, Laros GS, Citrone JP, Capps M • Journal of Bone and Joint Surgery (American) (1985)

Key Findings:

Prospective randomized comparison of operative versus closed treatment of severe (displaced) ankle fractures
Operative fixation gave better anatomical and functional results for unstable fracture patterns
Accuracy of reduction was the principal determinant of outcome
Supported operative fixation for displaced, unstable ankle fractures such as bimalleolar and trimalleolar injuries

Evidence

Operative Treatment of Ankle Fracture-Dislocations

LoE 3

Lindsjo U • Acta Orthopaedica Scandinavica (1981)

Key Findings:

Large operative series establishing principles of ORIF for ankle fracture-dislocations
Emphasised anatomic reduction and stable internal fixation of the lateral malleolus and syndesmosis
Linked residual displacement and shortening of the fibula to poorer outcome
Provided outcome benchmarks that informed modern ankle fracture management

Evidence

Weight-Bearing After Operative Fixation of Ankle Fractures

LoE 2

Hoshino CM, Do HT, Wechter JC, Uhlig C, DiGiovanni CW • Journal of Bone and Joint Surgery (American) (2012)

Key Findings:

Studied early weight-bearing after stable fixation of supination-external rotation type IV (Weber B) ankle fractures
Early protected weight-bearing was not detrimental and did not increase loss of fixation or need for revision
Supported accelerated rehabilitation after stable lateral malleolar fixation
Informed modern post-operative weight-bearing protocols

Evidence

The Antiglide Plate for Distal Fibular Fixation

LoE 4

Schaffer JJ, Manoli A 2nd • Foot and Ankle (1987)

Key Findings:

Described the posterolateral antiglide (buttress) plate for unstable distal fibular fractures
The plate on the posterior surface resists proximal migration of the short distal fragment
Provides a biomechanical rationale favouring a posterolateral antiglide plate over a lateral neutralization plate
Particularly advantageous for short distal fragments and osteoporotic bone