Total Talar Dislocation

Total talar dislocation is an extremely rare but serious injury in which the talus is completely dislocated from all its articulations: the ankle (tibiotalar), subtalar (talocalcaneal) and talonavicular joints. It needs urgent reduction, carries a high risk of AVN, and the outcome is poor because of that AVN risk.

Mechanism. High-energy trauma, from motor vehicle accidents and falls from height; sports injuries are also described. Extreme rotation, translation and axial loading disrupt every ligament and capsule around the bone.

Who. The peak is at 20-40 years, the trauma population, with no clear predominance of either sex. The injury makes up less than 0.1% of dislocations. Talar fractures and open wounds are the associated injuries, and they define the patterns under Classification.

Articulations. The talus meets the tibia and fibula at the ankle, the calcaneus at the subtalar joint and the navicular at the talonavicular joint. A total dislocation leaves all three.

Blood supply. Three arteries reach the talus:

• Posterior tibial artery, through the artery of the tarsal canal, supplying most of the talar body
• Anterior tibial artery (dorsalis pedis), supplying only the neck and head
• Peroneal artery, through the artery of the tarsal sinus, forming an anastomotic sling beneath the body

The supply is tenuous: 60% articular cartilage and no muscle attachments.

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Why AVN risk is high. A complete dislocation disrupts the whole supply at once, in a bone whose supply is already tenuous. Prolonged dislocation is listed as a further risk factor, although whether timing changes AVN in this injury has never been tested (see Controversies).

The injury is described by its pattern, by whether it is open, and by the direction of dislocation. The pattern guides the treatment.

Open or closed. A closed injury, skin intact, has the better prognosis. An open injury needs urgent debridement as well as reduction, carries a higher infection risk and has worse outcomes.

Direction. Lateral dislocation is the most common, medial less common and anterior rare. The direction guides the reduction manoeuvre.

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History. Severe ankle and foot pain after high-energy trauma, with an obvious deformity and inability to bear weight.

Examination. Look for deformity, swelling, an open wound and skin tenting, which calls for urgent reduction. The ankle and foot are tender, with crepitus if there are fractures, and range of motion is limited, painful and cannot be tested for pain.

Neurovascular status. Record it before reduction, which is critical for both clinical and medicolegal reasons, and repeat it afterwards:

• Pulses - dorsalis pedis and posterior tibial
• Sensation - dorsal and plantar foot
• Motor - ankle dorsiflexion and plantarflexion

Radiographs. Three views, but do not delay reduction for imaging if the skin is compromised:

• AP - the dislocation, the position of the talus and any fracture
• Lateral - the direction of dislocation, the position of the talus and any fracture
• Mortise - mortise alignment and the position of the talus

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CT after reduction. Recommended once the talus is back in place. 60-80% have associated talar fractures, and CT shows the fracture pattern, displacement and joint congruity, which is what ORIF is planned from; it also checks the quality of the reduction.

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The key exam discriminator is between total (pan-talar) dislocation and the more common partial peritalar injuries. How many of the three articulations are dislocated, and whether the talus keeps its tibiotalar relationship, guides both the terminology and the treatment.

The sequence. Reduction comes first and fixation second:

1. Assess - diagnose clinically and radiographically, and document neurovascular status
2. Reduce - within hours, closed, under sedation or general anaesthesia; closed reduction is quoted as succeeding in 60-70%
3. CT - to assess talar fractures and plan fixation
4. ORIF - for displaced fractures, restoring joint congruity; the quoted success rate is 50-70% due to the high AVN risk

Non-operative treatment. Rare. It suits the pure dislocation that is stable after reduction with no displacement: a short leg cast or boot, non-weight-bearing for 8-12 weeks, and serial radiographs to monitor for AVN. Good results are typical when AVN does not develop, but that is conventional teaching and no cited series validates a rate.

Surgical indications. Surgery is needed in most cases, after reduction and within 1-2 weeks.

Absolute

• Associated talar fractures with displacement
• Unstable after reduction
• Open injury

Relative

• Large talar body fractures
• Joint incongruity

ORIF of the talus. For displaced talar fractures with the dislocation, or a talus unstable after reduction. The approach follows the fracture: anterior for the talar neck, medial or lateral for the body, and dual incisions if needed.

1. Exposure - by fracture location, protecting the neurovascular structures
2. Reduction - anatomic, to restore joint congruity
3. Fixation - 3.5-4.5mm screws or a plate
4. Verification - fluoroscopic confirmation of reduction, hardware position and restored joint congruity

ORIF restores joint congruity, prevents arthritis and allows early motion.

Salvage. For AVN with collapse, severe arthritis or failed ORIF:

• Tibiotalar fusion - ankle fusion
• Tibiocalcaneal fusion - ankle and subtalar fusion
• Talar replacement - rare and experimental

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Why the talus buttonholes. In a total (pan-talar) dislocation the extruded talus commonly buttonholes through a rent in the capsule, retinaculum or skin, and tendons and the neurovascular bundle can become interposed around its neck. Once the bone has herniated through a soft-tissue defect, longitudinal traction alone tends to tighten the noose of soft tissue around it rather than let it slip back. That is why forced closed manipulation so often fails, and why many published series ultimately required open reduction.

One gentle attempt, then open reduction. A single gentle closed attempt followed by prompt open reduction is widely advocated:

1. Optimise conditions - procedural sedation or general anaesthesia with full muscle relaxation, and the knee flexed to relax the gastrocnemius so the ankle can be dorsiflexed and the mortise opened
2. One controlled attempt - longitudinal traction to re-establish length, then reverse the displacement according to the direction of dislocation, with an assistant providing counter-traction and, where relevant, direct thumb pressure over the prominent talus
3. Do not repeat forceful attempts - each one risks further stripping of the already tenuous blood supply and worsening of the soft-tissue and skin injury
4. Open reduction - promptly, by extending the traumatic wound in open injuries or through a standard anteromedial or anterolateral exposure, releasing the interposed structures under direct vision

Check every joint. After reduction, confirm the talonavicular, subtalar and tibiotalar relationships one by one rather than accepting mortise alignment alone.

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Do not discard the extruded talus. Even a grossly contaminated, fully extruded talus should be retained. Discarding it commits the patient to a large bone-stock deficit; keeping it preserves length and bone stock for reimplantation and for any later arthrodesis, and published series report acceptable function after reimplantation when debridement is thorough. Deep infection still occurs, and in the open injuries it is infection that drives secondary surgery (see Outcomes).

Retrieve, clean, reimplant.

1. Debride and irrigate - meticulous excision of contaminated and devitalised tissue, copious pulsatile lavage of the wound and the extruded bone, tissue sent for culture, IV antibiotics on the open-fracture pathway (early broad-spectrum cover, tetanus prophylaxis) and combined orthoplastic planning
2. Reimplant immediately - replace the talus in its bed
3. Stabilise - reported constructs use Kirschner wires or Steinmann pins passed through the calcaneus into the talus and tibia, protected by a spanning calcaneo-tibial external fixator, which holds alignment while the soft-tissue envelope recovers and avoids extensive internal dissection that would further devascularise the bone
4. Follow the AVN pathway - as under Complications

Counselling. Infection and osteonecrosis remain difficult to predict at presentation despite optimal care. Even if AVN later supervenes, the retained talus still provides bone stock for salvage arthrodesis.

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AVN. A complete extrusion avulses the extraosseous supply: the artery of the tarsal canal, the deltoid branch and the dorsalis pedis contributions all tear. Prevention is early reduction and avoiding further stripping at reimplantation.

Monitoring for AVN.

• Hawkins sign at 6-8 weeks - subchondral lucency indicates preserved vascularity and is reassuring; its absence is less specific
• MRI if in doubt
• Eight weeks is too early to exclude osteonecrosis

Managing AVN. Protect weight-bearing. Radiographic AVN without collapse is compatible with a functioning ankle and is not in itself an indication to fuse.

Post-traumatic arthritis. No reliable incidence exists for this injury: the carded series report subtalar arthritis and secondary fusion individually rather than an arthritis rate, and follow-up is under two years in two of them. The causes are AVN, cartilage injury at the moment of dislocation and residual incongruity, and anatomic reduction is the prevention. Severe arthritis is fused, subtalar or tibiotalar; arthroplasty is rarely appropriate in a talus that has been extruded.

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Immobilisation. A short leg cast or boot, non-weight-bearing for 8-12 weeks, then physiotherapy for ankle range of motion and strengthening.

• Weeks 0-8 - cast or boot, non-weight-bearing, elevation to reduce swelling; ankle range-of-motion exercises if stable, otherwise after cast removal
• Weeks 8-12 - CT to confirm healing and a check for the Hawkins sign; if healing, remove the cast, move to a walking boot and progress weight-bearing
• Weeks 12-16 - full weight-bearing and progressive activity, with continued AVN monitoring

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What the carded evidence reports. Every published series of this injury is tiny, so the honest way to present outcome is to show all of them rather than quote a range. These are the four series carded in the Evidence Base below: 21 patients in total, worldwide, across 33 years.

The quoted figure. "AVN 50-100%" is quoted everywhere in the literature, with "70-90%" for open injuries, yet the only two series of open extrusion carded here report AVN in 1 of 9 and 1 of 6. The teaching figure is four to eight times the observed one.

Why 19% is no better. Do not simply replace one number with the other; the pooled figure is also unreliable, in the opposite direction:

• Follow-up is far too short. Karampinas 21.1 months, Veselý 24.2 months. Talar osteonecrosis declares itself over years, and revascularisation may be incomplete long after a radiograph looks acceptable. Ritsema, the series with the longest follow-up at 4.5 years, has the highest AVN rate at 40%, which is what you would expect if the short series are simply looking too early. Eda's MRI was at eight weeks, far too early to exclude anything.
• Definition varies. Radiographic sclerosis, absent Hawkins sign, MRI signal change and symptomatic collapse are not the same endpoint, and no two of these papers define AVN identically.
• Publication favours success. A unit that reimplanted a talus and watched it die is less likely to publish than one that saved it.

Risk factors. Prolonged dislocation, complete extrusion, open injury and infection. Frequently quoted figures come from heterogeneous small series with wide confidence intervals and selection bias toward published cases, so quote them as estimates and emphasise the trend: open and prolonged-dislocation injuries do worse.

The defensible position for an exam or a consent discussion. Osteonecrosis is common, reported in roughly one in five to two in five patients in the small published series, with a real possibility that longer follow-up would raise that. Radiographic osteonecrosis is not the same as clinical failure, since several patients in these series had radiographic AVN with a functioning ankle. In the open injuries the outcome that actually drives secondary surgery is infection, not AVN.

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There are no condition-specific society guidelines for total talar dislocation given its rarity; management is extrapolated from talar fracture-dislocation principles and open-fracture guidance. Below is the global picture and how core principles are framed across societies.

Global Epidemiology

• Rarity: Total (pan-talar) dislocation accounts for roughly 3.4% of major talar injuries and is itself a small fraction of all foot/ankle trauma (Johnson et al, 2012 - a figure inherited from earlier literature rather than measured, against an undefined denominator).
• Open predominance: A high proportion present open (historically quoted around 70% in case reviews), reflecting the high-energy mechanism.
• Demographics: Predominantly young adults (20-40 years) after motor-vehicle trauma, falls from height or high-energy sport.
• Pooled outcome trend: Across the four small series carded above - 21 patients in total - osteonecrosis occurred in 4, deep infection in 4 of the 15 open injuries, and 4 needed a secondary fusion. Follow-up is under two years in two of the series, and the one followed longest reports the highest osteonecrosis rate, so read these as a floor rather than an estimate.

Guidance Framed by Society / System

Registry Notes

No arthroplasty or implant registry (NJR, AJRR, AOANJRR, SHAR) tracks this injury, as treatment is reduction and fixation rather than joint replacement. Emerging custom total talar prostheses for talar collapse are reported chiefly from Japanese centres and are not yet captured by mainstream registries; cadaveric data flag anterior instability and dislocation of downsized implants (Sato et al, 2021).

High- vs Limited-Resource Practice

• Well-resourced settings: Immediate ortho-plastic care, external fixation, CT planning, MRI for AVN surveillance, and access to delayed reconstruction/arthrodesis or custom prostheses.
• Limited-resource settings: Emphasis on prompt reduction, K-wire stabilisation and external fixation, vigilant infection control, and arthrodesis as the principal salvage; advanced reconstruction may be unavailable.

Related pages: Talus Fractures and Talar Body Fractures carry the Hawkins classification, the blood supply and the osteonecrosis evidence this injury borrows from - and the borrowing must be done carefully, since displacement stratifies risk in a fracture and cannot in a complete dislocation; Subtalar Dislocations is the far commoner injury this must be distinguished from, where the talus stays in the mortise and the foot displaces beneath it, and is the discriminator every viva on this topic turns on; Lateral Process Talus Fractures and Posterior Process Talus Fractures are the associated injuries a post-reduction CT is looking for; Open Fracture Management governs the debridement, antibiotic timing and ortho-plastic planning for the extruded talus, which is the pathway that most determines outcome here; Osteochondral Lesion of the Talus and Subtalar Arthritis cover the late cartilage consequences; Ankle Fractures and Pilon Fractures are the high-energy differentials on the initial radiograph; and Compartment Syndrome of the Leg because the mechanism that extrudes a talus is energetic enough to demand the leg be assessed as well as the hindfoot.

The injury is rare and the evidence is limited to small retrospective series, so several management questions remain genuinely unsettled.

Reimplantation or primary talectomy in the open injury. Older teaching favoured discarding a fully extruded, contaminated talus. Contemporary series (Karampinas, Veselý) show that immediate reimplantation can achieve good function and preserves bone stock for later fusion. Most authors now favour reimplantation even when AVN later supervenes, reserving primary talectomy for catastrophic contamination or unreconstructable bone, and talectomy for failed salvage.

Does reduction timing change AVN? For talar neck fractures, Clare and Maloney conclude that initial displacement, not the timing of definitive fixation, drives osteonecrosis. Be careful transporting that here. In a neck fracture the vascular injury is proportional to displacement, which is why displacement stratifies risk and timing does not; in a total dislocation the extraosseous supply is avulsed completely at the moment of injury, displacement is total in every case and cannot stratify anyone, and nobody has tested whether timing matters.

Why the urgency stands regardless. The urgency of this injury does not rest on osteonecrosis at all: tented skin necroses within hours, and an extruded talus is contaminated from the moment it appears in the wound. Reduce tonight; definitive bony fixation can be staged once the soft tissues recover.

Total talar prosthesis. Custom total talar replacement is emerging, predominantly from Japanese centres, as a salvage option for talar AVN or collapse. Cadaveric data raise concerns about anterior instability, and downsized implants dislocate. Its role after total dislocation is experimental and not established.