Ankle Dislocation

Quick answer

An ankle dislocation is the displacement of the talus out of its normal position between the tibia and fibula. The talus sits tightly between the bones of the lower leg — so a true dislocation almost always requires a fracture of one or both malleoli, the talar dome, or both. These injuries are usually called fracture-dislocations, and they are emergencies requiring rapid reduction (putting the joint back in place).

Why this is urgent

Several things can go wrong fast when the ankle is dislocated:

• Skin necrosis — the displaced bone tents the skin from the inside; if pressure isn’t relieved, the skin dies
• Vascular compromise — blood vessels can be stretched, kinked, or torn, threatening the foot
• Nerve injury — stretched or compressed nerves can cause permanent numbness or weakness
• Compartment syndrome — uncommon but possible
• Open injury — fragments of bone may break through the skin

For all of these reasons, rapid reduction is the priority — typically within 30 minutes to a few hours of arrival at an emergency department, regardless of whether definitive surgery happens that day.

How it happens

Mechanisms include:

• High-energy trauma — motor vehicle collisions, falls from height, severe sports injuries
• Lower-energy mechanisms in older adults — even a stumble off a curb can cause a fracture-dislocation in someone with osteoporotic bone
• Severe rotational injuries — common in falls during sports involving cutting and pivoting

The direction of dislocation is usually described relative to the tibia: anterior, posterior, lateral, medial, or superior. Posterolateral is most common.

Recognition

This is rarely subtle. Signs include:

• Visibly deformed ankle
• Pale, cool, or dusky foot if circulation is compromised
• Severe pain
• Inability to move or weight-bear
• Numbness or tingling if nerves are involved
• Open wound with bone visible in some cases

If you suspect an ankle dislocation, don’t try to straighten it yourself — call emergency services. Splint the limb in the position it’s found, immobilize it, and keep the patient warm.

Initial emergency management

In the emergency department:

• Rapid assessment of skin, circulation, and nerves
• X-rays to confirm the dislocation and define the fracture pattern
• Reduction under sedation — the orthopedic team or emergency physician applies traction and counter-traction to relocate the talus
• Splint in the new position
• Re-X-ray to confirm reduction
• Re-check skin and circulation

If circulation is threatened, reduction may happen before complete imaging — the priority is restoring blood flow to the foot.

Definitive treatment

Almost all fracture-dislocations require surgery to stabilize the bones:

• Open reduction and internal fixation (ORIF) — plates and screws hold the malleoli (and any other fragments) in correct alignment
• Sometimes external fixation initially, if soft tissue swelling is severe; converted to internal fixation later
• Long recovery — typically 6–8 weeks non-weight-bearing in a cast or boot, then progressive weight bearing
• Hardware removal is occasionally needed later

In rare cases — usually pure dislocations without fracture — closed reduction and casting alone may be sufficient, but these are uncommon.

Long-term outlook

Outcomes depend heavily on:

• The energy of the injury — high-energy injuries do worse than low-energy ones
• The status of the cartilage at the time of injury
• Skin and soft tissue health
• Time to reduction — faster is better
• Quality of surgical reconstruction

Even with optimal treatment, a significant fraction of ankle fracture-dislocations develop post-traumatic arthritis over years to decades, sometimes requiring fusion or replacement later.

Bottom line

An ankle dislocation is almost always a fracture-dislocation, and it’s an orthopedic emergency. Rapid reduction protects the skin, blood supply, and nerves; surgery follows to definitively reconstruct the joint. The faster the reduction and the better the surgical reconstruction, the better the long-term function — but post-traumatic arthritis remains a real risk over time.