A dislocated ankle is an injury where the main bone of the foot (the talus) is forced out of its normal position between the two lower leg bones (the tibia and fibula). It’s a serious, high-energy injury that almost always involves torn ligaments and, in the vast majority of cases, broken bones as well. Pure ankle dislocations without any fracture account for only about 0.065% of all ankle injuries, making them extremely rare. Most of the time, what people experience is a fracture-dislocation, where the bones break and shift out of alignment simultaneously.
How the Ankle Joint Normally Works
The true ankle joint is formed where three bones meet: the tibia (shinbone), the fibula (the thinner bone on the outside of your lower leg), and the talus (the bone that sits on top of your heel bone). The tibia and fibula form a bracket-shaped socket called the ankle mortise, and the talus fits snugly inside it. This arrangement lets you point your foot up and down while keeping the joint stable side to side.
Three groups of ligaments hold everything together. On the inner side, the deltoid ligament resists the ankle from rolling outward. On the outer side, a set of three ligaments (the lateral collateral group) resists the ankle from rolling inward. And between the tibia and fibula themselves, a set of tough connective tissue called the syndesmosis keeps those two bones from spreading apart. For the talus to actually dislocate, at least one of these ligament groups has to tear, and usually more than one does.
What Causes an Ankle Dislocation
Ankle dislocations result from forces strong enough to overcome all of the joint’s built-in stability. Common scenarios include car accidents, falls from a height, and severe sports injuries. The direction the foot is forced determines the type of dislocation.
The most common pattern is a posteromedial dislocation, where the talus is driven backward and toward the inner side of the leg. This happens when the foot is pointed downward, loaded with body weight, and twisted inward all at once. The force tears the outer ligaments and pushes the talus out through the front of the joint. A less common pattern, superior dislocation, occurs when the foot is forced upward and outward, tearing the syndesmosis and driving the talus upward between the tibia and fibula. This type typically causes a severe fracture of the tibial surface (called a pilon fracture).
In fracture-dislocations, the deforming force first breaks the bony bumps on either side of your ankle (the malleoli) and then continues through the soft tissue to push the talus completely out of the mortise. Because so much force is involved, these injuries frequently break through the skin, creating an open wound.
What It Looks and Feels Like
An ankle dislocation is not subtle. The foot visibly sits at an abnormal angle to the leg, and the joint looks deformed. You may see bony prominences pushing against the skin (called skin tenting) or, in open dislocations, bone poking through. Swelling begins almost immediately, and the pain is severe enough that putting any weight on the foot is impossible.
Beyond the obvious deformity, there’s a risk of damage to the blood vessels and nerves that run across the ankle. If the foot feels cold, looks pale or blue, or you notice numbness or tingling in the toes, the dislocated bones may be compressing the blood supply or the nerves on the outer side of the leg. This is one reason ankle dislocations are treated as emergencies: the longer the joint stays out of place, the higher the risk of lasting damage to these structures.
How It’s Diagnosed
The deformity alone makes the diagnosis fairly obvious in an emergency setting, but X-rays are the standard first step to confirm the direction of the dislocation and identify any fractures. The Ottawa Ankle Rules, a widely used screening tool, guide whether imaging is needed. If you can’t bear weight, can’t walk four steps, or have tenderness over specific bony landmarks around the ankle, X-rays are indicated. CT scans are sometimes used afterward to map fracture patterns in detail, and MRI may follow later to assess ligament damage.
Emergency Treatment: Reduction
The immediate priority is getting the talus back into the mortise, a process called closed reduction. This is done as quickly as possible, sometimes even before imaging if the blood supply to the foot appears compromised. After pain control and sedation, a provider applies traction to the foot and manually guides the talus back into position. The technique varies by dislocation direction. For an anterior dislocation, the foot is pulled forward and then pushed back into place. For a lateral dislocation, the foot is pulled down away from the leg and shifted inward.
A successful reduction often produces an audible or palpable “clunk,” and the normal contour of the ankle visibly returns. Pain typically decreases noticeably once the bones are realigned. The ankle is then splinted to hold it in position while further treatment is planned.
When Surgery Is Needed
Most fracture-dislocations require surgery. The goal is to restore the alignment of the broken bones and hold them in place with metal plates and screws so the joint can heal in its correct shape. Surgery is more likely when the bone fragments are significantly displaced, the fracture broke the bone into multiple pieces, the ankle remains unstable after reduction, or the injury broke through the skin.
Pure ligamentous dislocations without fracture may not always need surgery, but they do require careful assessment. If the ligaments heal without sufficient stability, the joint can remain loose and prone to re-injury.
Recovery Timeline
Recovery from an ankle dislocation is measured in months, not weeks. If the injury is managed without surgery, the ankle is typically immobilized in a cast or splint for 4 to 8 weeks. With surgery, immobilization length is similar but may be followed by a walking boot. Most people are told to keep all weight off the injured ankle for at least 6 to 10 weeks.
After the initial healing phase, rehabilitation focuses on rebuilding calf strength and restoring range of motion. You’ll need full strength and flexibility in the ankle before returning to sports or physically demanding work. The total timeline to full activity varies widely depending on whether fractures were involved and how extensive the ligament damage was, but 3 to 6 months is a reasonable general range. Some people with more complex injuries take longer.
Long-Term Risks
The most significant long-term consequence of an ankle fracture-dislocation is post-traumatic arthritis. An 18-year follow-up study found that 61% of patients who had a fracture-dislocation developed advanced arthritis in the ankle joint over time. That’s significantly higher than for simpler ankle fractures. When additional risk factors are present, such as obesity or more complex fracture patterns, the incidence climbs to 60 to 70%.
Post-traumatic arthritis develops because the injury damages the smooth cartilage lining of the joint. Even when the bones heal in good alignment, the cartilage may not fully recover, leading to progressive stiffness, pain, and swelling over the years. Maintaining a healthy weight and staying consistent with rehabilitation exercises are the most practical ways to reduce this risk, though they can’t eliminate it entirely. Some people with severe arthritis eventually need an ankle fusion or joint replacement years after the original injury.