Ankle impingement

Posterior ankle impingement happens when soft tissue or bone at the back of the ankle becomes compressed or irritated, often causing deep pain during activities that involve pointing the toes downward. It commonly affects dancers, runners and soccer players, and can feel similar to a sprain or tendon injury. With an accurate diagnosis and the right treatment plan, most people can relieve their symptoms and get back to the activities they love.

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Anatomy of the ankle

The back of the ankle is made up of the shin bone (tibia), ankle bone (talus) and heel bone (calcaneus), along with the surrounding soft tissue. About 7 to 15% of people also have a small extra bone in this area called the os trigonum.

When you point your toes downward, these structures naturally compress. This motion is normal, but bone spurs, scar tissue or inflammation can pinch the tissue between the bones, leading to pain during activity.

Overview

Symptoms

Symptoms of posterior ankle impingement often worsen with activity and may include:

Deep pain at the back of the ankle during toe-pointing movements
Swelling or tenderness behind the ankle
Stiffness or limited upward ankle motion
Aching after sports or prolonged standing
A catching or blocking sensation in the ankle
Pain that eases with rest but returns with use

Without treatment, these symptoms can continue to interfere with sports and daily activities.

Causes

Posterior ankle impingement usually develops when repeated stress pinches the tissue at the back of the ankle. Common causes and contributing factors include:

Activities that involve pointing the toes downward, such as ballet, soccer or gymnastics
Having a small extra bone (os trigonum) or a larger bone at the back of the ankle
Previous ankle sprains or surgeries that left scar tissue
Tight calf muscles or limited ankle flexibility
Natural differences in ankle shape that make the area more likely to get pinched

Risk factors

Certain factors can raise your risk of developing posterior ankle impingement, though having one or more of these does not mean you'll develop the condition. Risk factors include participation in sports or activities that repeatedly point the toes downward, a history of ankle injury or surgery and natural variations in ankle bone structure. Your foot and ankle specialist can help you understand how your personal risk factors relate to your symptoms.

Diagnosis

Your foot and ankle specialist will ask about your symptoms and daily activities, then examine your ankle, checking for pain when you point your toes downward. To confirm the diagnosis and rule out fractures or tendon injuries, your care team may recommend weight-bearing X-rays to evaluate your bone anatomy, an MRI to assess soft tissue inflammation or an ultrasound for real-time evaluation during movement.

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