Syndesmosis Injuries to the Ankle. A syndesmosis injury occurs when the foot twists outwards relative to the leg — a so-called external rotation injury. This type of injury can occur when the ankle is forcefully twisted outwards, or when the foot is planted, and the leg twists inwards.
If the syndesmosis is damaged, the ankle joint may become unstable. A syndesmosis injury occurs when the foot twists outwards relative to the leg, a so-called external rotation injury. This type of injury can occur when the ankle is forcefully twisted outwards, or when the foot is planted, and the leg twists inwards.
The diagnosis of syndesmosis injuries is usually made by examining the ankle. The doctor moves your ankle in different positions in order to check the ligaments and tendons around the ankle. The syndesmosis is stressed by turning the ankle outward while holding the lower leg still.