Clinical Information:

A recreational tennis player sprained her left ankle during exercise 3 weeks ago, resulting in lateral ankle pain. Physical examination showed local tenderness over the anterior talofibular ligament and the sinus tarsi region. Range of motion of ankle was full.

Brief Description:

Ultrasound showed hypoechoic and thickening of the anterior talofibular ligament. There is also a calcific lesion over the talar end of the ligament. Sonographically it may represent an avulsion fracture of talus with partial tear of anterior talofibular ligament.