Imaging Case of the Week 166 Answer

The pelvic x-ray shows a left ischial tuberosity avulsion fracture.

Ischial tuberosity avulsion fractureThe hamstring muscle group originates at the ischial tuberosity. The injury occurs as a result of forceful hip flexion with the knee in extension.

Ischial tuberosity avulsion injuries may require operative management; specialist opinion should be sought.