Radiopaedia.org

There is apophyseal avulsion from the right ischial tuberosity. A large semilunar fragment of cartilage measuring 4cm in size has been detached from the body of the ischial tuberosity. The apophyseal fragment is distracted by 1.4cm and there is a fluid field cavity within the spaces. The hamstring origin remains attached to the apophysis. Blood fluid products track around the obturator internus, obturator externus and quadratus femoris muscles and encase the sciatic nerve.