Unusual cause of central dislocation of the hip.

A 23-year-old teacher of physical training was admitted to another hospital on 28 February 1971 with a history of sudden onset of pain in the right hip during a game of netball played on a concrete surface. She stated that she had jumped about 3 ft (91 cm) into the air and landed on her right heel with the knee locked in extension and t-he hip flexed at about 100. She was unable to walk after the injury and an x-ray film taken on admission showed a fractured acetabulum (Fig.) She was treated with skin traction in a Thomas splint. There was no history of previous fractures,