Low energy hip dislocation is rare and usually associated with hip abnormalities. We present a case of an old woman who stumbled at home. Plain radiographs and a CT scan showed a posterior hip dislocation. Closed reduction was done and the patient was discharged after two days. Last follow-up radiographs showed a stable hip with no evidence of avascular necrosis of the femoral head. In our case no hip abnormalites were detected. Probably there was capsular laxity because of aging, but we could not find any obvious reason responsible for this dislocation.