A hip dislocation occurs when the head of the thighbone (femur) slips out of its socket in the hip bone (pelvis). In approximately 90% of patients, the thighbone is pushed out of its socket in a backwards direction (posterior dislocation). This leaves the hip in a fixed position, bent and twisted in toward the middle of the body. The thighbone can also slip out of its socket in a forward direction (anterior dislocation). If this occurs, the hip will be bent only slightly, and the leg will twist out and away from the middle of the body. A hip dislocation is very painful. Patients are unable to move the leg and, if there is nerve damage, may not have any feeling in the foot or ankle area.
An extreme acute injury such as a motor vehicle accident or fall from a height
Hip reduction (placing bones back into proper position)