It occurs when the head of the thigh (Femur)bone is forced out of the socket (Acetabulum) of hip bone. Hip dislocation is a medical emergency and needs immediate treatment.
Hip dislocation also damages the ligaments, labrum, muscles, and other soft tissues that hold the bone in place. This can include the nerves (sciatic) aswell.
With hip dislocation, there are often other related injuries, such as fractures of the pelvis , thigh bone, knee.