Posterior hip dislocation

The hip joint is a pestle and acetabular joint, consisting of an acetabulum and a femoral head. The acetabulum is deep and large and can accommodate most of the femoral head. The joint capsule and surrounding ligaments are strong, forming a fairly stable joint with a low incidence of dislocation. The anterior wall of the hip capsule has a strong patellofemoral ligament, the inner upper wall has a pubic sac ligament, and the posterior upper wall has a sciatic sac ligament. However, the inferior and posterior inferior walls lack ligaments and are relatively weak. Dislocations can easily occur from these two places. There are only two types of simple hip dislocations without acetabular fractures. Later dislocations are most common clinically.