 It is also performed in cases of trauma where the head of the femur is badly broken or severed, or in response to other diseases of the hip bone, such as Legg-Calve-Perthes' disease.It is sometimes the procedure of last resort when other methods have failed or sepsis of the joint has occurred, but it can be indicated when the hip joint is severely affected or if arthritis In the joint is serious enough.It can also be indicated in small animals with pelvic fractures, particularly fractures of the acetabulum (socket of the pelvis).