Perthes

When the blood supply to the femoral bone of the hip joint is disrupted, it causes death of some of the bones. This causes a vascular necrosis or Perthes. This disease generally affects the hip joint. This ball and socket type of joint where the cup or the socket lies is the acetabulum and the femoral head is the ball. The healing process breaks down the dead bone to form a new bone instead. The process of these restructures lead to deformity and collapse along with structural weakness. The loss of the blood flow in the femur head caused the bone to die partially and then totally. Although the dead bone looks structurally the same but the absorption of the dead bone gradually leads to structural weakness, deformation of the hip which ends up in the inability to rotate the hip but to flex and extend. Patients complain hip and joint pain initially and earlier diagnosis may help to some extent.