What is Post Perthes deformity?
Perthes disease is a rare childhood condition that affects the hip when blood supply to the hip bone is disrupted. The hip is a ball and socket joint that is made up of the femoral head (ball) and acetabulum (cup/socket). The epiphysis at the upper end of the femur is the growth center that eventually becomes the femoral head. A lack of blood supply affects this growth centre and causes weakening or death of the bone tissue. This can change the shape of the hip and causes pain in the process.
When blood supply to the hip is restored, the bone can reform. During this time it is important to keep the head of the femur inside the hip socket, to encourage the bone to form in a round, normal shape. It is common however to see deformity persist after the healing. This may present as an irregular shape or angle to the femoral neck and head.