![]() ![]() The femoral head in this stage looks like it is in pieces. It is during this phase that the bone is in a weaker state and the head of the femur is more likely to collapse into a flatter position. Over a period of 1 to 2 years, the body removes the dead bone beneath the articular cartilage and quickly replaces it with an initial, softer bone. This initial stage may last for several months. The area becomes intensely inflamed and irritated, and your child may begin to show signs of the disease, such as a limp or different way of walking. In this stage of the disease, the blood supply to the femoral head is disrupted and bone cells die. There are four stages in Perthes disease: In the first stage of Perthes disease, the bone in the head of the femur slowly dies. After 18 to 24 months of treatment, most children return to daily activities without major limitations. The long-term prognosis for children with Perthes is good in most cases. This will help the hip joint move normally and prevent hip problems in adulthood. Treatment for Perthes focuses on helping the bone grow back into a more rounded shape that still fits into the cup-shaped acetabulum (the socket of the hip joint). Over time, the blood supply to the head of the femur returns and the bone begins to grow back. As the condition progresses, the weakened bone of the head of the femur (the ball of the ball-and-socket joint of the hip) gradually begins to collapse. Without an adequate blood supply, the bone cells die, a process called avascular necrosis.Īlthough the term "disease" is still used, Perthes is really a complex process of stages that can last several years. It occurs when the blood supply to the rounded head of the femur (thighbone) is temporarily disrupted. ![]() Perthes disease is a rare childhood condition that affects the hip.
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