re: Who has had a hip replacement before 40?

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Like Bo Jackson, most people who need a hip replacement in their 20's is do to a condition known as Avascular Necrosis....

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In a “normal” hip, the head (ball) of the femur (thigh bone) is covered adequately and well seated in the acetabulum (hip socket). The hip socket is “cup shaped.” In contrast, a dysplastic hip has incomplete or inadequate coverage of the femoral head. The dysplastic hip is more “dish shaped.”

Because of the inadequate coverage of the femoral head in a dysplastic hip, the weight across the hip is distributed on a smaller surface area resulting in excessive load along the rim of the hip socket. Over time, this increased load along the rim of the socket will lead to degeneration of joint cartilage and formation of osteoarthritis.

Patients with this condition frequently seek medical attention due to activity-related hip pain (discomfort in the groin or side of the hip).

Prolonged sitting or walking can also increase these symptoms and a sensation of catching or popping may also occur. As these symptoms continue to increase, a slight limp may be noticed and more strenuous activities may become difficult.

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