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Legg-Calve-Perthes Disease Legg-Calve-Perthes Disease Legg-Calve-Perthes Disease (a.k.a. Osteonecrosis) is a rare, temporary condition only found in children ages 4 to 12, with the average of 6 years old. In an infected child, the femoral head loses its blood supply; bone begins to die and over time may develop a fracture. The bone then begins to.