Legg-Calve-Perthes disease, commonly known as Perthes disease, is a hip disorder affecting children that is caused by decreased blood flow to the head of the femur. This results in osteonecrosis (also known as “avascular necrosis”) of the proximal femoral epiphysis (femoral head), with resorption, reossification, and remodeling of the bone. Especially in children under the age of 6, Perthes disease may resolve without sequelae; in older children, however, the bone may fail to remodel to a normal shape leading to disruption of the articular surface and degenerative joint disease later in life.
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