You will be shown a question, followed by excerpts from biomedical research papers. Please answer the question based on the provided context. Do not include any text in your response other than the answer.

Question: What is Legg-Calvé-Perthes Disease

Context: Legg-Calvé-Perthes' (Perthes') disease is a developmental disease of the hip joint that may result in numerous short and long term problems. The etiology of the disease remains largely unknown, but the me
Legg-Calve-Perthes disease (LCPD) is the insidious onset of idiopathic avascular necrosis of the hip in the pediatric population. The disease encompasses a wide spectrum of pathology, from mild with no long-term sequelae to severe with permanent degenerative change of the hip joint.
BACKGROUND: Legg-Perthes disease is associated with ischemia of the capital femoral epiphysis in children.
Legg-Calvé-Perthes disease is a pediatric disorder characterized by osteonecrosis of the proximal femoral epiphysis
Legg-Calvé-Perthes disease is characterized by avascular necrosis of the head of the femur.
Legg-Calvé-Perthes disease is a childhood hip disorder that may result in a deformed and poorly functioning hip.
Legg-Calve-Perthes disease is  idiopathic avascular necrosis of the hip, usually occurring in pediatric populations. Legg-Calvé-Perthes' (Perthes') disease is a developmental disease of the hip joint that may result in numerous short and long term problems. Legg-Calve-Perthes disease (LCPD) is the insidious onset of idiopathic avascular necrosis of the hip in the pediatric population.