الفهرس 
ACKNOWLEDGMENT
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Abstract
Legg-Calvé-Perthes disease (LCPD) is a condition in which the blood supply of the capital femoral epiphysis (head) is disrupted, resulting in epiphyseal osteonecrosis and chondronecrosis with cessation of growth of the ossific nucleus. The necrotic epiphyseal bone is eventually resorbed and replaced by new bone. During the resorptive phase of the healing, the mechanical properties of the femoral head are weakened such that some femoral heads develop a flattened deformity (coxa plana). Over time, the femoral head reossifies, it resumes growth with some overgrowing (If bone re-ossification was excessive ,will result in mushroom shaped head (coxa magna)), and remodels to a variable degree of roundness until skeletal maturity.(2) The optimal treatment goal is to obtain a spherical femoral head with good congruency to prevent or delay the onset of osteoarthritis after skeletal maturity. There is agreement that patients younger than 5 years with a good remodeling capacity have a particularly excellent prognosis, irrespective of treatment.(4) The current surgical treatment options, including proximal femoral varus osteotomy, innominate osteotomy, lateral shelf acetabuloplasty, triple pelvic osteotomy, and Chiari pelvic osteotomy have proved to be effective in covering the femoral head within the acetabulum. To promote the coverage of the femoral head, shelf acetabuloplasty directly increases the size of the acetabulum by implanting graft bone to the lateral rim.