Femoro-acetabular impingement is a serious and commonly seen disorder causing early osteoarthritis in adult population. But this disease can be diagnosed in pediatric age group mainly secondary to the commonly seen pediatric hip diseases. Legg-Calvé-Perthes disease also may cause femoro-acetabular impingement by deforming the femour head. Surgical hip dislocation can be a good approach to the treatment of this problem. However, late results must be evaluated before a final decision.