Intraarticular Corticosteroid Therapy in Perthes Disease.

Inclusion Criteria: * age of 4 to 12 years * diagnosed with Idiopathic osteonecrosis of the femoral head * symptoms less than 12 months old. Exclusion Criteria: * Symptoms for more than 12 months * Previous treatment other than anti-inflammatories, crutches or bed rest * Subjects more than 8 years old or have a hand bone age greater than 6 years old and lateral pillar B or B/C disease. * Bilateral hip disease * Personal or family history of problems with general anesthesia * Prior steroid treatment * Previous diagnosis of: * Asthma * Identifiable rheumatologic condition * Metabolic Diseases (including but not limited to Gaucher's disease or congenital hypothyroidism) * Sickle cell disease * Known pain syndrome * Hip sepsis * Prior malignancy (solid organ or bone marrow transplant) * Blood Clotting disorder