Legg-Calve-Perthes disease is a transient avascular necrosis of the femoral head that typically affects young boys between ages 5-7. It is characterized by limping, hip or groin pain, and decreased range of motion in the hip. Diagnosis involves history, physical exam, and x-rays which can show fragmentation and collapse of the femoral head. The goal of treatment is to contain the femoral head within the hip socket using braces, casting, or surgery like femoral or pelvic osteotomies. Most patients eventually recover fully but may develop degenerative hip changes later in life requiring total hip arthroplasty.