Coxa magna is a result of insult to the femoral head or epiphysis in childhood. Coxa magna deformity is a late radiographic finding in this patient with Legg-Calve-Perthes. Patients with Legg-Calve-Perthes is at risk for developing early osteoarthritis (OA) and femoral acetabular impingement (FAI).
Differential Diagnosis :