The subtrochanteric fractures are relatively rare in the child and they constitute a therapeutic problem. The pseudarthrosis of this fracture in the child is often the complication of a subtrochanteric fracture treated orthopedically. We report the case of a subtrochanteric pseudarthrosis in a 5 year-old child occurred following an orthopedic treatment. After surgical treatment by bloody reduction and pinning, the pseudarthrosis consolidated in 10 months with satisfactory functional results.