Subtrochanteric fracture of the femur has been infrequently reported after pin removal that is second operation for slipped capital femoral epiphysis and that fracture is a serious complication. We report a case of subtrochanteric fracture of the femur occured after pin removal that had been inserted for fixation of slipped capital femoral epiphysis. Its treatment was open reduction with condylar blade plate and screws. We recommend insertion of fewer pins and longer pins at higher level, early pin removal, avoidance of repeated insertion and use of cannulated pin screw instead of Knowles pin for prevention of subtrochanteric fracture after pin removal.