(A) The megaprosthesis of the distal femur was located directly under the skin without any muscle tissue. (B) The proximal portion of the sartorius muscle was fully detached and then the sartorius muscle was dissected at the myotendinous transition in the region near the origin. The intermuscular septum between the sartorius and quadriceps muscles was incised. (C) A hole through which to pass the sartorius muscle flap was created, and the sartorius muscle flap was guided to the lateral thigh to prevent it from twisting between the quadriceps muscle and the femur.