Figure 29b. Intramedullary nails. (a) Frontal radiograph of the femur shows a comminuted midfemoral shaft fracture that is transfixed with an antegrade intramedullary nail with one proximal and two distal interlocking screws. (b) Frontal radiograph of the femur in a different patient shows a distal femoral shaft fracture that is transfixed with a retrograde intramedullary nail with one proximal and two distal interlocking screws.