Fig. 2.

a Preoperative A-P radiograph for 37-year old man. The right femur shows a type IV subtrochanteric fracture. b Immediate postoperative radiograph shows a longitudinal gap exceeding 2 mm between the proximal and the distal fragment. c Radiograph 2-weeks postoperatively. Because application of the DHS was closest to the hip joint reaction force and the plate was not fixed to the proximal fragment, the dynamization of the DHS is not blocked. Therefore, the gap reduced, the fracture stabilized and callus formation started medially. d Radiograph 1-year postoperatively shows healed fracture and no implant failure