Takai H, Mizuta K, Murayama M, et al. - Researchers assumed that adaptive positioning technology (ADAPT) would be beneficial to orthopaedic residents and evaluated this usefulness. This study included a total of 102 patients who had undergone open reduction and internal fixation for femoral trochanteric fracture from May 2017 to March 2019 using Gamma-3 intertrochanteric nails. All procedures were conducted by two residents; 51 patients underwent surgery applying ADAPT and the others had undergone surgery without navigation. They analyzed number of attempts to drill guide-wire, operation time, lag screw insertion time, radiation exposure time, TAD, and lag screw position for each surgeon. One resident exhibited better outcomes with the ADAPT system than with conventional osteosynthesis. Nevertheless, another resident received no advantage from ADAPT. The efficiency may not use to everyone as individual competence can affect efficiency when applying ADAPT system. Thus, as a new device, it must be applied cautiously because skill or experience may influence its use, particularly by orthopaedic residents.