Aslan L, Subasi O, Demirhan M, et al. - This study was undertaken to investigate the success of proximal cephalomedullary nailing operations for treating trochanteric fractures, surgeons utilize 2D fluoroscopy to observe the relative positions of the femoral head and the implant. This study assessed the safety and accuracy of orthogonal fluoroscopic imaging. The data exhibited that depending solely on the orthogonal fluoroscopic images is not a safe and accurate technique for assessing joint penetration risk during proximal femoral fixation due to the spherical geometry of the femoral head. The results considered that the screw tip can lie completely outside of the femoral head even when it seems inside, in both orthogonal fluoroscopic views. Evidently, more stringent distance limits should be chosen, contrary to the recommended 5 mm limit when using Tip-Surface Distance (TSD). For TSD combinations, the safety maps may be applied to check the security of the implantation.