Tano A, Oh Y, Fukushima K, et al. - Via conducting a multicentre prospective study using CT-based finite element analysis, researchers sought to describe the locational characteristics associated with atypical femoral fractures (AFFs) in an Asian, specifically Japanese, population regarding bone strength. From their multicentre research project, this work represents the second report proposing a possible new concept of diagnostic criteria or treatment according to AFF subtype.They examined femoral neck bone density and strength among the following three study groups composed of elderly females over the age of 60 years—the mid-shaft AFF group (n = 14; 80.0 ± 6.5 years), the subtrochanteric AFF group (n = 15; 73.9 ± 6.8 years), and the control group who had sustained unilateral hip fracture (n = 21; 82.1 ± 7.1 years). The subtrochanteric AFF group vs the mid-shaft AFF and control groups had significantly higher femoral neck bone density and strength. At the very least, because of bone fragility, high risk of hip fracture was evident for Japanese patients with mid-shaft AFF relative to those with subtrochanteric AFF who have firm bone. They recommend cervical screw insertion toward the femoral head for internal fixation of mid-shaft AFF using an IM nail to prevent a possible hip fracture.