Fig. 1From: Perioperative peri-implant fracture after osteosynthesis for geriatric femoral pertrochanteric fracture with the linear compression integrated screw intramedullary nail system (INTERTAN™): a retrospective studyRadiologic measurements of the morphology of the femur. A Neck-shaft angle. B Cavity width at the mid-lesser trochanter level. C Cavity width 20 mm below the mid-lesser trochanter level (low-lesser trochanter width). D Diameter of the isthmus. The canal flare index was B/DBack to article page