Femoral neck cortical bone in female and male hip fracture cases: Differential contrasts in cortical width and sub-periosteal porosity in 112 cases and controls.

•Hip fracture cases had generally reduced width of femoral neck cortical bone.•Compared to controls male cases had greater cortical thinning than female cases.•Female cases also had increased posterior zones of ultra thin (0.1 mm) cortex.•Ultra thin zones predicted hip fracture independently of generalized thinning.