Fig. 1From: Composite indices of femoral neck strength predicts the collapse of steroid-associated osteonecrosis of the femoral head: a retrospective studyGeometry of the femoral neck: FNW: femoral neck width, HAL: hip axis length. The equations adopted included: CSI = (BMD*FNW) / weight; BSI = (BMD*FNW.2) / (HAL* weight); ISI = (BMD*FNW*HAL) / (height *weight)Back to article page