Fig. 1
From: Overgrowth of the femoral neck after hip fractures in children
Scheme for the measurement of femoral neck length [13]. Femoral neck length (NL) was defined as the distance from the cross point (B) of the shaft axis and central axis of the femoral neck (AC) to the head center (C) measured along the central axis of the femoral neck. The neck-shaft angle is defined as the angle formed by the central axis and shaft axis. More than 3 mm of lengthening was defined as an overgrowth of the femoral neck (B–C)