Fig. 2From: Analysis of factors that affect the precision of the radiographic lateral femoral bowing angle using a three-dimensional computed tomography-based modelling techniquePoint a: Femoral head point, the centre of a sphere fit to approximate the femoral head. Line a: transepicondylar axis. Femoral mechanical axis: The line across the midpoint of transepicondylar axis and femoral head pointBack to article page