Fig. 2
From: The influence of patient factors on femoral rotation after total hip arthroplasty
Measurements on pelvic and lower extremity axial computer tomography (CT). Angle a is defined as the angle between the line of the CT berths and the line connecting both anterior superior iliac spines. Angle b is defined as the angle between the line of the CT berths and the line connecting the femoral head center with the neck center. Angel c is defined as the angle between the line of the CT berths and the posterior condylar line