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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Ann Biomed Eng. 2013 Feb 15;41(6):1162–1171. doi: 10.1007/s10439-013-0762-1

Figure 1.

Figure 1

Alpha angle and head-neck offset measured on DRRs of the standing frog-leg lateral view. Left - A circle was fit to the femoral head and a line was drawn across the narrow section of the femoral neck. Alpha angle (α) was measured between a line from the center of the femoral neck to the center of the head and a second line from the center of the head to the point where the femur deviated from the best-fit circle. Right - Head-neck offset was measured by drawing line 1 along the axis of the femoral neck, line 2 parallel to line 1 tangent to the anterolateral neck and line 3 parallel to line 1 tangent to the anterolateral femoral head. Offset was measured as distance (d) between lines 2 and 3.