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. 2020 Oct 28;56(1):31–45. doi: 10.4085/1062-6050-0488.19

Figure 3.

Figure 3

The α angle. This measure is used to locate the point of loss of concavity at the femoral head-neck junction. A line is drawn along the femoral neck axis through the center of the femoral head to form 1 ray of the α angle. A circle of best fit is then placed over the femoral head, and the point at which the femoral head-neck junction exits the circle is noted. A line is drawn from the center of the femoral head to this exit point to designate the other ray of the α angle.2,18,23,24