Abstract. Purpose: Alpha and beta angles are commonly used radiographic measures to assess the sphericity of the proximal femur and distance between the pathologic head-neck junction and the acetabular rim, respectively.

Understanding Hip Dysplasia The one that is used the most to help guide treatment is the alpha angle. This angle is considered normal if it is more than 60 degrees. Mild dysplasia is present when the alpha angle is between 43-60 degrees. Dysplasia is severe when the alpha angle is less than 43 degrees.

The alpha angle is the measured angle between the line connecting the point of no sphericity of the femoral head from the center of the femoral head and the other line extending up to the center of the femoral head from the center of the femoral neck at the narrowest point.

Note the standard way of labeling triangles: angleÎ± (alpha) is opposite sidea; angleÎ² (beta) is opposite sideb; and angleÎ³ (gamma) is opposite sidec.

The alpha angle is above the 60 degrees and the beta-angle is way below 55 degrees. This is also a normal hip. There is good coverage of the femoral head.

Note the standard way of labeling triangles: angleÎ± (alpha) is opposite sidea; angleÎ² (beta) is opposite sideb; and angleÎ³ (gamma) is opposite sidec.

Note the standard way of labeling triangles: angleÎ± (alpha) is opposite sidea; angleÎ² (beta) is opposite sideb; and angleÎ³ (gamma) is opposite sidec.

To measure the alpha angle, a line is drawn between the center of the femoral head and the center of the femoral neck at its narrowest point. A circular template is placed over the femoral head. The point where the neck protrudes out from the circular template is marked.

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