Alpha angle
Femoroacetabular impingement
Magnetic resonance imaging
Measured on axial MRI of the hip. An angle superior to 55° is highly suggestive of femoroacetabular impingement.
NöTzli HP, Wyss TF, Stoecklin CH et-al. The contour of the femoral head-neck junction as a predictor for the risk of anterior impingement. J Bone Joint Surg Br. 2002;84 (4): 556-60.
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