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Femoroacetabular Impingement: Can the Alpha Angle Be Estimated?

Mohamed R. Nouh1,2, Mark E. Schweitzer1, Leon Rybak1 and Jodi Cohen1

1 Department of Radiology, Hospital for Joint Disease, New York University, New York, NY.
2 Present address: Department of Radiodiagnosis and Diagnostic Imaging, Faculty of Medicine, Alexandria University, 1 Kolya-El Teb St., Mahata El-Ramel, Alexandria, Egypt.


Figure 1
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  		Fig. 1 —41-year-old man with femoroacetabular impingement. Perfect circle is centered over acetabular segment of femoral head. Neck axis is made parallel to anterior femoral neck cortex in line with head center ({alpha}–b line). Alpha angle is drawn from transition of head into neck where neck radius exceeds head radius ({alpha}–c line).

 

Figure 2
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  		Fig. 2 —Axial oblique fat-saturated T2-weighted image in 35-year-old woman with femoroacetabular impingement. Alpha angle is estimated to be 60.5° with a confidence score of 4, probably abnormal, by first reader and a score of 2, probably normal, by second reader.

 

Figure 3
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  		Fig. 3 —Graph shows sensitivity and specificity of subjective evaluation by both readers. Central dotted line indicates average for both readers.

 

Figure 4
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  		Fig. 4 —Scatterplot of replicate assessments of alpha angle provided by single reader for each of 20 subjects.

 

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