Femoroacetabular Impingement

 

Measurement Range for Measurements
Sharp angle 33°-38°, normal
<32°, insignificant
39°-42°, borderline
>42°, dysplastic
Tönnis angle −10° to 10°, normal
>10°, acetabular dysplasia
<10°, pincer lesion
Lateral center edge angle of Wiberg 22°-42°, normal
<20°, dysplastic
≥20° and ≤25°, borderline dysplastic
≥40°, overcovered
Arthritis <2-mm joint space indicative of arthritis best managed nonarthroscopically
Alpha angle <55°, normal
>55°, cam femoroacetabular impingement