Criteria used to assess the presence of femoroacetabular impingement on anteroposterior radiograph
| Type of impingement | Sign |
|---|---|
| Cam | Pistol grip deformity12 13 |
| Cam | CCD angle <125°13 |
| Cam | Femoral head neck index <15014 |
| Pincer | Coxa profunda13 |
| Pincer | Protrusio acetabuli13 |
| Pincer | Lateral centre edge angle >39°19 |
| Pincer | Acetabular index ≤013 |
| Pincer | Cross-over sign13 |