Association (n=1411 hips) between cam impingement parameters and end-stage osteoarthritis (n=39) at 5-year follow-up
| Cam impingement parameter | No end-stage osteoarthritis at follow-up | End-stage osteoarthritis at follow-up | Unadjusted OR (95% CI) | Adjusted OR* (95% CI) | |
|---|---|---|---|---|---|
| Radiographic | α Angle >60° | n=139/156 | n=17/156 | 6.82 (3.55 to 13.10) | 3.67 (1.68 to 8.01) |
| Referent group ≤60° | n=1233/1255 | n=22/1255 | |||
| α Angle >83° | n=42/56 | n=14/56 | 17.71 (8.71 to 36.02) | 9.66 (4.72 to 19.78) | |
| Referent group ≤83° | n=1330/1355 | n=25/1355 | |||
| Clinical | Hip internal rotation ≤20° | n=200/223 | n=23/223 | 9.34 (4.66 to 18.71) | 7.13 (3.38 to 15.04) |
| Referent group >20° | n=1172/1188 | n=16/1188 | |||
| Combined | α Angle >83° and hip internal rotation ≤20° | n=9/19 | n=10/19 | 53.79 (20.96 to 138.08) | 25.21 (7.89 to 80.58) |
| Referent group: hips not having both conditions | n=1363/1392 | n=29/1392 | |||
All p values for OR are <0.0001.
*Adjusted OR are corrected for Kellgren and Lawrence grade, age, body mass index and sex at baseline.