Predictive validity of the three definitions for total hip replacement (THR) at follow up (n = 3561)
| Total incident THR at follow up* | THR/ROA† | OR (95% CI) | |
|---|---|---|---|
| *Number of incident THR at follow up predicted by each definition/number ROA cases at baseline, as defined by each definition of hip ROA. | |||
| †Number of cases of THR predicted by each definition/number of ROA cases defined by each definition. | |||
| CI, confidence interval; OR, odds ratio; ROA, radiological osteoarthritis. | |||
| Kellgren and Lawrence (⩾grade 2) | |||
| Right | 57 | 33/154 (21.4) | 30.6 (17.5 to 53.5) |
| Left | 42 | 22/110 (20.0) | 34.3 (18.1 to 65.2) |
| MJS (⩽2.5 mm) | |||
| Right | 57 | 26/151 (17.2) | 18.6 (10.7 to 32.3) |
| Left | 42 | 19/123 (15.4) | 22.6 (11.8 to 43.0) |
| Croft grade (⩾grade 3) | |||
| Right | 57 | 46/673 (6.8) | 16.0 (8.0 to 31.8) |
| Left | 42 | 28/717 (3.9) | 6.7 (3.4 to 12.9) |