K&L grading among all hips and stratified by pain statusa
| Characteristic | Total (N= 1982) | Painful hips (n = 789) | Pain-free hips ( n= 1193) |
|---|---|---|---|
| K&L grade, n (%) | |||
| 0 | 1282 (64.7) | 464 (58.8) | 818 (68.6) |
| 1 | 482 (24.3) | 220 (27.9) | 262 (22.0) |
| 2 | 205 (10.3) | 95 (12.0) | 110 (9.2) |
| 3 | 13 (0.7) | 10 (1.3) | 3 (0.3) |
| 4 | 0 (0.0) | 0 (0.0) | 0 (0.0) |
| Early-stage ROA, n (%, 95% CI) | 700 (35.3, 33.2 to 37.4) | 325 (41.2, 37.8 to 44.6) | 375 (31.4, 28.8 to 34.0) |
| Definite ROA, n (%, 95% CI) | 218 (11.0, 9.6 to 12.4) | 105 (13.3, 10.9 to 15.7) | 113 (9.5, 7.8 to 11.2) |
↵a Early-stage ROA is defined as K&L grade ≥1 and definite ROA is defined as K&L grade ≥2. K&L = Kellgren and Lawrence. ROA = radiographic osteoarthritis.