Table 3.
Baseline frequencies of semi-quantitative MRI biomarkers – osteophytes
| MRI feature | Biomarker | Overall n (%) | Controls | Cases | p-value |
|---|---|---|---|---|---|
| Osteophytes | Number of locations affected by any osteophyte | ||||
| 0 | 19 (3 %) | 15 (3.7 %) | 4 (2.1 %) | ||
| 1 | 34 (6 %) | 30 (7.4 %) | 4 (2.1 %) | ||
| 2 | 42 (7 %) | 36 (8.9 %) | 6 (3.1 %) | ||
| 3 | 58 (10 %) | 43 (10.6 %) | 15 (7.7 %) | ||
| 4 | 54 (9 %) | 39 (9.6 %) | 15 (7.7 %) | ||
| 5 | 47 (8 %) | 38 (9.4 %) | 9 (4.6 %) | ||
| 6 | 45 (8 %) | 28 (6.9 %) | 17 (8.8 %) | ||
| 7 | 37 (6 %) | 23 (5.7 %) | 14 (7.2 %) | ||
| 8 | 49 (8 %) | 26 (6.4 %) | 23 (11.9 %) | ||
| 9 | 41 (7 %) | 26 (6.4 %) | 15 (7.7 %) | ||
| 10 | 47 (8 %) | 30 (7.4 %) | 17 (8.8 %) | ||
| 11 | 48 (8 %) | 33 (8.1 %) | 15 (7.7 %) | ||
| 12 | 79 (13 %) | 39 (9.6 %) | 40 (20.6 %) | ||
| Number of locations affected by any osteophyte category | <0.001* | ||||
| 0–2 | 95 (16 %) | 81 (20.0 %) | 14 (7.2 %) | ||
| 3–5 | 159 (27 %) | 120 (29.6 %) | 39 (20.1 %) | ||
| 6+ | 346 (58 %) | 205 (50.5 %) | 141 (72.7 %) | ||
| Max osteophyte score in knee | |||||
| 0 | 19 (3 %) | 15 (3.7 %) | 4 (2.1 %) | ||
| 1 | 290 (48 %) | 209 (51.5 %) | 81 (41.8 %) | ||
| 2 | 202 (34 %) | 132 (32.5 %) | 70 (36.1 %) | ||
| 3 | 89 (15 %) | 50 (12.3 %) | 39 (20.1 %) | ||
| Max osteophyte score in knee category | 0.011* | ||||
| 0–1 | 309 (52 %) | 224 (55.2 %) | 85 (43.8 %) | ||
| 2 | 202 (34 %) | 132 (32.5 %) | 70 (36.1 %) | ||
| 3 | 89 (15 %) | 50 (12.3 %) | 39 (20.1 %) |
*statistically significant at p < 0.05; p values refer to differences between cases and controls across all grades