Table 2.
Prevalence of MRI features (standard definition*) stratified by sex, pain status, and BMI. Figures are numbers (percentage) of participants
| MRI features | Overall (n=710) | Sex | Knee pain | BMI | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Women (n=393) | Men (n=317) | P value | Pain (n=206) | No pain (n=489) | P value | <25.0 (n=222) | 25-29.9 (n=278) | ≥30 (n=204) | P value | ||||
| Any abnormality | 631 (89) | 346 (88) | 285 (90) | 0.43 | 188 (91) | 430 (88) | 0.20 | 193 (87) | 249 (90) | 184 (90) | 0.51 | ||
| Osteophytes | 524 (74) | 281 (72) | 243 (77) | 0.12 | 158 (77) | 353 (72) | 0.22 | 154 (69) | 208 (75) | 157 (77) | 0.18 | ||
| Cartilage damage | 492 (69) | 273 (70) | 219 (69) | 0.91 | 149 (72) | 333 (68) | 0.27 | 153 (69) | 195 (70) | 139 (68) | 0.89 | ||
| Bone marrow lesions | 371 (52) | 213 (54) | 158 (50) | 0.25 | 121 (59) | 242 (50) | 0.03 | 117 (53) | 149 (54) | 103 (51) | 0.79 | ||
| Synovitis | 259 (37) | 139 (35) | 120 (38) | 0.49 | 78 (38) | 175 (36) | 0.60 | 88 (40) | 99 (36) | 69 (34) | 0.43 | ||
| Attrition | 228 (32) | 124 (32) | 104 (33) | 0.72 | 78 (38) | 147 (30) | 0.04 | 84 (38) | 79 (28) | 63 (31) | 0.07 | ||
| Subchondral cysts | 179 (25) | 108 (28) | 71 (22) | 0.12 | 63 (31) | 114 (23) | 0.04 | 59 (27) | 69 (25) | 50 (25) | 0.86 | ||
| Meniscal lesions | 167 (24) | 57 (15) | 110 (35) | <0.001 | 42 (20) | 120 (25) | 0.24 | 56 (25) | 72 (26) | 38 (19) | 0.14 | ||
| Ligamentous lesions | 66 (9) | 31 (8) | 35 (11) | 0.15 | 22 (11) | 43 (9) | 0.44 | 17 (8) | 25 (9) | 23 (11) | 0.43 | ||
*Cartilage lesions and osteophytes=grade ≥2; all other lesions=grade ≥1; “any abnormality”=presence of any type of abnormality as defined above. All MRI detected lesions graded with whole organ magnetic resonance imaging score (WORMS).