Table 4 Baseline frequencies of semi-quantitative MRI biomarkers – meniscus
MRI feature | Biomarker | Overall n (%) | Controls | Cases | p-value |
|---|---|---|---|---|---|
Meniscus | Meniscal Morphology: baseline maximum grade in all meniscal subregions | 0.345 | |||
0 (normal or signal only, grades 0 and 1) | 253 (42 %) | 178 (43.8 %) | 75 (38.7 %) | ||
1 (any tear, grades 2–5) | 179 (30 %) | 114 (28.1 %) | 65 (33.5 %) | ||
2 (any maceration, grades 6–8) | 168 (28 %) | 114 (28.1 %) | 54 (27.8 %) | ||
Meniscal extrusion: medial | 0.005* | ||||
Grade 0: < 2 mm | 202 (34 %) | 151 (37.4 %) | 51 (26.3 %) | ||
Grade 1: 2–2.9 mm | 176 (29 %) | 119 (29.5 %) | 57 (29.4 %) | ||
Grade 2: 3–4.9 mm | 164 (27 %) | 106 (26.2 %) | 58 (29.9 %) | ||
Grade 3: > 5 mm | 56 (9 %) | 28 (6.9 %) | 28 (14.4 %) | ||
Meniscal Extrusion: lateral | |||||
Grade 0: < 2 mm | 577 (96 %) | 387 (95.3 %) | 190 (97.9 %) | ||
Grade 1: 2–2.9 mm | 7 (1 %) | 5 (1.2 %) | 2 (1.0 %) | ||
Grade 2: 3–4.9 mm | 15 (3 %) | 13 (3.2 %) | 2 (1.0 %) | ||
Grade 3: > 5 mm | 1 (0 %) | 1 (0.2 %) | 0 (0.0 %) |