Table 3 Correlation between the results of MRI in patients and different age groups
Parameter | ≤ 18Y (n = 390) | 19-30Y (n = 950) | > 30Y (n = 420) | χ2, P |
|---|---|---|---|---|
Disk shape | ||||
Biconcave | 105 (26.9%) | 320 (33.7%) | 153 (36.4%) | 24.450, 0.000 |
Contracture | 145 (37.2%) | 285 (30.0%) | 98 (23.3%) | |
Lengthened | 56 (14.4%) | 143 (15.1%) | 55 (13.1%) | |
Irregular | 84 (21.5%) | 202 (21.3%) | 114 (27.1%) | |
Disk position | ||||
NA | 93 (23.8%) | 246 (25.9%) | 127 (30.2%) | 24.829, 0.000 |
s-ADD | 17 (4.4%) | 95 (10.0%) | 41 (9.8%) | |
m-ADD | 260 (66.7%) | 582 (61.3%) | 245 (58.3%) | |
PDD | 20 (5.1%) | 27 (2.8%) | 7 (1.7%) | |
Joint effusion | ||||
Na | 329 (84.4%) | 806 (84.8%) | 331 (78.8%) | 19.855, 0.001 |
Slight | 58 (14.9%) | 136 (14.3%) | 74 (17.6%) | |
Massive | 3 (0.8%) | 8 (0.8%) | 15 (3.6%) | |
Condyle | ||||
Normal | 199 (51.0%) | 499 (52.5%) | 209 (49.8%) | 0.943, 0.624 |
Abnormal | 191 (49.0%) | 451 (47.5%) | 211 (50.2%) | |
Joint motion | ||||
Limited | 106 (54.4%) | 119 (29.5%) | 91 (43.3%) | 39.259, 0.000 |
NA | 53 (27.2%) | 141 (35.0%) | 55 (26.2%) | |
Excessive | 36 (18.5%) | 143 (35.5%) | 64 (30.5%) | |