Table 7.
Results of the MRI evaluation for test subjects of the control group (group N, n = 30 subjects) and the group of patients with rheumatoid arthritis (group RA, n = 30 patients). (DD = disk displacement.)
| MRI findings | Group N | Group RA | ||
|---|---|---|---|---|
| left | right | left | right | |
| Sample size (n individuals/n TMJs) | 30 | 30 | 30 | 30 |
|
| ||||
| Condyle/fossa relationship (closed mouth) | ||||
| Centered | 90% | 87% | 60% | 47% |
| Anterior oriented | 3% | 0% | 7% | 17% |
| Posterior oriented | 7% | 13% | 33% | 37% |
| Cranial oriented | 3% | 3% | 23% | 20% |
| Caudal oriented | 17% | 13% | 43% | 47% |
| Disk position parasagittal (closed mouth) | ||||
| Regular | 83% | 67% | 27% | 33% |
| Partial anterior DD with reduction | 10% | 30% | 37% | 33% |
| Partial anterior DD without reduction | 0% | 0% | 3% | 0% |
| Complete anterior DD with reduction | 3% | 0% | 0% | 0% |
| Complete anterior DD without reduction | 3% | 0% | 20% | 17% |
| No evaluation possible | 0% | 3% | 13% | 17% |
| Signal intensity PD/T2 (condyle) | ||||
| Increased signal intensity | 0% | 0% | 23% | 13% |
| Signal intensity PD/T2 (bilaminar zone/joint space) | ||||
| Increased signal intensity | 7% | 3% | 90% | 80% |