Table 6.
The prevalence of the incidental findings demonstrated on MRI of the SI joints in the different institutions (N = number of patients).
| Total N | Total % | BEL N | BEL % | CAN N | CAN % | POL N | POL % | |
|---|---|---|---|---|---|---|---|---|
| Degenerative disc of the lower lumbar spine | 87 | 16,1 | 12 | 6,7 | 40 | 22,2 | 35 | 19,4 |
| Hip fluid (no evidence of synovial proliferation) | 24 | 4,4 | 8 | 4,4 | 16 | 8,9 | 0 | 0 |
| Lumbosacral transitional variant, no BME | 22 | 4,1 | 11 | 6,1 | 8 | 4,4 | 3 | 1,7 |
| Schmorl nodules | 17 | 3,1 | 2 | 1,1 | 1 | 0,6 | 14 | 7,8 |
| Arthritis hip (evidence of synovial proliferation) | 17 | 3,1 | 12 | 6,7 | 4 | 2,2 | 1 | 0,6 |
| Simple (bone) cyst | 15 | 2,8 | 7 | 3,9 | 1 | 0,6 | 7 | 3,9 |
| Edema pedicle/ spondylolyse with BME | 12 | 2,2 | 2 | 1,1 | 10 | 5,6 | 0 | 0 |
| BME, non-specific (CRMO excluded) | 10 | 1,9 | 3 | 1,7 | 4 | 2,2 | 3 | 1,7 |
| Enthesitis/tendinitis gluteus muscle | 8 | 1,5 | 8 | 4,4 | 0 | 0 | 0 | 0 |
| Enthesitis other (not SIJ/not gluteus muscle) | 8 | 1,5 | 6 | 3,3 | 2 | 1,1 | 0 | 0 |
| Facet joint arthrosis/arthritis | 7 | 1,3 | 1 | 0,6 | 5 | 2,8 | 1 | 0,6 |
| Spina bifida occulta | 7 | 1,3 | 2 | 1,1 | 3 | 1,7 | 2 | 1,1 |
| Ovarian cyst | 7 | 1,3 | 0 | 0 | 4 | 2,2 | 3 | 1,7 |
| Lumbosacral transitional variant, with BME | 6 | 1,1 | 2 | 1,1 | 4 | 2,2 | 0 | 0 |
| Muscle pathology/ edema | 4 | 0,7 | 1 | 0,6 | 3 | 1,7 | 0 | 0 |
| CRMO | 4 | 0,7 | 3 | 1,7 | 0 | 0 | 1 | 0,6 |
| Other | 4 | 0,7 | 0 | 0 | 4 | 2,2 | 0 | 0 |
| Benign tumor | 3 | 0,6 | 1 | 0,6 | 2 | 1,1 | 0 | 0 |
| Fracture | 3 | 0,6 | 0 | 0 | 3 | 1,7 | 0 | 0 |
| Bony apophyseal avulsion | 2 | 0,4 | 2 | 1,1 | 0 | 0 | 0 | 0 |
| Malignant tumor | 2 | 0,4 | 1 | 0,6 | 0 | 0 | 1 | 0,6 |
| Degenerative hip | 1 | 0,2 | 0 | 0 | 1 | 0,6 | 0 | 0 |
| AVN hip | 1 | 0,2 | 0 | 0 | 1 | 0,6 | 0 | 0 |
| Total pathology | 271 | 84 | 116 | 71 | ||||
| Total patients with incidental findings | 228 | 42 | 72 | 40 | 96 | 53 | 60 | 33 |