Patient demographics.
| Demographic | N = 13 |
| Sacroiliac fusions, n | 18 |
| Bilateral | 5 |
| Age, y, mean (SD) | 55.8 (35–78) |
| Body mass index, mean (SD) | 27.9 (21.7–36.7) |
| Sex, n (%) | |
| Men | 5 (38%) |
| Women | 8 (62%) |
| Prior spine surgery, n/N (%) | 7/13 (54%) |
| Lumbar fusion, n/N (%) | 6/7 (86%) |
| Lumbar decompression, n/N (%) | 1/7 (14%) |