Table 1 Baseline characteristics

Age, years

45.6 (± 8.6)

Women

25 (86.2%)

BMI, kg/m²

27.1 (± 4.4)

ASA

  I

5 (17.2%)

  II

22 (75.9%)

  III

2 (6.9%)

Preoperative opioid consumption

13 (44.8%)

Medical history

  Prior spinal fusion

3 (10.3%)

  Prior MISJF (other side)

4 (13.8%)

  Other spine surgery

3 (10.3%)

Preoperative imaging abnormality

  None

13 (44.8%)

  Degenerative SIJ

7 (24.1%)

  Other

9 (30.9%)

Cause of SIJ dysfunction

  Postpartum

13 (44.8%)

  Prior spinal fusion

3 (10.3%)

  Ehlers–Danlos syndrome

4 (13.8%)

  Posttraumatic

2 (6.9%)

  Degenerative

2 (6.9%)

  Unknown

5 (17.2%)