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Sacroiliac joint pain (SIJP) after lumbar fusion surgery has recently gained attention as a source of low back pain after lumbar fusion. There are two risk factors for postoperative SIJP, i.e., fusion involving the sacrum and multiple-segment fusion. In this study, we examined whether SIJP could occur more frequently in patients with two risk factors (multiple-segment fusion to sacrum). Further, we examined SIJP after multiple-segment (≥3) lumbar fusion, focusing on the difference between floating fusion (non-fused sacrum) and fixed fusion (fused sacrum).

Sacroiliac joint pain after multiple-segment lumbar fusion: a long-term observational study-Non-fused sacrum vs. fused sacrum