Early Results of Sacro–Iliac Joint Fixation Following Long Fusion to the Sacrum in Adult Spine Deformity

Background The sacro–iliac joint (SIJ) is the largest joint in the human body. When the lumbar spine is fused to the sacrum, motion across the SIJ is increased, leading to increased degeneration of the SIJ. Degeneration can become symptomatic in up to 75% of the cases when a long lumbar fusion ends with a sacral fixation. If medical treatments fail, patients can undergo surgical fixation of the SIJ.