The sacroiliac (SI) joint exists between the sacrum and ilium bones in the back of the pelvis. Sacroiliac joint dysfunction is a degenerative condition of this joint that can result in lower back pain. It is frequently overlooked and can explain up to 15-30% of cases of low back pain in the outpatient setting. Risk factors include previous lumbar fusions as well as prior trauma to the pelvis.
The SI joint has complex degrees of motion and degenerative changes over time can lead to inflammation and pain very similar to other spinal pathology. This frequently leads to low back pain as well as occasionally radiating leg pain. The mainstay of treatment consists of non-operative management but in the event symptoms fail to improve, minimally invasive surgical options exist after proper workup.