What Is SI Joint Pain?
SI joint pain occurs in the sacroiliac joint, a shock-absorbing structure located between the lower spine and the hip bone. The joint connects the base of the spine to the pelvis, working alongside the lumbar spine to support the upper body. Acting as a natural shock absorber, the SI joint helps reduce stress between the upper body and lower extremities.
When dysfunction or inflammation affects the sacroiliac joint, it can lead to significant pain in the lower back, buttocks, or even the affected side of the leg. Known as sacroiliac joint dysfunction, this condition can result from traumatic injuries, repetitive stress, pregnancy, autoimmune diseases like ankylosing spondylitis, or chronic pain conditions.