Sacroiliac Joint Pain
The sacroiliac joint (SI joint) is the joint bridging the lowest segment of the spinal column (sacrum) to the bones of the pelvis. These joints support the upper body when we are standing. After time, the SI joint can develop arthritis and become painful, particularly when walking and climbing stairs. Pain originating in the sacroiliac joint is generally in the lower back, buttocks and thighs.
Your physician may also refer to sacroiliac joint pain by other terms like sacroiliitis, SI joint degeneration, SI joint inflammation, SI joint syndrome, SI joint disruption and SI joint strain/sprain.