Sacroiliitis is defined as tenderness in the sacroiliac joints which are located in the lower spine and pelvic connects. Sacroiliac joint are the connections between spine to pelvis and lower skeleton. It results in the pain in lower back or buttocks and this pain can extend down to legs, groin and feet. Sacroiliitis is associated with various diseases like ankylosing spondylitis, reactive arthritis and psoriatic arthritis.
