Sacroiliac pain can be aggravated by sitting or standing for a long time, standing on one leg, climbing stairs, going from one sitting position to another, and running. Possible causes of sacroiliac pain include arthritis, traumatic injuries, pregnancy and postpartum, systemic inflammatory conditions, and infections. Sacroiliitis is a painful condition that affects one or both sacroiliac joints. These joints are where the lower part of the spine and the pelvis meet.
Sacroiliitis can cause pain and stiffness in the buttocks or lower back, and the pain can affect one or both legs. Standing or sitting for a long time or climbing stairs can make the pain worse. You'll most likely feel pain in the sacroiliac joint in the lower back and buttocks, but it can spread to the hips and descend to the thighs, groin, and even the feet. If sacroiliac joint pain is due to inflammatory back pain, such as that caused by ankylosing spondylitis, there are other distinctive features, such as pain that lasts longer than three months, feels better with movement and worsens with rest and often wakes you up in the middle of the night.
Osteoarthritis, which occurs when the cartilage that cushions and protects the ends of bones gradually deteriorates, can affect the cartilage in the sacroiliac joint and cause pain. Radiofrequency ablation is only considered if temporary pain relief is achieved after injection into the sacroiliac joint. This procedure uses radio waves to heat a small area of nerve tissue to prevent it from sending pain signals and, therefore, reduce pain. In some cases, doctors inject steroids into the sacroiliac joints to help reduce inflammation and pain.