The sacroiliac joint connects the lower part of the spine (sacrum) to the pelvis. This joint can become painful due to arthritis, trauma, or from pregnancy. Pain is commonly felt in the lower back and buttock area but may also extend into the thigh. Your provider at Origins Spine and Joint Physicians may recommend one of several options for treatment of sacroiliac joint pain. These may include X-ray guided steroid injections into the joint or the nerves that supply the joint. Radiofrequency thermal ablation of the painful nerves supplying the joint may be recommended. In some cases, sacroiliac joint fusion may be recommended.