Sacroiliac joint pain involves the joints between the spine and the pelvis. The sacrum consists of the five fused vertebrae that are at the base of the spine and between the iliac bones, which are the two largest bones of the pelvis. According to MedlinePlus, the major reasons for pain in this joint include muscle tightness, pregnancy, arthritis, differences in leg length, worn cartilage and trauma.
MedlinePlus recommends that individuals suffering from sacroiliac joint pain rest their injury and apply ice for 20 minutes at a time to the lower back or buttock, two to three times daily, to reduce swelling and pain. Heat helps to reduce tight muscles that are sometimes responsible for the pain. The pain often responds to massaging the muscles around the joint. Over-the-counter pain relievers, such as ibuprofen, acetaminophen and naproxen, help relieve the pain.
When conservative care measures and physical therapy do not bring relief, a physician may order a steroid injection. The injection helps to reduce the patient's dependence on pain medication. Reducing the pain with an injection sometimes eliminates the need for surgery, according to the UC San Diego Health System. The injection requires the patient to check into an outpatient surgery center. If the therapy helps the pain temporarily, the patient's doctor often recommends repeating the injection.