Sacroiliac Joint Injection What is a sacroiliac joint injection? A sacroiliac joint injection is a diagnostic and possibly therapeutic procedure to determine if your pain is being caused by the sacroiliac joint. The sacroiliac joint is a large joint between the sacrum and ilium in the low back and buttock region. The injection consists of a mixture of local anesthetic and corticosteroid medication into the sacroiliac joint. What are the goals of a sacroiliac joint injection? The goals of a sacroiliac joint injection are: To diagnose the cause of pain To reduce and possibly eliminate pain To increase function To determine the possibility of treatment with frequency ablation (rhizotomy) How will a sacroiliac joint injection help my condition? The sacroiliac joint injection consists of a mixture of a local anesthetic and corticosteroid medications. The local anesthetic helps to diagnose if the pain is coming from the sacroiliac joint. The corticosteroid medication reduces inflammation and swelling that can cause pain and limit function. What happens during a sacroiliac joint injection? You will remain awake for the entire procedure. Once in the procedure suite: You will be positioned lying face down. The area for the injection will be washed with an antiseptic solution. A local anesthetic may be used to numb the injection site. You will be asked to remain as still as possible. You may feel pressure while the medication is injected. How long is the procedure? The procedure lasts about 10 minutes. What happens after the procedure? You will be monitored for approximately 15 minutes, because the medication takes some time to act. A nurse will review discharge and follow-up instructions with you. You will need to carefully monitor the degree and duration of your pain relief. The day after your procedure, you may resume your normal daily activities.