Sacroiliac Joint Anatomy

Sacroiliac joints (SI joint) are joints in the lower back region, where the sacrum and ilium bones join. Even though these joints are small and have limited motion, they have an important role in connecting your spine to the pelvic bone and the lower part of your body. They perform an important function of absorbing injurious shock forces of the upper portion of your body. 

Sacroiliac Joint Injection

Any inflammation or irritation in SI joints may cause pain in the lower back, abdomen, groin, buttocks or legs. Sacroiliac joint injections can be used both for diagnostic as well as therapeutic purposes for pain. As a diagnostic tool, it helps your doctor locate the origin of pain. For therapeutic uses, SI joint injections will contain a steroid medication along with an anaesthetic agent to provide relief from pain for a longer duration. 

Sacroiliac Joint Injection Procedure

  • You will have an intravenous catheter placed in your arm before the procedure begins. 
  • The catheter is to provide medications if necessary during the procedure. 
  • You will be lying on your stomach and the area where the needle is to be inserted near the SI joint is numbed with a local anaesthetic injection. 
  • Then your doctor will advance the needle under the fluoroscopic guidance. 
  • Once the needle is in the right position the medication is injected. 
  • To diagnose SI joint pain, an anaesthetic injection is given to the joint under X-ray guidance. 
  • An acute relief in low back pain following the injection indicates an abnormality in SI joint. 
  • When steroid medication is injected into the painful and inflamed joint, the inflammation reduces and relieves the pain.

Risks and Complications of Sacroiliac Joint Injection

Complications are very rare but do occur. The possible complications after SI joint injections include allergic reaction, infection and increased pain.

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