What is it?

The sacroiliac (SI) joints connect the spine to the pelvis. Pain from these joints can be vague. Injections are used to help confirm the SI joint as the source of pain and to provide pain relief with steroid medication.

Preparation

• Bring prior relevant CT or MRI scans if done elsewhere.
• Inform us if you take blood thinners; some must be stopped 5–7 days before.
• Arrange someone to drive you home.

Risks

This is a safe and commonly performed procedure. Temporary increase in pain, headache, flushing, or rash may occur. Steroids may affect blood sugar levels in diabetics. Rare risks include infection (<0.1%), bleeding, or nerve irritation.

Procedure

The procedure takes approximately 15 minutes and is performed under CT guidance while lying on your stomach. Local anaesthetic is used before a fine needle is placed into the joint and steroid with anaesthetic is injected. Steroid effects may take up to 2 weeks.

Aftercare

Mild soreness is common. Temporary pain relief may occur from the anaesthetic. You will be monitored briefly before discharge. Do not drive for the rest of the day. Rest for 48 hours, then gradually return to normal activity.

Effectiveness

Approximately 75% of patients experience pain relief. Duration of relief varies from days to months. Repeat injections may be required at least one month apart. No more than three injections per joint are recommended per year.