Why is corticosteroid used in sacroiliac joint injection?

The sacroiliac joints connect the base of the spine with the pelvis. Irritation in this area can make standing, walking, turning in bed, or climbing stairs uncomfortable. A corticosteroid is an anti-inflammatory medicine placed near the joint. Its aim is to settle inflammatory irritation rather than repair a damaged joint or correct every possible cause of back or buttock pain.

The injection may also include a local anaesthetic. A temporary change in pain after the procedure can give the clinician useful information about whether the sacroiliac joint is contributing to symptoms. Relief varies and may be brief or last longer; the response does not replace a full assessment.

Tell the treating clinician about medicines, allergies, diabetes, infection, pregnancy, and any blood-thinning treatment before the injection. Follow the instructions about eating, driving, and medication changes. Afterward, keep activity light at first and observe how your pain and movement change. A planned physiotherapy programme may help you build on improved comfort with controlled movement.

Do not judge the result only by the first few hours, because the anaesthetic and corticosteroid can act on different time frames. Record changes in pain, walking, sleep, and daily tasks so they can be discussed at follow-up.

Contact the clinic promptly if the injection site becomes increasingly red, hot, swollen, or drains fluid, or if you develop a fever or feel markedly unwell. Seek urgent help for new leg weakness, loss of bladder or bowel control, or rapidly worsening numbness. Severe or persistent pain after the procedure also warrants medical advice.

Which symptoms suggest that my sacroiliac joint is involved? What medicine will be injected, and what changes should I track afterward? When can I resume my usual activities, and what rehabilitation should follow if pain improves?