Intra-articular methylprednisolone  injection for SI joint pain involves placing a corticosteroid directly into the sacroiliac joint to reduce inflammation and relieve pain. It is typically done under fluoroscopy or ultrasound guidance to ensure accurate placement. Many patients experience relief within days to weeks, which can help them participate more effectively in physical therapy. Although results may be temporary, injections can break the pain cycle during flare-ups or when conservative measures haven’t been enough. As with any injection, risks include bleeding, infection, and—rarely—temporary leg numbness from nearby nerve irritation.