Xray of both sacroiliac joints lateral view, in Visit Clinic

The best plain radiographic view to visualize the sacroiliac (SI) joint is the AP oblique projection (about 25–30° rotation), which profiles the joint space. For definitive assessment, cross‑sectional imaging is superior: CT best for bony detail and fractures, MRI best for sacroiliitis and soft‑tissue/inflammatory changes. Fluoroscopic oblique views guide SI joint injections.

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Magnetic resonance imaging (MRI) is the best test for sacroiliac joints, especially for early inflammatory changes (bone‑marrow edema, synovitis) using STIR or fat‑suppressed T2 sequences (and T1 with contrast if needed). Plain X‑rays and CT are more useful for detecting chronic structural damage (erosions, sclerosis, joint space loss), while bone scans are less specific.

To check the sacroiliac (SI) joints: note pain over the posterior iliac crest or buttock. Perform provocative tests—FABER (Patrick’s), Gaenslen’s, and pelvic compression/distraction—positive if they reproduce the usual pain. Palpate the PSIS and sacral sulcus for tenderness and asymmetry. Use straight-leg-raise to exclude nerve-root pain. If tests suggest SI dysfunction or red flags, obtain imaging (X‑ray/MRI) and refer to a clinician.

Yes. Gentle, low‑impact walking can help sacroiliac (SI) joint pain by improving mobility, circulation, and the strength of supporting core and hip muscles. Keep walks short, on even ground with supportive shoes; avoid uneven terrain or prolonged standing during flares. Consider a pelvic belt or walking aid, and combine walking with prescribed stretches and strengthening. See a clinician if pain worsens or you develop numbness.

Inflammation of the sacroiliac joints can result from inflammatory arthritis (especially ankylosing spondylitis and related spondyloarthropathies), infection (septic sacroiliitis), mechanical stress or trauma, degenerative changes (osteoarthritis), pregnancy-related ligament laxity, and conditions linked to autoimmune or inflammatory bowel disease. Less commonly, metabolic or crystal arthropathies contribute. Symptoms and treatment depend on the underlying cause.