The oblique sacroiliac (SI) joint view — obtained with the patient rotated about 25–30° (posterior oblique) — is the best plain X‑ray projection to profile and “open” the SI joint, showing joint space, sclerosis, erosions, and ankylosis. An AP pelvis is routinely obtained, but CT or MRI is preferred when radiographs are inconclusive or detailed assessment is required.

An X-ray of the sacroiliac (SI) joints shows joint space width, bone sclerosis, erosions, bony bridges or ankylosis, osteophytes, calcifications, and fractures. It helps detect sacroiliitis, degenerative changes, inflammatory arthritis (e.g., ankylosing spondylitis) and structural damage. Early inflammatory changes may be missed on X-ray; advanced changes like joint fusion are well visualized.

An SI‑joint X‑ray typically costs: in the US about $100–500 for self‑pay (higher at hospital radiology departments), in the UK it’s free on the NHS or roughly £50–150 privately, and in India roughly ₹200–1,500. Final price depends on location, facility, number of views, radiologist fees and insurance coverage; additional imaging (CT/MRI) raises costs.

Left SI joint pain is pain originating from the left sacroiliac joint that links your lower spine to the pelvis. Causes include arthritis, sacroiliitis, trauma, pregnancy, leg-length differences, or mechanical stress. Symptoms are lower-back/buttock pain that can radiate to the groin or thigh, stiffness, and pain with standing or single-leg activities. Diagnosis uses exam and imaging; treatment includes rest, NSAIDs, physical therapy, SI belts, and injections.

SI joint pain typically causes low back, buttock, or groin pain that worsens with standing, walking, stair climbing, or prolonged sitting. Exam shows focal tenderness over the sacroiliac joint and positive provocation tests (FABER, Gaenslen, compression, distraction). Pain may radiate into the thigh but usually not past the knee. A diagnostic SI joint injection can confirm the diagnosis.

For initial hip pain evaluation, get an anteroposterior (AP) pelvis radiograph plus dedicated hip views—AP of the affected hip and a lateral view (frog‑leg or cross‑table lateral if trauma). These views detect fractures, arthritis, or dislocation. If X‑rays are normal but concern persists (occult fracture, soft‑tissue injury, or avascular necrosis), advanced imaging such as MRI or CT is recommended.