Sacroiliac joint imaging

The sacroiliac (SI) Joint has several unique anatomical features that make it one of the more challenging joints to image. The joint is difficult to profile wen on radiographic views, and therefore the radiographic findings of sacroillitis are often equivocal. Computed tomography images can usually show the findings of sacrolliltis and osteoarthritis earlier than radiographs. Magnetic resonance imaging performed with proper sequences is excellent for diagnosing even very early sacroillitis and for following treatment response. The SI joint is often involved in patients with osteoarthritis or one of the inflammatory spondyloarthritides, most notably ankylosing spondylitis. Ankylosing spondylitis often presents with sacroillitis, which appears as erosions, sclerosis, and joint space narrowing, eventually leading to ankylosis. Several disorders can cause sacroilitis-like changes of the joint, including hyperparathyroidism and repetitive shear-stress injuries in athletes. The Joint can become painful during pregnancy as it widens and develops increased motion, and some postpartum. 9 women develop iliac sclerosis adjacent to the joint termed osteltis condensans ilii. Another cause of SI joint pain is a disorder called sacroiliac joint dysfunction, which typically has few abnormal imaging findings. Patients with SI joint dysfunction, as wen as sacroiliitis, often get relief from image-guided SI joint therapeutic injections.