SI stands for various terms. Discover the full forms, meanings, and possible interpretations of SI across different fields and industries.
Sacroiliitis is a medical condition caused by any inflammation within one, or both, of the sacroiliac joints. Sacroiliitis is a feature of spondyloarthropathies, such as ankylosing spondylitis, psoriatic arthritis, reactive arthritis or arthritis related to inflammatory bowel diseases, including ulcerative colitis or Crohn's disease. It is also the most common presentation of arthritis from brucellosis.
MedicalA natural arch or natural bridge is a natural rock formation where a rock arch forms, with an opening underneath.
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