Your sacrum is the triangle-shaped bone at the bottom of your spine, and your iliac is made up of two fan-shaped bones. They join together at your SI joint to form your pelvic girdle or hips.
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Verywell Health on MSNLumbosacral Joint (L5-S1): Anatomy and Pain SymptomsThe sacrum and the coccyx each consist of multiple bones that fuse over time. L5-S1 consists of the last bone in the lumbar ...
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