The Sacroiliac (SI) joint is part of the pelvis and is located where the ilium join the sacrum. The SI joint is the connection between the spine and the pelvis and acts as a shock absorber and is prone to dysfunction, simply by its design. It can become inflamed, causing great pain or discomfort. The coccyx is the tailbone and will become inflamed in the same way as the SI joint, causing coccygeal pain.
Read this article for more information on evaluation and treatment.
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