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What is the sacrum?

The sacrum is an inverted bone shaped like a triangle. It is actually a fusion of five vertebrae, located just below the lumbar spine. This is where the spine articulates with the pelvis on the posterior aspect. Below the sacrum is the tailbone, known as the coccyx.

(This answer provided for NATA by the University of Tampa Athletic Training Education Program)

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.