Superior Articular Process of Sacrum Anatomy in 3D

The "Top knobs" of the tailbone. These articulate with the L5 vertebra; "Spondylolisthesis" is a condition where the L5 vertebra "Slides off" these processes, causing severe back and leg pain.

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Related structures

Sacrum Superior Articular Process of Vertebra Ala of Sacrum Apex of Sacrum Auricular Surface of Sacrum Base of Sacrum Dorsal Surface of Sacrum Lateral part of sacrum