The sacrum is a large triangular bone at the bottom of the spine. It is inserted like a wedge between the two hipbones.

The sacrum is shorter and wider in women than in men.

Current as of: February 20, 2015

Author: Healthwise Staff

Medical Review: Anne C. Poinier, MD - Internal Medicine & C. Dale Mercer, MD, FRCSC, FACS - General Surgery