Surgical Anatomy of the Sacrum

Abstract

The sacrum is a triangular bony structure which is fused together with five sacral vertebrae. The sacrum articulates with the ilium, the fifth vertebra, and the coccyx, forming the posterior wall of the bony pelvis. It was oblique to the spine, with the anterior surface being concave, which increases pelvic capacity to contain the pelvic organ. The lateral surfaces of the sacrum form the joint surfaces, which are articulated with the posterior inner parts of the ileum. It has a base, three surfaces, and an apex.