Elsevier

Clinical Biomechanics

Volume 4, Issue 4, November 1989, Pages 204-209
Clinical Biomechanics

Original article
Load application to the sacrotuberous ligament; influences on sacroiliac joint mechanics

https://doi.org/10.1016/0268-0033(89)90003-XGet rights and content

Abstract

In the embalmed human pelvis, the connections between sacrum and fifth lumbar vertebra were spared together with most of the ligaments. The effect of load application to the sacrotuberous ligament was studied on rotation in the sacroiliac joint. It was shown that load application along the direction of hamstring and gluteus maximus muscles significantly diminished ventral rotation of the sacrum. The results imply that loading the sacrotuberous ligament restricts nutation of the sacrum. Consequently, muscles which attach to the sacrotuberous ligaments, such as the gluteus maximus, and in certain individuals the long head of the biceps, can dynamically influence movement and stability of the sacroiliac joints. The importance of sacrotuberous ligaments and sacroiliac joints as parts of the kinematic chain is emphasized.

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