The Sacroiliac Joint | Sacral Nutation and Counter-nutation

The video tutorial explains the concepts of nutation and counter nutation of the sacrum, focusing on their roles in the stability and mobility of the sacroiliac (SI) joint. Nutation involves the anterior rotation of the sacrum's superior surface and posterior rotation of the inferior surface, while counter nutation is the reverse. The sacrotuberous ligament restricts nutation, and the long dorsal sacroiliac ligament restricts counter nutation. The video emphasizes the SI joint's low mobility, which is crucial for preventing dislocations and ensuring proper load transfer.

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