What kind of way is that to hold something up? High Lunge, Crescent Variation If you want to place down a tea tray or a napkin, you would use the High Lunge, Crescent Variationhorizontal surface of a tabletop long before attempting to put it on High Lunge, Crescent Variation the table's vertical leg! The large, three-dimensional sacroiliac joint may be that way High Lunge, Crescent Variation because humanoids used to walk on all fours rendering the joint horizontal, and the structure hasn't evolved to reflect our upright posture.
Or perhaps this orientation and shape really are most effective for the joint's delicate balancing act between the supportive role below and the flexibility demanded by the actions of the structures above it. In any event, the joint has adapted by developing very powerful ligaments that crisscross from the sacrum to the iliac bones and back again, and stalagmites and stalactites that interdigitate and hold the parts together.
If the heart is the center of the circulatory system, the sacrum is the heart of the musculoskeletal system. It bears the brunt of all our weight and is the vertex of all movement where balance in space is a factor.
This goes for climbing stairs, swimming, sexual activity, and taking a book from a library shelf.
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Is it so strange that many older people have trouble moving because of pain in this region? The same powerful forces that hold the functioning joint together are formidable adversaries when it comes to correcting a joint that is out of kilter. Considerable leverage must be generated to overcome the ligaments that then hold the joints tightly in the wrong alignment.