The shoulder is inherently the most unstable joint in the body, well at least for the major joints. This is because you sacrifice stability for mobility. In other words, we have to do a lot of things with our shoulders like reach overhead and behind the back, feed ourselves, dress, groom, etc. If something is very stable, it doesn’t move much. The anatomy of the shoulder is such that it lends to much greater mobility, and much less stability.

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