@anatomy.of.motion: Your arm has a great coupling mechanism which can help us understand how compensatory injuries are created. Place your hand on the wall and introduce rotation in the shoulder. From the shoulder's perspective, this should cause the whole arm to rotate. But the hand firmly placed on the wall is not rotating, so where did the movement go? It got balanced with the opposite rotation of your forearm. When the shoulder rotates externally, the forearm pronates by the same amount to keep the hand relatively steady. Similarly, when the shoulder rotates internally, the forearm supinates. When one part of this coupling wants to work outside of the other's balancing capabilities, compensatory injury can be created. #anatomy #biomechanics

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Wednesday 09 April 2025 13:19:59 GMT