by Erik Dalton Ph.D.
Theory of shoulder girdle function
The shoulder girdle functions to position the hand, provides stability for hand use, lifts, pushes, elevates the body, assists with forced inspiration and expiration, and even weight bearing as in crutch-walking. The hand performs a significant range of functions. It is an organ of touch, an extension to the brain that provides information to the visual system about the environment, and it is an important organ for expression and nonverbal communication. The hand can grasp with forces exceeding 100 pounds as well as hold and manipulate a delicate thread. Unfortunately, optimal hand functioning is often jeopardized by problems occurring in the shoulder girdle, elbow and wrist.