The Shoulder

The elegant, complex piece of machinery known as the shoulder makes all arm movements possible. The ability to lift a cup of coffee, to swing a golf club or to pick flowers from the garden comes from the mobility and flexibility of the shoulder. The strength and mobility of the shoulder allows a baseball player to throw a pitch at over 100 miles per hour.

The shoulder is capable of a wide range of motion and is the most flexible joint in the body. This tremendous flexibility comes at a price, as it results in the shoulder being the most unstable joint in the body. This instability is a result of the ball of the upper arm being larger than the socket of the shoulder. To remain stable, the shoulder must be anchored by its muscles, tendons, and ligaments. These structures are subject to injury, overuse, and under-use.

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