The shoulder is the most mobile joint in the human body, creating the need for increased stability. You can picture it as a golf ball on a tee where there is not much overlap between the two surfaces that make up the joint. The main structures that are responsible for dynamic stability of the shoulder are the rotator cuff muscles. The four muscles that make up the rotator cuffs are the:
These muscles when functioning optimally provide dynamic stability to the shoulder, which is especially important for overhead athletes such as throwers, crossfit athletes, baseball players, tennis players, etc. Without this stability, there is often pain and an increased risk for injury. You can perform the following self-test to see if you have shoulder instability. If this causes pain or discomfort, you would most likely benefit from rotator cuff muscle retraining.