November 28, 2018

The Shoulder: Labrum vs. Rotator Cuff

Here at Yoga Athletex we put an emphasis on injury prevention and joint stabilization exercises. Today we are going to take a look at our shoulder. We will gain a better understanding of the difference between a labrum tear and a rotator cuff tear.

Your labrum is a cup shaped rim of cartilage that lines and reinforces your ball and socket joint on your shoulder. Your ball and socket joint is composed of the gleniod, a shallow shoulder socket, and the humerus, which is the ball of your upper arm. Your labrum is a tough fibrous structure that deepens your glenoid socket, this helps hold you humerus in place when you rotate your shoulder. Your labrum also serves as an attachment point for you at your glenoid-fosse. So; when your labrum tears, your ball shaped humeral head has the possibility of sliding out of socket.

Your rotator cuff consists of four groups of muscles and tendons . This group of muscles and tendons stabilize your shoulder joint and allow you to rotate and move your arm. The four muscles and tendons follow. There is the Supraspinatus, this keeps your upper arm stable, while holding your humerus in place. There is the Infranspinatus helps externally rotate your shoulder joint. Third is your Teres Minor, this also helps externally rotate your shoulder joint and works with other rotator cuff muscles to stabilize the head of your humerus in the Glenohumeral joint . Lastly is your Subscapularis. This muscle depresses the head of your Humerus to allow free movement when elevating your arm. All of these muscles work together to centralize the humerus bone, while doing different movements and stabilize your shoulder. So when you tear your rotator cuff you are tearing one or more of these muscles.

If you have experienced one of these injuries in the past and would like to prevent it from happening in the future book an FMS screen today! Not sure what FMS is? Learn more here.

-Bradley R., YAX Intern + Elite Soccer Athlete


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