It’s purpose is protection - not movement.
[Shoulder pain and rehab]
We have had a lot of shoulder complaints in the practice of late so I wanted to share some vital information for those with shoulder injuries or those looking to prevent them.
The rotator cuff (RC) is made up of four muscles that attach from the back, too and front of the shoulder blade (scapula) onto the arm (humerus)
They are the supraspinatus, infraspinatus, teres minor and subscapularus. If you look them up on wiki then you will probably be told that they rotate or lift the arm, which is true but it is not their most important function .
Their more important function is controlling the position of the humerus in the shoulder socket. The big deltoid muscle that sits on top of these muscles is a much more important mover of the arm but it does not really help with protecting the shoulder like the RC
The RC muscles actively hold the humerus against the middle of the shoulder joint so that it doesn’t move too much in the joint and grind or compress other tissues around it - this is called centration of the shoulder .
But what happens with either weakness, tears or poor activation of the RC muscles is just that! If the deltoid and other muscles become too dominant and pull the humerus away from the middle of the joint, injuries result! Impingement syndrome affecting the top and front of the shoulder is a perfect example of this when the deltoid pulls the arm up more than the RC can resist it
Key take away: regular mobility and strength work will help 95% of people avoid these shoulder issues so we will have a great video ready for you tomorrow
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