Why are you giving me Shoulder Blade exercises if I have Shoulder pain–Part 2
More about how the shoulder blade works with the shoulder and how bad shoulder girdle strength can cause shoulder impingement. The image and movie clip below show shoulder blade elevation, with the actress in the video showing LESS elevation and upward rotation on the left than the right.
The space between the ball (humeral head) and the shelf above (acromium) which sits on the shoulder blade is where impingement of one or two of the rotator cuff tendons happens (supraspinatus or infrapinatus).
Here is an image of a normal shoulder and one with impingement:
If the shoulder blade is hanging low (like the one on the left in the video) the space for the tendon is a lot smaller. So doing shoulder blade strengthening exercises to elevate the shoulder blades will help with shoulder blade pain itself.