question: I injured my shoulder last year sometime. It could have been an accumulation of events. I run outside during the winter & have fallen on pavement a few times on my right shoulder. I feel a dull pain when I sleep on my right shoulder. That comes an goes. I also feel a muscle tenderness on the back side of my arm. I tried to shoot a layup today & I had to stop because it felt like my shoulder popped out of place. could this be a rotator cuff injury or is it another type? When it happened last fall I reduced my running and did some excerises but not enough