What the video shows
It shows the relationship between the upper arm, the shoulder blade and the space in the upper shoulder during movement. This helps explain why symptoms are often felt at the front or side of the shoulder when the arm is raised.
Video
Pain when lifting the arm
The video illustrates how the upper arm moves in relation to the shoulder blade and the upper part of the shoulder during arm elevation. With impingement, this movement can irritate sensitive tissues, but the visual alone does not diagnose the source of pain.
How this may feel
Some people notice pain through part of the movement, weakness or discomfort after repeated overhead work. Assessment of movement and load helps identify the relevant factors.
A sensible next step
When arm elevation repeatedly brings on pain or limitation, a functional assessment can help determine which loads and exercises make sense at this stage.