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Old 01-02-2013, 09:24 AM   #703
Chas Tennis
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Join Date: Feb 2011
Location: Baltimore, MD
Posts: 4,126

From another thread -

"Best to view the Ellenbecker video as I could misinterpret. At minute 8 he describes the shoulder orientation to minimize the risk of impingement.

Think of the line between the two shoulders and the line of the upper arm. If those lines fell in a straight line, the angle is 180, and the shoulder internally rotates (upper arm axial rotation) well and impingement risk is low. As the upper arm rises relative to the shoulders the risk increases. I have read that 170 is still OK. Let's say that it is higher than recommended, at 150 for example - then there is more risk of impingement.

You can also visualize the angle by extending the shoulder-shoulder line and considering the complementary angle. Then for example, 0 is upper arm straight out, 10 is the upper arm up slightly and still OK, 30 is the upper arm up and at increased risk of impingement.

I see many players serving well beyond the 10.

The shoulder orientation requires lateral trunk flexion which may stress the back for some people."
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