Originally Posted by Chas Tennis
Does anyone know of any neutral research on the issue?
What characteristic of the strings is important?
How do the different strings compare for that characteristic?
It seems there is no good quality statistical study of this issue, which isn't surprising. The evidence is anecdotal, but doesn't seem completely wrong. Stiffer rackets and string seem more likely to irritate tendon issues. However, the fact that some people play stiff rackets and string without issue while other people with flexible rackets and gut have developed tennis elbow shows that logically poly is not the only cause of tennis elbow.
I don't know how to properly define it, but anyone who strings knows that poly string is stiff and holds a bend, unlike gut or most synthetic guts and multis.