Hi Peter.
Another overuse condition is called Thoracic Outlet syndrome TOS.
It can be caused by other injuries also.
I was wondering if you had heard about it, we have a TOS forum here if you would like to read about it.
TOS forum- main-
http://neurotalk.psychcentral.com/forum24.html
useful TOS info thread-
http://neurotalk.psychcentral.com/thread84.html