Never done winny but had a few buddy that did. It's common knowledge that it can have a negative effect on the joints/tendons. I have heard to many people over the years complain of winny use and subsequent injury.
Deca, EQ, Anavar, and Primo all have been shown to increase collagen synthesis and lend to stronger tendons/ligaments. I have personally used Deca while recovering from an injury to the connective tissue in my right bicep and give it a thumbs up !
As for me, I won't risk the possibility of an injury caused in part by what winny does to joints/tendons/ligaments. Pain is the bodies way of saying STOP !