Winny joint pain is a myth ... it increased collagen synthesis dramatically in ligaments and tendons. It was the orginal purpose of the drug for race horses.
The pain is real, its its due growth of the actual connective tissue much like that of GH and IGF1. Winny is also an anti-E and it will suck up your water supply making you dryer and maybe a tad more brittle but dont worry.
ill dig up the study ... like I said, if anything winstrol is benefical.