man, brother, aj.listen.
if something hurts and doesnt feel right, dont do that exercise, a leson i have learned the hard way.
as for deca, it helps the bones, get ssome water in joints(but so does test), overall why not try a little bit, wont hurt.
possible deca dick kkep in mind.
for tendons and joints, if you want-can afford it, some gh will be best.
thats 1 postivie attribute of gh, it helps the joints quick and good.