Deca is a good steriod and is considered a staple in a basic mass building steroid cycle. I think you will like it, run it with test. There is only one way for you to find out how your body will react to it. Go for it.
I don't think Deca is going to help you accomplish your goals in any way. you can strengthen your knee without steriods. The Deca will most likely increase your weight. Also if you don't have pct lined up, you will lose your gains.