No, not really. I think his arm will be fine since he hardly throws any breaking balls, and he kept the ball down last year. He strikes me as a good pitcher - not the kind of guy who falls apart when he loses a tick or two off his fastball. Well it should. A decrease in velocity and the decreasing length of a pitchers stride are two of the biggest keys to a shoulder injury. throwing less hard makes a pitcher hurt his shoulder? interesting. no. It's a symptom of shoulder injury. Maddux used to throw in the 90's. Haven't seen him come close in quite some time, yet I've never heard a thing about him having a shoulder injury. People lose velocity when they get older.