I know a guy decently well who trains pitchers (my son is a pitcher). He works with a lot of college guys and about 15 or so pro guys. He has developed a bit of a niche working with guys coming back from injury, Tommy John usually. He said one of the toughest things is the mental part of it. The elbow is healed up but there can be a mental block. Hard to really trust their elbow again and throw 100%. There is a kind of hang over that happens with these injuries. The knee has a tough job. The joint be stable is key and Im sure, even though he is cleared and good to go, Bradford can feel a bit weak or not have great stability in the joint yet.