This seems so obvious that you'd think training staffs would understand it. you need to reduce the work load during rehab on the good appendage, and up it on the one being rehabbed, so they can become more balanced in strength, then start working them together.
But, the constant push to get them back on the field doesn't take time to make that evaluation.
Every time I hear the comment that the player's health is more important than him being on the field, I have to laugh. The NFL is the only professional sport where they'll send a guy onto the field with injuries that should stop him from playing. I keep thinking about Don Beebe and his hand injuries, and he kept playing, knowing his fingers would be unable to totally function right the rest of his life. He should never have played that way.