Can he be relied on week after week for the next few years as the No. 1 guy? That will be the challenge.

The knee was not designed to be hit with all that force at all those angles, ... It has very strong ligaments, but when that sudden force is applied to those ligaments, especially with a lot of torque, things tear.

The first time around, I was pretty optimistic that he'd come back. With two back-to-back rotator cuff tears, you just wonder how good the quality of the healing will be in that area.

Your body is more vulnerable as you age. So things you did before, you might not be able to withstand now.

It may actually interfere with normal muscle functioning. That data hasn't been real strong, but there is some suggestion there may be a little negative to wearing a brace as well.

I would say a brace should be a secondary consideration.

That doesn't mean the right design someday wouldn't work.

[Improving your balance: Wobble boards and other forms of balance training should be a part of every football player's regimen.] You're often off-balance in a game, ... If you can correct for that and make adjustments quickly if you're hit, you might be lessening the risk or severity of an injury.

[Strengthening the entire body:] Not just two weeks before the season starts, and not just the legs, ... We now know that training the core [abdominal and trunk muscles] helps the knee because it stabilizes the torso and better distributes the stresses across your body.