The bottom line is the knee is a very, very inherently unstable joint which was never made to play football.

You've damaged the nerves and arteries around the joint. They can't function normally when the knee is filled with fluid.

The spot is the key to the operation. Misplacing this femoral tunnel only three or four millimeters can have a devastating result.

You're looking at two little poke holes and a small incision to harvest the graft.

The ACL has little, if any, ability to heal itself, and if it's torn it now leaves you with a functional disability. You can't run, jump or cut.

You have to re-educate that leg as to its muscle-firing patterns, the nerve pathways, so you can walk and run again.