Knee alert: The danger signs for the average golfer

It seems Woods' left knee gave out because of the "tremendous forces" he exerts during his swing, according to leading U.S. orthopedic specialist Dr. Nicholas A. DiNubile MD.

He tore his Anterior Cruciate Ligament (ACL) in 2008 and further problems flared up this year to sideline him from the U.S. and British Opens.

DiNubile believes the former world number one can get back to his best, but warned: "The knee is never quite the same when your tear the ACL."