Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: Which body part did Lance Harper injure? Title: Varsity Blues Movie plot: Jonathan "Mox" Moxon (James Van Der Beek) is an academically gifted backup quarterback for the West Canaan High School football team. Despite his relative popularity at school, easy friendships with other players, and smart and sassy girlfriend, Jules Harbor (Amy Smart), Mox is dissatisfied with his life. He wants to leave Texas to go to school at Brown University. He also dislikes his football-obsessed father (Thomas F. Duffy) and dreads playing football under legendary coach Bud Kilmer (Jon Voight). Kilmer is a verbally abusive control freak whose philosophy can be summed up as "win at all costs". He has a strong track record as coach, remarking in a speech that "in my thirty years of coaching football at West Caanan, I have brought two state titles, and 22 district championships!" Kilmer's philosophy finally takes its toll on Coyotes' quarterback, Lance Harbor (Paul Walker). It is revealed that Lance, who is Mox's best friend, had been manipulated into taking cortisone shots into an injured knee that finally gave out on a huge sack. Lance is rushed to the hospital, where doctors are appalled at the massive amount of scar tissue found under his knee.Mox, who has accompanied Lance to the hospital, is shocked when Kilmer tells the doctor that he knew nothing at all about Lance's knee problems, when in fact Kilmer ordered the trainer to inject the shots. In need of a new quarterback, Kilmer reluctantly names Mox to replace Lance as captain and starting quarterback. The move brings unexpected dividends for Mox, one of them being Darcy Sears (Ali Larter), Lance's beautiful blonde cheerleader girlfriend, who is interested in marrying a football player in order to escape small-town life. Darcy even goes so far as to attempt to seduce Moxon, sporting a bikini made of whipped cream over her otherwise naked body, but he rebuffs her as gently as he can.Becoming fed up with Kilmer and not feeling a strong need to win, Mox starts calling his own plays on the field without Kilmer's approval. He also finally tells his...
Knee