Just two days after being carted off the field in the first quarter of the Cincinnati Bengals' wild-card defeat that ended their season, quarterback Carson Palmer underwent surgery to repair two torn ligaments in his left knee. The surgery was performed Tuesday night by Dr. Lonnie Paulos of Houston, who repaired the anterior cruciate and medial collateral ligaments, and sources close to Palmer confirmed there was no damage to the other two knee ligaments and no cartilage tears. Palmer now faces a lengthy rehabilitation. By policy, the Bengals typically do not comment on injuries requiring surgery until after the procedure is completed. The club is expected to issue a statement Wednesday on the surgery and Palmer's status. The three-year veteran was injured on the second offensive snap for Cincinnati when Pittsburgh defensive end Kimo von Oelhoffen was blocked into him. Palmer exited on a cart and an initial MRI exam at Paul Brown Stadium indicated the two ligament tears. The tears were confirmed in a subsequent examination. The fact Palmer was wearing a brace on the knee, which he donned after a 2004 injury, might have saved him from more severe damage.