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Former Trojan Palmer Goes Down With Possible Torn ACL

   GLENDALE, Ariz. (CBSLA.com/AP) — Arizona Cardinals quarterback Carson Palmer left with an injured left knee early in the third quarter of Sunday's game against the St. Louis Rams.

Palmer appeared to hurt himself while planting his leg trying to avoid a sack. He was able to walk off the field, but was taken to the locker room on a cart after that.

While further tests will be necessary to discover the extend and severity of the injury, CBSSports.com reports Palmer is believed to have possibly torn his ACL — a potential career-ending injury.

Palmer missed three games earlier this season with a damaged nerve in his throwing shoulder.

On Friday, he signed a three-year contract extension worth a reported $50 million with $20.5 million guaranteed.

Arizona trailed 14-10 when Palmer left the game with 11:28 to play.

(TM and © Copyright 2014 CBS Local Media, a division of CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2012 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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