In this WWE.com exclusive, doctors look at John Cena following his match with Brock Lesnar at Extreme Rules 2012.

CHICAGO – John Cena's victory over Brock Lesnar came with a steep price, as the Cenation leader suffered an injured left arm in his Extreme Rules Match against the wrecking machine at Extreme Rules in Chicago. ( PHOTOS)

Lesnar made it a point to punish Cena's arm in their hotly anticipated bout at Chicago's sold-out Allstate Arena, trapping his arm in a Kimura Lock halfway through their show-stopping clash. And while Cena – who also took an elbow in the opening moments of the match that split his head open – beat Lesnar by a narrow margin with an Attitude Adjustment on the steel steps, it appears he has ended up the worse for wear despite the victory.

"The most obvious injury was the laceration to his head, which caused a substantial amount of bleeding," WWE locker room physician Dr. Chris Amann told WWE.com following the Extreme Rules Match on Sunday night. "He also suffered a shoulder injury."

Following an MRI and a battery of tests on his left arm Monday, doctors confirmed that Cena has sustained multiple muscle strains but suffered no permanent structural damage.

UPDATE: INJURY EXACERBATED ON RAW

Cena’s already injured arm was the focal point of a 3-on-1 attack lead by Raw and SmackDown GM John Laurinaitis on Monday’s Raw SuperShow. Together with Lord Tensai and Sakamoto, the GM brutally assaulted Cena. While Tensai held Cena's injured arm across the ring steps, Laurinaitis stomped on it and slammed a steel chair on the exposed limb. Finally, the GM mocked Cena with his signature "You can't see me" gesture. ( WATCH |  PHOTOS | FULL STORY)

During the attack, Laurinaitis announced he would square off with Cena in a match at Over the Limit. ( PREVIEW)