By Will Yoder
February 15, 2012

Indianapolis Colts star quarterback Peyton Manning underwent an unreported fourth surgery last year for his neck injury, according to SI.com’s Don Banks.

The exact date of the surgery is unknown; however, it was performed anytime between his surgery on May 23 to repair a bulging disk and a surgery on Sept.9 for a cervical neck fusion, according to NFL sources.  The same doctor who performed the May 23 surgery actually did a follow-up operation last summer before the Sept.9 surgery.

League sources also told SI.com that bone spurs have developed above the site of the fusion surgery completed in September.

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