In addition to coming back ACL surgery, Adrian Peterson was also playing through a sports hernia last season. The Vikings running back underwent successful surgery to repair the injury in his abdominal core muscle, according to the team's official site.
"Adrian Peterson had a surgical procedure done today by Dr. William Meyers, in Philadelphia, Pennsylvania. Dr. Meyers was able to successfully repair Adrian’s abdominal core muscle injury (sports hernia). We expect a speedy recovery with no long-term concerns."
There were no details on when the injury occurred although Peterson missed a few practices in December and was listed on the injury report with an abdominal issue, reports USA Today.