Dolphins QB Tannehill to undergo season-ending surgery

Miami Dolphins quarterback Ryan Tannehill is undergoing season-ending surgery to repair his anterior cruciate ligament in his left knee, NFL Network Insider Ian Rapoport reported Friday. The Miami Herald first reported the news.

Tannehill originally suffered a partially torn ACL late in the 2016 season, forcing him out of Miami's final three regular-season games and AFC Wild Card loss to Pittsburgh. Instead of surgery, the quarterback opted for stem-cell therapy and rehab over surgery. After the same knee buckled during practice last week, that decision proved costly.