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Gronk had back surgery in December<p>Back injuries are notoriously tricky, so when the Patriots announced in December that Rob Gronkowski would miss the remainder of the 2016 season after back surgery, it was easy to panic. Would that injury rob him of the chance to make his case as the game’s …

Read more at CBS Sports: http://www.cbssports.com/nfl/news/watch-patriots-rob-gronkowski-certainly-looks-healthy-in-this-back-workout-video/