Rob Gronkowski undergoes back surgery; timetable for return unknown

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After a record-setting 2011, Rob Gronkowski has struggled with injuries, resulting in five surgeries.

After a record-setting 2011, Rob Gronkowski has struggled with injuries, resulting in five surgeries.

In 11 games last season, Gronkowski had 55 catches for 790 yards and 11 touchdowns. He missed five regular-season games with forearm and hip injuries and the AFC championship game, a 28-13 loss to the Baltimore Ravens, after he re-broke his forearm.