In February 2013, Gronkowski was diagnosed with an infection in his forearm.
He underwent an open procedure—the third on his forearm—in an effort to clear the infection; he was subsequently placed on a course of antibiotics.
On May 20, 2013, Gronkowski underwent a fourth surgery on his forearm to replace the hardware implanted in the second procedure and perform tissue biopsies.
ESPN's Adam Schefter reported that doctors were encouraged the infection had finally resolved.
On June 18, 2013, Gronkowski underwent back surgery
He was cleared to play for the October 20, 2013, game against the New York Jets
In his return, he recorded three 100-yard receiving games in a six-game stretch.
During a game against the Cleveland Browns on December 8, 2013, Gronkowski suffered a right knee injury after a direct hit from safety T. J. Ward.
Gronkowski tore his ACL and MCL, which prematurely ended his 2013 season.
In seven games, Gronkowski produced 592 receiving yards and four receiving touchdowns in six starts.[101] Gronkowski was ranked 41st by his fellow players on the NFL Top 100 Players of 2014.
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