FOXBOROUGH, Mass. — New England Patriots tight end and Woodland JHills graduate Rob Gronkowski underwent back surgery on Tuesday, his fourth operation this year.

The latest surgery was performed by Dr. Robert Watkins and was successful, said Drew Rosenhaus, Gronkowski’s agent.

On May 20, the Patriots star had the most recent operation on the left forearm that he broke on Nov. 18 while blocking for an extra point in a 59-24 win over the Colts. He had an operation soon after, the first of four on his forearm.

He broke it again in the Patriots’ first playoff game, a 41-28 win over the Houston Texans on Jan. 13, and has had three forearm operations since then. Rosenhaus said the surgery performed last month was expected to be the last on his forearm.