Patriots tight end Rob Gronkowski had a third surgery on his left arm last week, according to a report on Twitter by ESPN’s Adam Schefter. The third surgery was for an infection. Gronkowski broke his left forearm in November, then broke the same arm in a playoff game vs. the Texans in January. He had surgery after each injury. Schefter reported the infection was caught early enough that it will not cause him to miss “any extended time” and he will likely be ready to play by training camp in late July.