"It will be basically about four months before he picks up a ball, because it will be all soft tissue rehab and strengthening before he actually starts throwing," Reds head trainer Paul Lessard said.
Broxton came out of Wednesday's game when he felt something pull apart in his forearm while pitching in the eighth inning vs. the D-backs.
"It wasn't the worst news possible," Reds manager Dusty Baker said. "It could have been a much more severe operation. There is a silver lining that it wasn't in the ligament. It wasn't in the joint. He could be ready in 5-6 months, hopefully."
In 34 games this season, Broxton is 2-2 with a 4.11 ERA and 25 strikeouts over 30 2/3 innings. He's allowed 27 hits and walked 12. He was on the disbaled list from June 15-Aug. 9 because of a flexor mass strain in his right elbow.
Mark Sheldon is a reporter for MLB.com. Read his blog, Mark My Word, and follow him on Twitter @m_sheldon. This story was not subject to the approval of Major League Baseball or its clubs.