A few days ago, UFC middleweight Jorge Rivera announced that he would be forced to withdraw from his UFC 118 bout with Alessio Sakara due to an injury sustained in training. Today, "El Conquistador" shares some more bad news with the Boston Herald's Dan Duggan: Jorge Rivera immediately knew he had seriously injured his left arm. During a recent training session at Tim Burrill Jiu Jitsu, Rivera attempted a takedown and his grappling partner, Radhames Familia, sprawled on his arm. Rivera heard a snap and knew he was in trouble. The result was a broken ulna, one of the two bones in the forearm... Rivera initially hoped that he’d be ready to return to action in late September or October, but he’ll get a better idea of the timetable after a doctor’s appointment on Wednesday. "I was hoping that I would be able to let it heal," the Milford native said. "I had no idea how much went into recovery. It’s nowhere near what I thought it was like. So it’s just going to take me a lot longer than I would have hoped... It sucks... It’s very disappointing to walk away from fighting in Boston."