Thiago Silva re-injured his back and is unable to fight Tim Boetsch at UFC 117.
Multiple sources close to the event today confirmed with MMAjunkie.com that Silva is benched and that a search for a replacement opponent is underway.
UFC 117 takes place Aug. 7 at Oracle Arena in Oakland, Calif., and features a headliner between middleweight champion Anderson Silva and challenger Chael Sonnen.