A worker suffered a rotator cuff injury to his left shoulder. He claimed that the injury was caused by either a work incident in which he injured his right shoulder or the WCB-approved rehab he underwent for the right shoulder injury. The Appeals Commission disagreed. He didn’t complain about problems with his left shoulder until six months after the incident that injured his right shoulder. And the medical evidence doesn’t support his claim that he injured his left shoulder in that incident or while doing rehab for the right shoulder injury [Decision No.: 2012-229,  CanLII 11166 (AB WCAC), March 8, 2012].