According to Rafael Cordeiro, the UFC actually made the decision to remove Mauricio Rua from a scheduled UFC on FOX 19 clash with Rashad Evans.
Mauricio Rua's quest for his first winning streak since 2009 was halted when an injury forced him out of an April 16th clash with fellow former UFC LHW champion Rashad Evans. In an interview with MMA Fighting, Kings MMA coach Rafael Cordeiro revealed that a lingering knee problem will keep Shogun out for an undetermined period of time, and it was actually the UFC's call to pull Rua out of the fight.