The BMC rider was forced to withdraw from the USA Pro Challenge last month with the alignment and has decided to rest it for the remainder of the season.
There had been fears that Evans' knee might have been damaged or had an off-and-on low grade infection but tests came back negative.
Nevertheless, Evans has taken the decision to skip planned races in Québec City and Montreal this season to ensure he is in top shape for 2013.
"I'm disappointed surely, but in the end, there's nothing I can do," he said.
"I wanted to come back and race this year but it could possibly compromise my 2013. At this point, we can't afford to do that. So I'll completely recover and do what I can to be back to my normal level next year."
BMC's chief medical officer Dr. Max Testa added: "Considering there are so few races left, and with his current level of fitness, the medical staff and management decided to make this the end of his season."
The team's directeur sportif, John Lelangue, also backed the move: "We want for him to be competitive in 2013. There is only the world championships and the Tour of Lombardia as big races where he could have been one of the favourites.
"But you have to be 100 per cent for those races and with his actual state now, it's a wise decision to stop now and totally rest and recover and then rebuild for next season."