brit1996 said:
I'm 19 and i've only been out of canada for 8 months and yes the condition has prevented me from returning.
Since you say the surgery is recent, it alone will probably not be enough in a H&C case since it can't explain the previous several years you resided outside Canada. As mentioned though, since you are still very young your chances of getting a PR TD is quite high since you can state you were removed from Canada by your parents while you were still a minor, and are looking to return now that you've passed age of majority.
What complicates your case here is that you've already somehow submitted an app for PR card renewal 4 months ago. Did you submit your H&C reasons for not meeting RO at that time?
Even if you now try to withdraw that app (not sure the best way to do this), CIC may have already started processing it and looking into your RO. They may have already found you in violation of RO, and begun steps to revoke your PR. A withdraw of the app would not prevent this. If this happens and you soon get notice of it, you will have the chance to either submit your H&C reasons, or return to Canada to appeal. Again considering your age, there's a good chance the appeal would be successful.