How can I predict Otoplasty failure?

  It is impossible to determine if a touchup procedure is going to be required after the otoplasty procedure. The procedure involves placing permanent sutures in the ear cartilage once cuts had been made in the ear cartilage to recreate  the anti-helical fold. If the stitches pop out in the initial postoperative period, the ear may become more prominent and asymmetrical to the opposite side. These can be repaired under local anesthesia the same way as the primary procedure is performed.

Otoplasty is a very reliable procedure when performed by an experienced facial surgeon. Failure of an otoplasty typically results from one of the ears being pulled on early after surgery as opposed to a failure of the surgery itself. Asymmetry is typically on the order of a couple of millimeters but far short of any asymmetry that is noted on casual inspection of the ears. You can increase your chances of success by only consulting with experienced otoplasty surgeons who have many pleasing before and after photos. I hope this information is helpful for you.Stephen Weber MD, FACSDenver Facial Plastic Surgeon

is not really possible.  If done correctly and the healing is as expected, you can achieve your goals.  If you're worried about failure, ask your surgeon for the revision policy and what costs you are looking at if you results relapse to what you started with.  But this if very unlikely and it is more likely to have some other issue that may require a tweak to get the best result.