I'm approaching 3 years and my scar went awry about 9 months out. Got red and bumpy and sore and ropey. Very tender, etc.. I am quite certain that it is about personal skin types and nothing at all about who your surgeon was. My surgeon was also trained in plastic surgery, gave me a beautiful little 4.5 inch cut that was healing beautifully and then just went kaput. The sternum, back shoulder and some other areas where there is alot of movement are prone to keloid or hypertrophy.
Some people recommend plastic surgery. They cut out the scar and try again. My surgeon's opinion was that it will just hypertrophy all over again.
I ended up going to my acupuncturist and after 4 sessions, the area she was working on began to show marked improvement. Just getting the blood circulating properly to let the scar ammend itself. I need to go back and work on the lower half of the scar. It's so expensive, and not in the cards right now. But quite honestly, I think some massage, some accupuncture and time were what finally helped me out of the ghastly bright red, sore and tender ropey situation.
We've discussed this a lot, so you could always do a search here on scar, hypertrophy, keloid, etc.. and come up with some other ideas. Different things work for different people, it seems. For me, I got really tired of its being so sore. It still is, very tender, but not so that I wince anymore. It will probably be perfect in 15 years when it's time for the next surgery!!
Good luck! You're in the same boat with a whole lot of us. I don't know what the percentage is, here, but you certainly are not alone.
Marguerite