I am Dr. Arch Miller, and I am a reconstructive surgeon. I am on the reconstructive surgery forum. If the pain you describe is only during chest motion, the it is possible that your sternum is unstable. I would recommend that you get a 3D CT scan and this will give evidence of a fracture, wires breaking and instability. This can be fixed with a device now used in CT surgery called a Talon. Go to the rapidsternalclosure.com web site to see it demonstrated. It is possible that this may be the source of your pain.
arch s miller ms md facs
Burning chest discomfort with exercise 11 years after the bypass surgery is likely due to the heart and not the incision or scar. Talk to your doctor but likely you need at least a stress test.