The sternebrae themselves have little to no nerve supply, it is the periosteum which surrounds the bone that contains the nerves, this is generally elevated back before the osteotomy so generally as you say, the pain is not so bad. GI surgery is usually a lot more painful. This is not to say that you are fine if you don't feel pain, the bone still has to heal which I would guess is an 8-12 week process let alone giving time for the bypass and valve replacement to heal.
Wood can wait, your health can not.
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PS. I love guitars!
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