I've never had any reconstructive surgeries like you're looking at so I'm no expert... but... I don't think "you are never as good as you originally were" is an accurate blanket statement. I know many surgeries are equal to or even stronger than original.

I wouldn't worry about it effecting your medical in the long-term. You'll do the surgery and rehab and probably do a demonstrated ability test with the AME - or whatever it's called. I've got a buddy who was t-boned while riding a motorcycle and he had several reconstructive surgeries and he's back flying. He was pretty messed up so it took a while to regain strength which slowed down the FAA process but he's back. Yours isn't anywhere near what he had so I wouldn't worry about it.