There's no way of knowing how much consideration you've given, or discussion you've had with your doctor, about replacing your original God given knee, but if you should go down that road it's likely the only regret you'll have is that you waited too long, and put up with too much pain, before doing it. It's only a couple of days in the hospital and several weeks of rehab. How much rehab depends a lot on how seriously you follow instructions, but the more you put into it, the shorter it takes. Think in terms of weeks, not months and how great it will be not to ever think about your knee, before considering whether to do something you want to do.
Good luck whichever road you choose and thanks for your work with film