See post by cmd2468 Im 48 post op 6 wks
Well, without the relevant clinical details it would be inappropriate to comment on the best advised management plan in your case. Though knee replacements work well, one must keep in mind that this would be a major surgery and may last just 8-15 years. I would suggest discussing the available options in detail with your orthopedician. If in doubt you may seek a second opinion with another orthopedician.
Hope this is helpful.