What would you suggest for a knee with no ACL, bad meniscus damage and cartalidge that looks like the surface of the moon?

Doctors say they won't replace it with a "artificial" knee until I'm 60. They said the only option is a cadaver knee, and that's months and months of imobilization and a whole lotta money that I don't have.

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If it ain't broke, and you mess with it long enough, it will be.