I would do the amputation, but do whats best for the cat i hope he gets better
one of my RB cats broke his knee and he was around 16yr old at the time my mom told them to fix it he lived for 5 years after that he passed away in 09
one of my RB cats broke his knee and he was around 16yr old at the time my mom told them to fix it he lived for 5 years after that he passed away in 09