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This is Dr. David
sounds like you are having bad arthritis and inflammation and effusion fluid in the left knee
this can happen after the other knee TKR if you are bearing more weight on your left leg.
your doctors should check the fluid for uric acid crystals which can be formed from gout in the fluid.
you might benefit from platelet-rich plasma injections into your left knee to help with healing and reduce inflammation.
if the arthritis inflammation and pain continue in the left knee, you might need a TKR on the left side in the future.