We did exactly the same and I never expected that things would start to deteriorate so fast with my health. First it was an unexpected gall stone the resulted in a gall bladder removed. Then a series of mishaps and operations started and the saga continues. Problem that each mishap became more dangerous.
So now I don't consider the knee as a serious threat, as it will not kill me.
Touch wood that I don't fall of a ladder now, as with my luck thety will think that I conned it hahaha.