I had to have a second TKR on my right knee as the first one failed after only three years.
The knee was never right, even from the start, and it got worse as time went on.
An MRI showed it was coming apart and had to be replaced. This was done almost exactly a year ago and the knee is now fine, great even.
However my hip, bum and lower back were badly affected by the failure of the first knee joint as I could never walk properly. I am still having treatment, spinal injections, to help with this.
The new knee is good, however.