According to the Lancet Feb 2019
82% of Total knee replacements will last 25 years
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(18)32531-5/fulltext
57% of Total hip replacements will last 25 years
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(18)31859-2/fulltext
I can confirm that according to the NJR, only 1.4% of the 855 Total hip replacements performed by myself and 1.1% of the 515 Total knee replacements performed by myself have been revised 10 years after implantation.