hip revision is usually replacement (redone) of the original THR
revision surgery is more complicated than the original THR.
that is why timing is of the utmost importance in THRs....you really only want to be going through the procedure one time only if possible
I waited until I was 58 for my THR and in retrospect endured too much pain in my effort to reach an age where a one time only THR would last a lifetime....if that makes any sense
plenty of revisions are successful but the procedure is more complicated