@tonycn. I think all doctors only do a couple of different brands of replacements so that’s not unusual. When you think of it, that allows the doctor to be very familiar with that hip or knee so he or she can do a better job. Working with too many would make it more difficult to be the best with each type.
The doctor who did my second knee gave me two options to choose from. I choose a custom made knee, Conformis, because I had heard excellent things about it, plus he was one of the developers of it so of course he would the knee to be a success. The other knee he offered was Depuy.
JK