I guess this is sort of relevant to drumming, because I had my right knee replaced in July of 2017. This is just a word of caution to anyone considering a knee replacement. Do your homework and YOU pick the surgeon. Don't let the orthopedic group say to you, Dr. so and so will be doing your surgery. This is what happened to me and as a result, after 18 months, I can only bend my knee, at best when I force it, to 90 degrees and I still experience some pain. The surgeon they picked was not their best and I even suspect he might have been low man on the totem pole. While he is still working for the same group, he is no longer doing surgery. Oh and by the way, he is in his mid 50's and a little young to be contemplating retirement. This tells me others had problems with him as well, so they probably took the scalpel away from him. The good news, I can walk with no problem and still play the drums. The bad news, because of the lack of flexibility, I have extreme difficulty with coming down the stairs and have nearly fallen twice. Again, please do your homework and get the RIGHT MAN or WOMAN. Otherwise, you could be disabled for the rest of your life, which is exactly where I now see my self.