I’m a physical therapist and jiu jitsu black belt. I have yet to work with a jiu jitsu athlete who wanted to get back following a full knee replacement. Unfortunately there is no research on this topic specifically.
I found this article on return to sport following hip / knee replacements for judo. I think judo would actually be more challenging on the knee than jiu jitsu. Looks like the return to sport data is promising.
Michael Bisping had a double knee replacement and he is doing wild stuff: running, kicking the heavy bag.
Clinically I am most worried about the lack of knee bending and getting comfortable kneeling (kneecap on the mat). Knee flexion (bending ROM) at best will be 140 degrees, and not everyone gets that much ROM. Doing a full kneel might be challenging. Take rehab seriously and get your mobility as good as possible.
There are different implants, some remove the ACL and use a metal post. This implant would make standing passing and dynamic movements more challenging. Some implants spare the ACL. This variant would be much better for maintained athletic movements. You would have to discuss with the surgeon what approach he wants to use and what impact options there are available.
If I get the opportunity to work with a jiu jitsu athlete following a knee replacement I will probably do a case study and talk about it on my social media page: hhttps://www.instagram.com/doctor_kickass/