The replacement joint does not have quite the range of motion that a real knee has. However, with a bit of time you can come very close to a real knee. I can kneel on the bionic knee as well as the real knee without any problems. I can also squat and come very close to touching my butt on my heel on the bionic knee side and get uo with a good tug on the truck tailgate or something solid. Or just go to a kneel and get up from there. If you push the knee beyond it's design there will be enough pain to tell you it's time to stop. It's no big deal, though. The real problem with kneeling is that the knee cap has a wear plate installed in the inside to prevent the steel joint from wearing the knee cap through. This makes the knee cap on the bionic knee stick out a bit higher. You kneel down on a hard surface like concrete or tile and it is not pleasant without a knee pad. On a carpet or on dirt you don't notice it at all. You CAN kneel on hard surfaces without a knee pad, but it is not fun. My sister has had both knees replaced and it has been enough years since they were done she can squat and get up from that position also. My knee was done 7 years ago and I do not know if the technology has changed any since. Different people have different results, of course. Basically, those who do what the doctor told em to do are happy with the results, and those who don't do what the Doc told em, have much longer recoveries.
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