The latest, most "anatomical" knee
Over the years that surgeons have been doing knee replacements for their patients, the knee has not been anatomical. In other words, the usual movement of a knee when it bends and straightens also involves a twisting or pivoting movement which allows the points of maximum weight bearing to shift throughout the flexion cycle in a reliable, reproducible pattern. This is what allows for the best range of motion and function of the knee. Furthermore the actual knee is not Symmetrical - in other words both sides the same but rather differ in size & shape to achieve this phenomenon. Smith & Nephew, the supply company that I use, has developed an "anatomic" knee that very closely mimics the movement of your natural knee.
It is expensive, but the knee that will mimic the natural knee movement the closest, is certainly worthwhile considering for better function post Total Knee Replacement.