That is interesting. I have a TKR and used to ride with sneakers and pedals that had the small pins and my feet did not move. Reluctantly I switched to SPD cleats for the other advantages and found with the float in the pedal my foot and knee go where they want and have no problems. In the end you will want to do what you feel comfortable with. Originally I was afraid of even riding for fear of falling and damaging knee. I know go about my life as if it were the original except for running.