Surgeons have preferences in the knee implants they provide to their patients. These preferences can reflect their training or the implants their operating make available. The implant manufacturers can play an influential role. What matters most is what patients prefer. Patients can definitely tell most of the time differences between one knee implant and another. Patients have preferences and this video describes how by a completely controlled study run for more than 30 years Dr. Pritchett figured out what knee implant designs are better for most patients and why!