Conventional Total Knee implant allows a person to have good range of motion of knee however now High Flex Knees and Unicondylar Knees are also available High Flex Knee gives full flexion to the patient thereby allowing sitting on the floor. Unicondylar Knees also known as half joint replacement are indicated for very early arthritis and when only one half of the joint is involved You and your surgeon can discuss the most suitable implant for yourself.