My sister had a replacement done about 5 years ago. She went to the first rehab session and decided that the pain was too much to bear. She cancelled all rehab. Now 5 years later she is totally happy with the replacement. She is pain free. However, her knee is frozen -- locked in position and can't be bent. She is happy as can be, and just accepts the frozen knee. She walks stiff legged with a cane, and uses a mobile shopping cart in stores. She tells everyone that for her the pain of rehab was not worth having a flexible knee.