Introduction
knee arthroplasty, designTo increase, TKA, pain
Total knee arthroplasty (TKA) is a very successful operation with an excellent outcome and survivorship results. Patient satisfaction is one of the important outcome measurements because it reflects the overall pain relief and an ability to return to normal activities of daily living after knee replacements. However, only approximately 75% of patients who had a knee replacement satisfied with the total knee arthroplasty (TKA) [Not only the surgical technique but also an innovative implant development might be the factors increasing the outcome [In 2013, Depuy Synthese launched the gradually reducing radius (GR) design (ATTUNE, Depuy Synthes, Warsaw, Indiana). The GR design allows smooth transition from knee extension to flexion by create a point of rotation similar to the “J curve” in the native knee, Fig.  Showed the sagittal femoral component between gradually reducing radius (GR) and multi-radius (MR) designTo increase the TKA outcome, modern knee prostheses are designed to match a native knee geometry, which anticipated to mimic the knee kinematic close to a normal knee [