In this study, the results of total knee arthroplasty (TKA) were reviewed for more than three years after surgery using Genesis II. The subjects were patients who had underwent TKA between 2006 and 2008 using Genesis II (Smith & Nephew). Sixty-seven joints were observed. They consisted of 46 joints with knee osteoarthritis (OA) and 21 joints with rheumatoid arthritis (RA). The average age at surgery was 73.5 years. Of the 46 OA joints, PS type joints were used for 42 and CR for four. PS type joints were used for all 21 RA joints. The patella was replaced in all patients except four. The results were evaluated according to the JOA score, Barthel Index, range of motion of knee, X-rays, and complieations found. The average JOA score improved from 53 points before surgery to 79 points and the average Barthel Index from 70 to 97 points. The range of motion improved from -14-112 degrees before surgery to 0-122 degrees. Implants were placed at angles of α 97, β 90, γ 3, and δ 86. The mean FTA was 181 degrees before surgery, and 174 degrees at the last observation. Postoperative complications were delayed wound healing in three joints with OA, progressive valgus in two joints, infection in two joints, and delayed wound healing in one RA joint. The postoperative rasults of the patients in this study were generally good because they were short-term results. Follow-up over a longer term in required.