Background: Total knee replacement has arisen, with outstanding pain relief and work, as a safe, longer-lasting form of knee arthroplasty. The goal of this research was to examine the therapeutic, functional and radiological aspects of complete knee replacement with BuechelPappas knee Prosthesis for osteoarthritis and rheumatoid arthritis. Material and Methods: Material: Buechal Pappas spinning bearing prothesis was implanted in all the surgeries. Method: The study is a prospective study in which the Meenakshi Medical College& Research Institute from OCT 2016 to SEP 2018 included patients over 50 years of age who have primary knee osteoarthritis and those with rheumatoid arthritis knee who do not respond to conservative treatment. Both cases were implanted with Complete knee arthroplasty using the Buechel Pappas implant Distance balance procedure above the age range of 50yrs. Both patients have cases that do not lead to conservative management. Serious brain defects, poliomyelitis with muscle weakness, or knee joint sepsis were omitted from the study. The study involved 45 total knee replacements. Initially, both patients were judged by the American Knee Society Ranking. To come to a conclusion, pre and post-operative scores were compared. Results: In the American knee society ratings, there was a major change. The pre-operative average score was 27.44 and the post-operative score was 91.5. After the TKR, there was a 70% increase in the ratings. The average functional preoperative score was 34.6 and the postoperative score was 83.5, indicating a functional score improvement of 80 percent after TKR. Conclusions: Total knee arthroplasty with Buechel-Pappas knee resulted in an increase in the patient's functional capacity to return to the pre-disease state, as demonstrated by the post-op society score improvement.