Background: Osteoarthritis knee is an important cause of disability in women and 8th in men. Uni-compartmental involvement of knee joint is more common in osteoarthritis leading to various deformity and pain in the knee. Objective: To analyse the outcome based on the functional and radiological evaluation. Methods: The study is an observational study with a prospective study design at Acharya Vinoba Bhave Rural Hospital (AVBRH) in the Orthopaedic department. Patients who are diagnosed with osteoarthritis of the knee based on X-rays will be analysed on their clinical, functional and radiological outcomes based on Oxford Knee Score and Tegner Lysholm Knee Score. The patient will be chosen based on age above 50 years and the ones who agree to participate in the study. Patients with varus deformity of more than 10 degrees and the ones with knee instability will be excluded from the study. Assessment of patient will be done based on Oxford knee scoring and Tegner Lysholm knee score The patients will be scored pre-operatively and post-operatively to evaluate the relief from pain or the symptoms before the surgery and after the surgery and scoring will be done and will be compared. Expected Results: High tibial osteotomy is expected to help reduce the pain in osteoarthritic patients, which hampered their daily activities. This surgery will help assess the pre-operative and post-operative scores which will be assessed based on Oxford knee score and Tegmen Lysholm score.