Background: Osteoarthritis (OA) commonly known as wear and tear arthritis. While it can occur even in young people, the chance of developing osteoarthritis rises after age 45. Proximal bular osteotomy (PFO) for young patients of OA knee joint is turning out to be an emerging concept with promising results. The aim of our study was to evaluate clinical, radiological and functional outcomes of PFO in young patients of primary medial compartment osteoarthritis of knee joint. Total 13 patients (20 knees) with moderate to severe pr Method: imary osteoarthritis of knee joint, who underwent PFO, were enrolled. Clinical data, Visual Analogue Scale score (VAS), Knee Society Score (KSS), Medial Knee Joint Space (MJS) and Femorotibial Angle measurements (FTA) were recorded. Patients were followed up at one, three, six months and yearly, postoperatively. 20 knee joints PFO. The mean VAS scores signicantly decreased from Results: 8.25 preoperatively to 2.21 at 12 months postoperatively. In most of patients, signicant medial pain relief was observed after PFO. Mean KSS at preoperative stage was 44.15, which was improved to 77 at 12 months postoperatively, which further suggests improvement in knee joint functions. There was noteworthy increase in Mean joint space postoperatively (1.17) as compared to preoperative stage (0.34). Mean FTA reduced from 182.64 degrees preoperatively to 178.61 at nal follow up. Our study shows Conclusion: that PFO remarkably causes pain relief and improves knee functions with increase in MJS and slight correction of varus deformity in young patients with primary osteoarthritis of knee joint.