Knee osteoarthritis is one of the most common joint disorders, and it causes severe pain and immobility. Total knee replacement (TKA) is very effectively relieves pain and improves knee function in patients with late-stage knee osteoarthritis. However, TKA is expensive and complex, and some patients need a second revision. The study included patients with medial compartment osteoarthritis, who were treated by proximal fibular osteotomy. The patients were diagnosed of knee osteoarthritis by American College of Rheumatology criteria and severity of disease was graded by Kellgren and Lawrence grading system. In our study, total number of patients was 27. Among them 3 were bilateral cases. Hence total number of knees was 30. Among 30 knees, 14 were right knees and 16 were left knees. The diagnosis of stage of osteoarthritis was done by using Kellgren and Lawrence classification system. Among 30 knees, 16 cases were in Stage 2, 13 cases were in Stage 3 and 1 case was in Stage 4.