In recent years, complaints from the knee joint have been increasing day by day due to increased work pace, unhealthy diet, obesity and the effect of environmental factors. Knee osteoarthritis is the most common joint disease and is symptomatic in 10% of men and in 13% of women, who is over 60 years old. The probability of developing symptomatic knee osteoarthritis for life is 45%. Knee osteoarthritis has been described as a multifactorial disease and occurs as a combination of biological and mechanical events. Knee osteoarthritis usually starts from the medial compartment. As a surgical option, it may vary depending on the age of the patients, the degree of activity, the characteristics of the deformity and the extent of degeneration. These options include tibial osteotomy, unicondylar knee prosthesis and total knee prosthesis. The importance of patient selection should be kept in mind for the success of these treatments.