The categorization of people by social strata occurs in all societies, ranging from the complex, state-based societies to tribal and feudal societies, which are based upon socio-economic relations among classes of nobility and classes of peasants.
Knee replacement, also known as knee arthroplasty, is a surgical procedure to replace the weight-bearing surfaces of the knee joint to relieve pain and disability. It is most commonly performed for osteoarthritis,[1] and also for other knee diseases such as rheumatoid arthritis and psoriatic arthritis.
A prosthesisâwhich may also be called an implantâtakes the place of the damaged area of the knee, leaving the other compartments intact. (Partial knee replacement surgery may also be referred to as partial knee resurfacing, unicondylar knee surgery, unicondylar knee replacement, or unicondylar knee arthroplasty.)