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.
During knee replacement surgery, knee joints damaged by arthritis can be replaced with an artificial knee, also known as a prosthetic knee. A prosthetic knee can help restore mobility and reduce pain in the affected knee. When the joints of both knees are damaged, double knee replacement may be recommended.