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.
Knee Replacement Approaches. What exactly happens during a total knee replacement surgery? How does the surgeon remove the existing knee joint components and replace them with a prosthetic implant? The surgery begins with an incision into the tissue to allow access to the patella (kneecap) and quadriceps muscle (on top of the upper leg).