Why is it necessary? of Knee replacement

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Knee replacement is most often carried out in people whose knees are affected by osteoarthritis. This results from excessive wear of the knee joint, leading to pain, swelling and stiffness. The cartilage, which is normally smooth and lubricated by synovial fluid, becomes thin, and rough and may completely wear away in places. New outgrowths of bone may occur on the joint surfaces. This leads to pain, swelling and a reduction in the range of movement of the affected knee.

Other reasons include rheumatoid arthritis, gout or knee damage due to injury.