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The most common cause of knee pain is arthritis, which is caused by the joint deteriorating. The knee, hip, and spine are the most typically affected weight-bearing joints. The utmost cause for knee replacement surgery is osteoarthritis. Arthritis is a common condition that refers to inflammation and swelling of one or more joints in the body. There are several types of arthritis, but the most prevalent type is osteoarthritis. • Osteoarthritis, also known as degenerative joint disease or wear-and-tear arthritis, is the most common form of arthritis and affects millions of people worldwide. It typically occurs with age as the cartilage that cushions the joints gradually wears away, leading to joint pain, stiffness, and loss of function. Osteoarthritis can affect any joint in the body, but it most commonly affects weight-bearing joints such as the knees, hips, spine, and hands.