Which aspect of knee joint mechanics is primarily affected by osteoarthritis?

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Osteoarthritis is a degenerative joint disease characterized by the breakdown of cartilage, which is crucial for the smooth functioning of joints, including the knee. As the cartilage deteriorates, it can lead to pain, stiffness, and reduced range of motion in the knee joint. This degeneration is a central feature of osteoarthritis, as it directly impacts the joint's ability to handle mechanical loads and facilitate movement without causing discomfort.

While muscle strength, joint lubrication, and bone density can be affected by osteoarthritis, the primary mechanical aspect that osteoarthritis directly impacts is the degeneration of cartilage. This degeneration fundamentally alters the joint's mechanics, leading to the symptoms commonly associated with the condition.