What Causes the Knee to Be Stiff?
Knee stiffness can be attributed to a range of causes. One common cause is arthritis, particularly osteoarthritis, which results in the breakdown of the knee joint’s cartilage, leading to pain and stiffness. Injuries such as ligament tears or fractures can also cause stiffness, as can conditions like bursitis, which involves inflammation of the small fluid-filled sacs around the knee joint. Post-surgical stiffness is another common issue, particularly after knee replacement or ACL reconstruction surgery. Lastly, non-use or prolonged immobility of the knee can also result in stiffness, due to muscle atrophy and joint contracture.
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