Knee pain can be caused by disease or injury. Among American adults, approximately 25% have experienced knee pain affecting the function of the knee. The prevalence of knee pain has increased over the past 20 years, with osteoarthritis being the most common cause in individuals over the age of 50. Knee pain that is caused by injury is most often associated with knee cartilage tears. Knee injuries can occur as the result of a direct blow or sudden movement that strains the knee beyond its normal range of movement. Knee pain can cause difficulty performing activities such as walking, rising from a chair, climbing stairs, or playing sports. Physical therapists are specially trained to help diagnose and treat knee pain, and help individuals return to their normal activities without pain or limitation.
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