Injury, performance, and recovery.

Shoulder pain does not automatically mean a rotator cuff tear. The history and examination help decide whether X-ray, ultrasound, MRI, or no imaging is most useful.
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PRP may improve pain and function for some arthritic knees, but trials do not agree and the treatment has not been shown to regrow lost cartilage.
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A focused examination comes first. Ultrasound can answer selected questions about tendons, ligaments, fluid, and superficial soft tissues, but it does not replace every X-ray or MRI.
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