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Ultrasound physiotherapy to a man's left knee following a sports injury. The physiotherapist directs the ultrasonic beam to the site of pain (at centre). The use of high-frequency sound waves to treat soft-tissue injuries is thought to work by improving blood flow. Ligaments, muscles and tendons may feel warm and tingle during therapy. If pain persists, then an arthroscopic investigation of the knee joint may be needed. This surgical procedure allows direct inspection of the knee joint.
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