HEALTH TOPICS 
Platelet-rich plasma therapy
Harnessing the healing power of these blood cells is intriguing, but research is lacking.
Times have changed since the days of bloodletting, when doctors treated their patients by taking blood out of them. Now a procedure called platelet-rich plasma therapy has emerged that involves injecting a portion of the blood back into an ailing joint. You might say it's bloodletting in reverse.
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