Platelet-Abundant Plasma Platelet-prosperous plasma injections are made up of your own private blood plasma that contains a large concentration of platelets, also known as thrombocytes, which might be little blood cells which have been involved in blood clotting. Cochrane Database Syst Rev 2009;4:CD003115. As you will find several modest experiments https://www.theorthopaedicandpainpractice.com/understanding-and-treating-elderly-knee-pain/