Platelet-rich-plasma (PRP) is the cellular component of the plasma with a higher percentage of platelets compared to total blood. Since it contains a number of growth factors, PRP injections in sports injury treatments became common today. However, there is no good evidence that PRP could be beneficial for people with knee cap pain.
Örsçelik 2015. Comparison of single and triple platelet rich plasma injections in the treatment of patellofemoral pain syndrome.