effectiveness and relevant factors of platelet?rich plasma treatment in managing plantar fasciitis: a systematic review

background: plantar fasciitis (pf) is a common foot complaint, affects both active sportsmen and physically inactive middle age group. it is believed that pf results from degenerative changes rather than inflammation. platelet?rich plasma (prp) therapy has been introduced as an alternative therapy for pf. this study is aimed to systematically review to the effectiveness and relevant factors of prp treatment in managing pf. materials and methods: a search was conducted in electronic databases, including pubmed,scopus, and google scholar using different keywords. publications in english?language from 2010 to 2015 were included. two reviewers extracted data from selected articles after the quality assessment was done. results: a total of 1126 articles were retrieved,but only 12 articles met inclusion and exclusion criteria. with a total of 455 patients, a number of potentially influencing factors on the effectiveness of prp for pf was identified. in all these studies, prp had been injected directly into the plantar fascia, with or without ultrasound guidance. steps from preparation to injection were found equally crucial. amount of collected blood, types of blood anti?coagulant, methods in preparing prp, speed, and numbers of time the blood samples were centrifuged, activating agent added to the prp and techniques of injection, were varied between different studies. regardless of these variations, superiority of prp treatment compared to steroid was reported in all studies. conclusion: prp therapy might provide an effective alternative to conservative management of pf with no obvious side effect or complication. the onset of action after prp injection also greatly depended on the degree of degeneration.