The literature retrieved for this study was published in both English and Chinese. Articles published from the inception of the database to April 2022 were retrieved from the PubMed, Embase, Cochrane Library, and Clinical Trials databases and Chinese databases, such as the Chinese National Knowledge Infrastructure, Chongqing VIP Chinese Scientific Journals, Wang Fang, and Chinese Biomedicine. The MeSH terms “platelet-rich plasma” and “low back pain” or their entry terms were used as the search terms (a detailed PubMed database search strategy is shown in Figure 1). To collect more eligible studies, a reference list of retrieved studies and related reviews was manually searched, and the process was repeated until no further articles were identified.