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The purpose of the study was to find the relation of cellular component with clinical efficacy in RC tendinopathy and to find the composition of PRP in treating RC tendinopathy.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A total 30 patients were recruited and divided into PRP and control groups. In the PRP group, 2 ml of PRP solution was injected to the hypoechoic lesion of degenerative supraspinatus via 22-gauge syringe with peppering technique. Patients in the control group were taught rotator cuff strengthening exercises. American Shoulder and Elbow Surgeons (ASES), Constant-Murley score, and numeric rating scale (NRS) were measured before, 6 weeks after, 12 weeks after, and 24 weeks after the procedure. PRP compositions were analyzed using the 1 ml of PRP solution.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Linear regression analysis showed no significant difference of ASES and Constant-Murley scores between the groups at 6 weeks (<jats:italic>P<\/jats:italic>= 0.582 and 0.258) and at 12 weeks (<jats:italic>P<\/jats:italic>= 0.969 and 0.795) but showed a significant difference at 24 weeks (<jats:italic>P<\/jats:italic>= 0.050 and 0.048). Independent<jats:italic>t<\/jats:italic>test showed significant group difference of NRS at 6 weeks (<jats:italic>P<\/jats:italic>= 0.031) but not at 12 and 24 weeks (<jats:italic>P<\/jats:italic>= 0.147 and 0.935). 5.19 pg\/ml in IL-1\u03b2 and 61.79 \u03bcg\/ml in TGF-\u03b21 were acquired as cutoff values to predict meaningful improvement. The PRP subgroup above IL-1\u03b2 or TGF-\u03b21 cutoff value showed significant differences in all clinical outcomes compared with the exercise group while the PRP subgroup below the cutoff value showed no significant differences in linear regression analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Our study can help to find the optimal PRP condition and to enhance the effect of PRP on RC tendinopathy.<\/jats:p><\/jats:sec><jats:sec><jats:title>Trial registration<\/jats:title><jats:p>All the patients were registered in our Institutional Ethics Committee (approval number<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"http:\/\/www.e-irb.com\/index.jsp\">2014-05-009<\/jats:ext-link>).<\/jats:p><\/jats:sec>","DOI":"10.1186\/s13018-019-1406-4","type":"journal-article","created":{"date-parts":[[2019,12,2]],"date-time":"2019-12-02T15:09:09Z","timestamp":1575299349000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Effect of platelet-rich plasma on the degenerative rotator cuff tendinopathy according to the compositions"],"prefix":"10.1186","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0479-7526","authenticated-orcid":false,"given":"Sang Jun","family":"Kim","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seung Mi","family":"Yeo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Soo Jin","family":"Noh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chul-Won","family":"Ha","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Byung Chan","family":"Lee","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hyo Sun","family":"Lee","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sun Jeong","family":"Kim","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2019,12,2]]},"reference":[{"key":"1406_CR1","doi-asserted-by":"publisher","first-page":"296","DOI":"10.1016\/S1058-2746(99)90148-9","volume":"8","author":"S Tempelhof","year":"1999","unstructured":"Tempelhof S, Rupp S, Seil R. 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