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AG is also president and a shareholder of Boston Imaging Core Lab, LLC (BICL), which provides image assessment services. FWR is a shareholder of BICL. JLT\u2019s institutes have received funding from Arthrex and Biomet for conducting RCTs on the value of PRP in hamstring and Achilles tendon injuries. JLT received no personal compensation.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"Abdulaziz Farooq kindly provided statistical advice for this manuscript.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Statistics and biometry"}},{"value":"Institutional Review Board approval was obtained.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"Written informed consent was obtained from all subjects (patients) in this study.","order":6,"name":"Ethics","group":{"name":"EthicsHeading","label":"Informed consent"}},{"value":"Some study subjects have been previously reported in:\n                  Wangensteen A, Tol JL, Roemer FW, Bahr R, Dijkstra HP, Crema MD, Farooq A, Guermazi A. Intra- and interrater reliability of three different MRI grading and classification systems after acute hamstring injuries. Eur J Radiol. 2017 Apr;89:182\u2013190. doi: 10.1016\/j.ejrad.2017.02.010. Epub 2017 Feb 11.\n                \n                  Wangensteen A, Almusa E, Boukarroum S, Farooq A, Hamilton B, Whiteley R, Bahr R, Tol JL. MRI does not add value over and above patient history and clinical examination in predicting time to return to sport after acute hamstring injuries: a prospective cohort of 180 male athletes. Br J Sports Med. 2015 Dec;49(24):1579\u201387. doi: 10.1136\/bjsports-2015-094892. Epub 2015 Aug 24.","order":7,"name":"Ethics","group":{"name":"EthicsHeading","label":"Study subject or cohort overlap"}},{"value":"\u2022 prospective\u2022 observational, prognostic\u2022 performed at one institution","order":8,"name":"Ethics","group":{"name":"EthicsHeading","label":"Methodology"}}]}}