Received: 11 July 2019
Accepted: 9 January 2020
First Online: 20 January 2020
Ethics approval and consent to participate
: Our retrospective study was exempted from Ethics Committee approval after review by the Medical Research Ethics Committee of the South-Eastern Norway Regional Health Authority due to the fact completely anonymized data was used. Data were collected, stored and analyzed in strict compliance with data protection and athlete confidentiality. Informed consent was waived because all our epidemiological data was anonymized and unidentifiable. An institutional review board (IRB) approval was obtained from Boston University (#H-36593).
: We obtained approval from the IOC to use anonymized imaging and demographic data for publication.
: Ali Guermazi is the President of Boston Imaging Core Lab (BICL), LLC, and a Consultant to MerckSerono, AstraZeneca, Pfizer, GE Healthcare, OrthoTrophix, Sanofi and TissueGene. Frank Roemer, Asim Mian and Michel Crema are shareholders of BICL, LLC. Lars Engebretsen is a consultant to Arthrex and Smith and Nephew. Daichi Hayashi, Mohamad AbdalKader, and Mohamed Jarraya have nothing to disclose.