Jordy van Sambeeck

Age at surgery is correlated with pain scores following trochlear osteotomy in lateral patellar instability 5 81 Declarations Ethics approval and consent to participate Institutional review board approval was obtained (CMO 2015-1943). All patients received an information letter and were contacted by telephone for explanation of the study and to obtain verbal informed consent. Consent for publication Not applicable Availability of data and materials The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request. Competing interests The authors declare that they have no competing interests. Funding We have received no funding for this study. Authors’ contributions JS initiated the study by defining the research question and purpose of the study with help of SG. JS performed data collection and analysis and drafted the manuscript. SG was the first author to review drafts of the manuscript and gave final approval of the version to be submitted. NV, AK and GH were second reviewers of drafts of the article and added important feedback for interpretation of the results and for discussion section. GH performed the statistical analyses. Acknowledgements We thank Radboudumc for their educational support to JS during the initiation phase of this study. We thank Thomas Hoogeboom for his help with statistical analysis.