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The correlation between knee kinematics and self-reported outcome794Recent findings show that high demanding functional tasks that contain explosive power or the complexity of a landing after a jump, are necessary to investigate rTR.49 It has been shown that walking gait biomechanics do not correlate with more demanding jump landing outcomes after ACLR.37Therefore, high demanding functional tasks may more readily reveal the influence and relation of psychological and biomechanical factors during rehabilitation compared to level walking or other low demanding tasks. To our knowledge, the existing literature regarding the relationship between rotational and translational lower limb kinematics and patient reported outcome is limited. This knowledge is needed to better understand why some patients do and others do not successfully return to sport. The primary purpose of this study was to evaluate the strength and direction of the correlation between objective lower limb kinematics (rTR and ATT) and patient reported function as well as psychological readiness to return to sports during level walking, a single-leg hop (SLH) landing, and a side jump one year after ACLR. It was hypothesized that during high demanding functional movements (SLH and side jump) stronger correlations between objective lower limb kinematics and patient reported function and psychological readiness will be seen than during low-to-moderate tasks (level walking).MethodsTwo large hospitals in the Netherlands included the subjects for this multicenter prospective cohort study. The study protocol was reviewed and approved by the Institutional Review Board of the University Medical Center Groningen (registration ID 2015/524, UMCG trial register no. 201501098). The trial was registered in the Dutch Trial Register (NTR: www.trialregister.nl, registration ID NL7686). ParticipantsPatients scheduled for ACL reconstruction between June 2016 and June 2018 were screened whether they were eligible to participate in this study. Mark Zee.indd 79 03-01-2024 08:56