Anterior cruciate ligament (ACL) injury is common in sports that include 'change in direction' tasks. The aim of the current study was to determine the association between T2 relaxation time (an indicator of ACL integrity) of the distal portion of the ACL sub-region, biomechanical loading factors of the ACL, sex, and sport status of the participants. Participants between 18 to 35 years performed unanticipated 'change in direction' trials at their maximal self-preferred speed. The maximal knee flexion angle and the valgus moment of the right knee during the weight acceptance phase were analysed. MRI data (T2 relaxation time) of the ACL was also collected. Among the independent variables involved in the linear regression model, the association of the valgus moment and sex were statistically significant (p = 0.01 and p = 0.001 respectively). In conclusion, the main finding of the study is that higher T2 was significantly associated with a higher valgus moment as acute response to the 'change in direction' tasks. New sentence: In conclusion, the main finding of the study is that higher T2 was significantly associated with a higher valgus moment during 'change in direction' tasks.

Department of Diagnostic Radiology Oulu University Hospital Oulu Finland

Department of Kinesiology University of Massachusetts Amherst MA USA

Human Motion Diagnostic Center Department of Human Movement Studies University of Ostrava Ostrava Czech Republic

Institute for Research and Applications of Fuzzy Modeling University of Ostrava Ostrava Czech Republic

Research Unit of Health Sciences and Technology Faculty of Medicine University of Oulu Oulu Finland

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