Doherty, CailbheCailbheDohertyBleakley, Chris J.Chris J.BleakleyHertel, JayJayHertelCaulfield, BrianBrianCaulfieldRyan, JohnJohnRyanDelahunt, EamonnEamonnDelahunt2017-05-052017-05-052015 Wiley2015-12Scandinavian Journal of Medicine and Science in Sportshttp://hdl.handle.net/10197/8474No research exists predicating a link between acute ankle sprain injury-affiliated movement patterns and those of chronic ankle instability (CAI) populations. The aim of the current study was to perform a biomechanical analysis of participants, 6 months after they sustained a first-time acute lateral ankle sprain (LAS) injury to establish this link. Fifty-seven participants with a 6-month history of first-time LAS and 20 noninjured participants completed a single-leg drop landing task on both limbs. Three-dimensional kinematic (angular displacement) and sagittal plane kinetic (moment of force) data were acquired for the joints of the lower extremity, from 200 ms pre-initial contact (IC) to 200 ms post-IC. Individual joint stiffnesses and the peak magnitude of the vertical component of the ground reaction force (GRF) were also computed. LAS participants displayed increases in hip flexion and ankle inversion on their injured limb (P < 0.05); this coincided with a reduction in the net flexion-extension moment at the hip joint, with an increase in its stiffness (P < 0.05). There was no difference in the magnitude of the peak vertical GRF for either limb compared with controls. These results demonstrate that altered movement strategies persist in participants, 6 months following acute LAS, which may precipitate the onset of CAI.enThis is the pre-peer reviewed version of the following article: Doherty, Cailbhe; Bleakley, Chris; Hertel, Jay; Caulfield, Brian; Ryan, John; Delahunt , Eamonn (2014) "Scandinavian Journal of Medicine and Science in Sports" doi: 10.1111/sms.12390 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/sms.12390.Personal sensingAnkle jointKinematicsTask performance and analysisKineticsJournal Article25680681710.1111/sms.123902016-10-12https://creativecommons.org/licenses/by-nc-nd/3.0/ie/