title: Coordination and Symmetry Patterns During the Drop Vertical Jump in People With Chronic Ankle Instability and Lateral Ankle Sprain Copers.
abstract: The drop vertical jump (DVJ) task has previously been used to identify movement patterns associated with a number of injury types. However, no current research exists evaluating people with chronic ankle instability (CAI) compared with people coping with lateral ankle sprain (LAS) (referred to as "LAS copers") during this task.
  
  
  
  The aim of this study was to identify the coping movement and motor control patterns of LAS copers in comparison with individuals with CAI during the DVJ task.
  
  
  
  This was a case-control study.
  
  
  
  Seventy individuals were recruited at convenience within 2-weeks of sustaining a first-time acute LAS injury. One year following recruitment, these individuals were stratified into 2 groups: 28 with CAI and 42 LAS copers. They attended the testing laboratory to complete a DVJ task. Three-dimensional kinematic and sagittal-plane kinetic profiles were plotted for the lower extremity joints of both limbs for the drop jump phase (phase 1) and drop landing phase (phase 2) of the DVJ. The rate of impact modulation relative to body weight during both phases of the DVJ also was determined.
  
  
  
  Compared with LAS copers, participants with CAI displayed significant increases in hip flexion on their "involved" limb during phase 1 of the DVJ (23° vs 18°) and bilaterally during phase 2 (15° vs 10°). These movement patterns coincided with altered moment-of-force patterns at the hip on the "uninvolved" limb.
  
  
  
  It is unknown whether these movement and motor control patterns preceded or occurred as a result of the initial LAS injury.
  
  
  
  Participants with CAI displayed hip-centered changes in movement and motor control patterns during a DVJ task compared with LAS copers. The findings of this study may give an indication of the coping mechanism underlying outcome following initial LAS injury.
authors.affiliation: C. Doherty, BSc, PhD, A101, School of Public Health, Physiotherapy and Sports Science, University College Dublin, Health Sciences Centre, Belfield, Dublin, Ireland. cailbhe.doherty@ucdconnect.ie.
authors.forename: Cailbhe
authors.initials: C
authors.lastname: Doherty
authors.affiliation: C. Bleakley, BSc, PhD, Sport and Exercise Sciences Research Institute, Ulster Sports Academy, University of Ulster, Newtownabbey, County Antrim, Northern Ireland.
authors.forename: Chris
authors.initials: C
authors.lastname: Bleakley
authors.affiliation: J. Hertel, PhD, ATC, Department of Kinesiology, University of Virginia, Charlottesville, Virginia.
authors.forename: Jay
authors.initials: J
authors.lastname: Hertel
authors.affiliation: B. Caulfield, BSc, PhD, School of Public Health, Physiotherapy and Sports Science, University College Dublin, Health Sciences Centre.
authors.forename: Brian
authors.initials: B
authors.lastname: Caulfield
authors.affiliation: J. Ryan, DCH, St Vincent's University Hospital, Dublin, Ireland.
authors.forename: John
authors.initials: J
authors.lastname: Ryan
authors.affiliation: K. Sweeney, BSc, PhD, Insight Centre for Data Analytics, University College Dublin.
authors.forename: Kevin
authors.initials: K
authors.lastname: Sweeney
authors.affiliation: M.R. Patterson, BSc, PhD, Insight Centre for Data Analytics, University College Dublin.
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Patterson
authors.affiliation: E. Delahunt, BSc, PhD, School of Public Health, Physiotherapy and Sports Science, University College Dublin, Health Sciences Centre, and Institute for Sport and Health, University College Dublin.
authors.forename: Eamonn
authors.initials: E
authors.lastname: Delahunt
mesh_terms: D000222:Adaptation, Physiological; D016512:Ankle Injuries / Q000503:physiopathology*; D000843:Ankle Joint / Q000503:physiopathology*; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D005260:Female; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology*; D008297:Male; D009048:Motor Skills; D009068:Movement / Q000502:physiology*; D013180:Sprains and Strains / Q000503:physiopathology*; D055815:Young Adult