title: Lower extremity coordination and symmetry patterns during a drop vertical jump task following acute ankle sprain.
abstract: OBJECTIVE
  Evaluate the potentially adaptive movement patterns associated with acute lateral ankle sprain (LAS) using biomechanical analyzes.
  
  
  METHODS
  Thirty participants with acute LAS and nineteen controls performed a drop vertical jump (DVJ) task. 3D kinematic and sagittal plane kinetic profiles were plotted for the hip, knee and ankle joints of both limbs for the drop jump (phase 1) and drop landing (phase 2) phases of the DVJ. Inter-limb symmetry and the rate of force development (RFD) relative to bodyweight (BW) during both phases of the DVJ were also determined.
  
  
  RESULTS
  The LAS group displayed reduced ankle plantar-flexion on their injured limb during phase 2 of the DVJ, with greater associated inter-limb asymmetry for this movement (p<.05). The LAS group also displayed altered kinetic profiles, with increased inter-limb hip asymmetry for both phases of the DVJ (p<.05). This was associated with a decrease in the LAS participants' injured limb RFD during phase 2 of the DVJ when compared with that of controls (11.76±3.43BW/s vs 14.60±3.20BW/s; p=.01, η(2)=0.14).
  
  
  CONCLUSIONS
  Participants with LAS display potentially aberrant coordination strategies during a DVJ as evidenced by an increased dependence on the non-injured limb.
authors.affiliation: School of Public Health, Physiotherapy and Population Science, University College Dublin, Dublin, Ireland. Electronic address: cailbhe.doherty@ucdconnect.ie.
authors.forename: Cailbhe
authors.initials: C
authors.lastname: Doherty
authors.affiliation: Sport and Exercise Sciences Research Institute, Ulster Sports Academy, University of Ulster, Newtownabbey, Co. Antrim, Northern Ireland, United Kingdom.
authors.forename: Chris
authors.initials: C
authors.lastname: Bleakley
authors.affiliation: Department of Kinesiology, University of Virginia, Charlottesville, VA, United States.
authors.forename: Jay
authors.initials: J
authors.lastname: Hertel
authors.affiliation: School of Public Health, Physiotherapy and Population Science, University College Dublin, Dublin, Ireland.
authors.forename: Kevin
authors.initials: K
authors.lastname: Sweeney
authors.affiliation: School of Public Health, Physiotherapy and Population Science, University College Dublin, Dublin, Ireland.
authors.forename: Brian
authors.initials: B
authors.lastname: Caulfield
authors.affiliation: St. Vincent's University Hospital, Dublin, Ireland.
authors.forename: John
authors.initials: J
authors.lastname: Ryan
authors.affiliation: School of Public Health, Physiotherapy and Population Science, University College Dublin, Dublin, Ireland; Institute for Sport and Health, University College Dublin, Dublin, Ireland.
authors.forename: Eamonn
authors.initials: E
authors.lastname: Delahunt
mesh_terms: D000328:Adult; D000842:Ankle / Q000503:physiopathology*; D016512:Ankle Injuries / Q000503:physiopathology*; D001696:Biomechanical Phenomena; D001835:Body Weight; D016022:Case-Control Studies; D005260:Female; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D007593:Joint Instability; D007719:Knee Joint / Q000502:physiology; D035002:Lower Extremity / Q000502:physiology; D008297:Male; D009068:Movement; D055815:Young Adult
keywords: Ankle joint; Biomechanics; Kinematics; Kinetics; Task Performance and Analysis