title: Lower Limb Interjoint Postural Coordination One Year after First-Time Lateral Ankle Sprain.
abstract: BACKGROUND
  Longitudinal analyses of participants with a history of lateral ankle sprain are lacking. This investigation combined measures of lower limb interjoint coordination and stabilometry to evaluate static unipedal stance with the eyes open (condition 1) and closed (condition 2) in a group of participants with chronic ankle instability (CAI) compared to lateral ankle sprain "copers" (both recruited 12 months after sustaining an acute first-time lateral ankle sprain) and a group of noninjured controls.
  
  
  METHODS
  Twenty-eight participants with CAI, 42 lateral ankle sprain "copers," and 20 noninjured controls completed three 20-s single-limb stance trials in conditions 1 and 2. An adjusted coefficient of multiple determination statistic was used to compare stance limb three-dimensional kinematic data for similarity to establish patterns of interjoint coordination. The fractal dimension of the stance limb center of pressure path was also calculated.
  
  
  RESULTS
  Between-group analyses revealed that participants with CAI displayed notable increases in ankle-hip linked coordination compared with both lateral ankle sprain "copers" (-0.52 (1.05) vs 0.28 (0.9), P = 0.007) and controls (-0.52 (1.05) vs 0.63 (0.64), P = 0.006) in condition 1 and compared with controls only (0.62 (1.92) vs 0.1 (1.0) P = 0.002) in condition 2. Participants with CAI also exhibited a decrease in the fractal dimension of the center-of-pressure path during condition 2 compared with both controls and lateral ankle sprain "copers."
  
  
  CONCLUSIONS
  Participants with CAI present with a hip-dominant strategy of eyes-open and eyes-closed static unipedal stance. This coincided with reduced complexity of the stance limb center of pressure path in the eyes-closed condition.
authors.affiliation: 1School of Public Health, Physiotherapy and Population Science, University College Dublin, Dublin, IRELAND; 2Sport and Exercise Sciences Research Institute, Ulster Sports Academy, University of Ulster, Newtownabbey, County Antrim, UNITED KINGDOM; 3Department of Kinesiology, University of Virginia, Charlottesville, VA; 4Emergency Department, St. Vincent's University Hospital, Dublin, IRELAND; 5Insight Centre for Data Analytics, University College Dublin, Dublin, IRELAND; and 6Institute for Sport and Health, University College Dublin, Dublin, IRELAND.
authors.forename: Cailbhe
authors.initials: C
authors.lastname: Doherty
authors.forename: Chris
authors.initials: C
authors.lastname: Bleakley
authors.forename: Jay
authors.initials: J
authors.lastname: Hertel
authors.forename: Brian
authors.initials: B
authors.lastname: Caulfield
authors.forename: John
authors.initials: J
authors.lastname: Ryan
authors.forename: Kevin
authors.initials: K
authors.lastname: Sweeney
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Patterson
authors.forename: Eamonn
authors.initials: E
authors.lastname: Delahunt
mesh_terms: D000842:Ankle / Q000503:physiopathology; D016512:Ankle Injuries / Q000503:physiopathology*; D001696:Biomechanical Phenomena; D005260:Female; D005500:Follow-Up Studies; D006615:Hip / Q000503:physiopathology; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology; D007700:Kinetics; D035002:Lower Extremity / Q000503:physiopathology*; D008297:Male; D004856:Postural Balance / Q000502:physiology*; D013180:Sprains and Strains / Q000503:physiopathology*; D055815:Young Adult