title: Center of pressure during stance and gait in subjects with or without persistent complaints after a lateral ankle sprain.
abstract: To investigate differences in the center of pressure (COP) during gait and single leg stance between subjects with persistent complaints (PC) and without persistent complaints (NPC) after a lateral ankle sprain.
  
  
  
  44 patients who consulted the general practitioner, 6-12 months prior to inclusion, with a lateral ankle sprain were included for the current study purpose. Using a 7-point Likert scale patients were divided into the PC or NPC group. All subjects filled out an online questionnaire, walked along a walkway and performed a single leg stance, both on the RSscan. Primary outcomes included the COP displacement, range and percentage used in mediolateral and anterioposterior direction.
  
  
  
  There was a trend (p<0.05) towards a more medially COP trajectory during walking at 34-46% and 83-96% and more anteriorly at 21-31% and 91-100% of the stance phase in the PC group compared to NPC group. Additionally, the COP was more laterally located in the sprained leg compared to the non-sprained leg in the PC group in the loading response phase (p<0.05). An interaction was found for the percentage of anterior-posterior range used in single leg stance without vision.
  
  
  
  The COP trajectory discriminates between patients with PC and NPC. This indicates that roll off during gait might play an important role in the recovery of patients after a lateral ankle sprain and could be used to monitor treatment.
authors.affiliation: Department of General Practice, Erasmus MC University Medical Center Rotterdam, PO Box 2040 3000 CA Rotterdam, The Netherlands.
authors.forename: Wouter
authors.initials: W
authors.lastname: Kros
authors.affiliation: Department for Scientific Research, Sint Maartenskliniek, PO Box 9011 6500 GM Nijmegen, The Netherlands.
authors.forename: Noël L W
authors.initials: NLW
authors.lastname: Keijsers
authors.affiliation: Department of General Practice, Erasmus MC University Medical Center Rotterdam, PO Box 2040 3000 CA Rotterdam, The Netherlands.
authors.forename: John M
authors.initials: JM
authors.lastname: van Ochten
authors.affiliation: Department of General Practice, Erasmus MC University Medical Center Rotterdam, PO Box 2040 3000 CA Rotterdam, The Netherlands.
authors.forename: Sita M A
authors.initials: SMA
authors.lastname: Bierma-Zeinstra
authors.affiliation: Department of General Practice, Erasmus MC University Medical Center Rotterdam, PO Box 2040 3000 CA Rotterdam, The Netherlands. Electronic address: m.vanmiddelkoop@erasmusmc.nl.
authors.forename: Marienke
authors.initials: M
authors.lastname: van Middelkoop
mesh_terms: D000328:Adult; D016512:Ankle Injuries / Q000503:physiopathology*; D016022:Case-Control Studies; D005260:Female; D005684:Gait; D006801:Humans; D008297:Male; D004856:Postural Balance; D011312:Pressure; D016138:Walking
keywords: Ankle; Balance; Gait; Persistent complaints; Sprain