title: Postural stability during the transition from double-leg stance to single-leg stance in anterior cruciate ligament injured subjects.
abstract: BACKGROUND
  An anterior cruciate ligament injury may lead to deteriorations in postural stability. The goal of this study was to evaluate postural stability during the transition from double-leg stance to single-leg stance of both legs in anterior cruciate ligament injured subjects and non-injured control subjects with a standardized methodology.
  
  
  METHODS
  Fifteen control subjects and 15 anterior cruciate ligament injured subjects (time after injury: mean (SD)=1.4 (0.7) months) participated in the study. Both groups were similar for age, gender, height, weight and body mass index. Spatiotemporal center of pressure outcomes of both legs of each subject were measured during the transition from double-leg stance to single-leg stance in eyes open and eyes closed conditions. Movement speed was standardized.
  
  
  RESULTS
  The center of pressure displacement after a new stability point was reached during the single-leg stance phase was significantly increased in the anterior cruciate ligament injured group compared to the control group in the eyes closed condition (P<.001). No significant different postural stability outcomes were found between both legs within both groups (P>.05). No significant differences were found during the transition itself (P>.05).
  
  
  CONCLUSIONS
  The anterior cruciate ligament injured group showed postural stability deficits during the single-leg stance phase compared to the non-injured control group in the eyes closed condition. Using the non-injured leg as a normal reference when evaluating postural stability of the injured leg may lead to misinterpretations, as no significant differences were found between the injured and non-injured leg of the anterior cruciate ligament injured group.
authors.affiliation: KU Leuven, Musculoskeletal Rehabilitation Research Group, Department of Rehabilitation Sciences, Faculty of Kinesiology and Rehabilitation Sciences, Tervuursevest 101 b1501, 3001 Heverlee, Belgium. Electronic address: bart.dingenen@faber.kuleuven.be.
authors.forename: Bart
authors.initials: B
authors.lastname: Dingenen
authors.affiliation: KU Leuven, Department of Electrical Engineering, Faculty of Engineering Technology Services, Andreas Vesaliusstraat 13, 3000 Leuven, Belgium; KU Leuven, Cardiovascular and Respiratory Rehabilitation Research Group, Department of Rehabilitation Sciences, Faculty of Kinesiology and Rehabilitation Sciences, Tervuursevest 101 b1501, 3001 Heverlee, Belgium. Electronic address: luc.janssens@kuleuven.be.
authors.forename: Luc
authors.initials: L
authors.lastname: Janssens
authors.affiliation: Department of Orthopedics, University Hospitals Leuven, Campus Pellenberg, Weligerveld 1, 3212 Pellenberg, Belgium. Electronic address: luyckx.thomas@gmail.com.
authors.forename: Thomas
authors.initials: T
authors.lastname: Luyckx
authors.affiliation: Department of Orthopedics, University Hospitals Leuven, Campus Pellenberg, Weligerveld 1, 3212 Pellenberg, Belgium; Department of Orthopedic Surgery, AZ Herentals Hospital, Nederrij 133, 2200 Herentals, Belgium. Electronic address: steven@kreutzfeldverein.be.
authors.forename: Steven
authors.initials: S
authors.lastname: Claes
authors.affiliation: Department of Orthopedics, University Hospitals Leuven, Campus Pellenberg, Weligerveld 1, 3212 Pellenberg, Belgium. Electronic address: johan.bellemans@skynet.be.
authors.forename: Johan
authors.initials: J
authors.lastname: Bellemans
authors.affiliation: KU Leuven, Musculoskeletal Rehabilitation Research Group, Department of Rehabilitation Sciences, Faculty of Kinesiology and Rehabilitation Sciences, Tervuursevest 101 b1501, 3001 Heverlee, Belgium. Electronic address: filip.staes@faber.kuleuven.be.
authors.forename: Filip F
authors.initials: FF
authors.lastname: Staes
mesh_terms: D016118:Anterior Cruciate Ligament / Q000503:physiopathology; D000070598:Anterior Cruciate Ligament Injuries; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000503:physiopathology*; D007866:Leg / Q000503:physiopathology*; D008297:Male; D009068:Movement; D004856:Postural Balance / Q000502:physiology*; D055815:Young Adult
keywords: Anterior cruciate ligament injury; Balance; Double-leg stance; Postural stability; Single-leg stance