title: A diagonal landing task to assess dynamic postural stability in ACL reconstructed females.
abstract: BACKGROUND
  Previous research has used time to stabilization (TTS) from forward landing tasks to assess dynamic postural stability in ACL reconstructed (ACLR) athletes in order to identify impaired sensorimotor control and mechanical stability. This may not be an appropriate test due to the fact that research has suggested that ACL injury has a multi-planar mechanism of injury. The purpose of the present study was to compare TTS values from a forward land and a diagonal land to determine if diagonal landing TTS values are more sensitive to dynamic postural stability deficits in female ACLR athletes.
  
  
  METHODS
  A group of ACL reconstructed female athletes and a group of female control athletes performed three forward lands and three diagonal lands onto a force-plate and remained still on one foot for 15s. TTS was calculated for the anterior-posterior and medial-lateral ground reaction forces as well as the resultant vector of both forces.
  
  
  RESULTS
  All three TTS values were significantly increased in the ACLR group from the control group for the diagonal landing task. There was no difference in TTS values between the groups for the forward landing task.
  
  
  CONCLUSIONS
  TTS values from a diagonal landing are more sensitive at detecting impaired dynamic postural stability in a group of female ACLR athletes compared to TTS values from a forward land.
  
  
  METHODS
  III - Casecontrolled study.
authors: School of Public Health, Physiotherapy and Population Science, University College Dublin, Health Sciences Centre, Belfield, Dublin 4, Ireland; Clarity Centre for Sensor Web Technologies, University College Dublin, Ireland. Electronic address: matt.patterson@ucd.ie.
authors: Matthew R
authors: MR
authors: Patterson
authors: Eamonn
authors: E
authors: Delahunt
mesh_terms: D000070598:Anterior Cruciate Ligament Injuries; D059549:Anterior Cruciate Ligament Reconstruction / Q000009:adverse effects / Q000379:methods*; D056352:Athletes / Q000706:statistics & numerical data; D001265:Athletic Injuries / Q000453:epidemiology / Q000517:prevention & control; D001696:Biomechanical Phenomena; D005080:Exercise Test / Q000379:methods; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000517:prevention & control; D007718:Knee Injuries / Q000175:diagnosis / Q000601:surgery; D004856:Postural Balance / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D011930:Reaction Time; D012494:Sampling Studies; D013177:Sports; D013647:Task Performance and Analysis; D055815:Young Adult
keywords: Dynamic balance; Ground reaction force; Landing; Postural control; Time to stabilization