title: Static rotational knee laxity in anterior cruciate ligament injuries.
abstract: OBJECTIVE
  The purpose was to provide an overview of the non-invasive devices measuring static rotational knee laxity in order to formulate recommendations for the future.
  
  
  RESULTS
  Early cadaver studies provided evidence that sectioning the anterior cruciate ligament (ACL) led to an increase of static rotational knee laxity of approximately 10-20% between full extension and 30° of knee flexion. Sections of the menisci or of the peripheral structures induced a much higher increase in rotation. This supported the hypothesis that static rotation measurements might be useful for the diagnosis of ACL or associated injuries. In vivo evaluations with measurement devices are relatively new. Several articles were published during the last decade with many different devices and important differences were seen in absolute rotational knee laxity between them. This was due to the varying precision of the devices, the variability in patient positioning, the different methods of measurement, examination protocols and data analysis. As a consequence, comparison of the available results should be performed with caution. Nevertheless, it has been established that rotational knee laxity was greater in females as compared to males and that the inter-subject variability was high. For this reason, it will probably be difficult to categorise injured patients preoperatively, and the interpretation of the results should probably be limited to side-to-side differences.
  
  
  CONCLUSIONS
  Future studies will show whether rotational laxity measurements alone will be sufficient to provide clinically relevant data or if they should be combined to static sagittal laxity measurements.
authors.affiliation: Sports Medicine Research Laboratory, Public Research Center for Health, 1460 Luxembourg, Luxembourg. caroline.mouton@crp-sante.lu
authors.forename: Caroline
authors.initials: C
authors.lastname: Mouton
authors.forename: Daniel
authors.initials: D
authors.lastname: Theisen
authors.forename: Dietrich
authors.initials: D
authors.lastname: Pape
authors.forename: Christian
authors.initials: C
authors.lastname: Nührenbörger
authors.forename: Romain
authors.initials: R
authors.lastname: Seil
mesh_terms: D016118:Anterior Cruciate Ligament / Q000601:surgery; D000070598:Anterior Cruciate Ligament Injuries; D059549:Anterior Cruciate Ligament Reconstruction / Q000379:methods; D001696:Biomechanical Phenomena; D002102:Cadaver; D015331:Cohort Studies; D004867:Equipment Design; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000175:diagnosis* / Q000209:etiology; D007718:Knee Injuries / Q000150:complications / Q000175:diagnosis / Q000601:surgery; D008297:Male; D008953:Models, Anatomic; D009983:Orthopedic Equipment; D016059:Range of Motion, Articular / Q000502:physiology*; D012016:Reference Values; D015203:Reproducibility of Results; D012399:Rotation