title: Reliability of 3-Dimensional Measures of Single-Leg Cross Drop Landing Across 3 Different Institutions: Implications for Multicenter Biomechanical and Epidemiological Research on ACL Injury Prevention.
abstract: BACKGROUND
  Anterior cruciate ligament (ACL) injuries are physically and financially devastating but affect a relatively small percentage of the population. Prospective identification of risk factors for ACL injury necessitates a large sample size; therefore, study of this injury would benefit from a multicenter approach.
  
  
  OBJECTIVE
  To determine the reliability of kinematic and kinetic measures of a single-leg cross drop task across 3 institutions.
  
  
  METHODS
  Controlled laboratory study.
  
  
  METHODS
  Twenty-five female high school volleyball players participated in this study. Three-dimensional motion data of each participant performing the single-leg cross drop were collected at 3 institutions over a period of 4 weeks. Coefficients of multiple correlation were calculated to assess the reliability of kinematic and kinetic measures during the landing phase of the movement.
  
  
  RESULTS
  Between-centers reliability for kinematic waveforms in the frontal and sagittal planes was good, but moderate in the transverse plane. Between-centers reliability for kinetic waveforms was good in the sagittal, frontal, and transverse planes.
  
  
  CONCLUSIONS
  Based on these findings, the single-leg cross drop task has moderate to good reliability of kinematic and kinetic measures across institutions after implementation of a standardized testing protocol.
  
  
  CONCLUSIONS
  Multicenter collaborations can increase study numbers and generalize results, which is beneficial for studies of relatively rare phenomena, such as ACL injury. An important step is to determine the reliability of risk assessments across institutions before a multicenter collaboration can be initiated.
authors.affiliation: Cincinnati Children's Hospital Medical Center, Sports Medicine Biodynamics Center and Human Performance Laboratory, Cincinnati, Ohio, USA.
authors.forename: Christopher A
authors.initials: CA
authors.lastname: DiCesare
authors.affiliation: Cincinnati Children's Hospital Medical Center, Sports Medicine Biodynamics Center and Human Performance Laboratory, Cincinnati, Ohio, USA.; Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA.
authors.forename: Nathaniel A
authors.initials: NA
authors.lastname: Bates
authors.affiliation: Cincinnati Children's Hospital Medical Center, Sports Medicine Biodynamics Center and Human Performance Laboratory, Cincinnati, Ohio, USA.
authors.forename: Kim D
authors.initials: KD
authors.lastname: Barber Foss
authors.affiliation: Cincinnati Children's Hospital Medical Center, Sports Medicine Biodynamics Center and Human Performance Laboratory, Cincinnati, Ohio, USA.
authors.forename: Staci M
authors.initials: SM
authors.lastname: Thomas
authors.affiliation: Cincinnati Children's Hospital Medical Center, Sports Medicine Biodynamics Center and Human Performance Laboratory, Cincinnati, Ohio, USA.; Sports Medicine, The Sports Health and Performance Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA.
authors.forename: Samuel C
authors.initials: SC
authors.lastname: Wordeman
authors.affiliation: Cincinnati Children's Hospital Medical Center, Sports Medicine Biodynamics Center and Human Performance Laboratory, Cincinnati, Ohio, USA.; Division of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, Kentucky, USA.; The Micheli Center for Sports Injury Prevention, Waltham, Massachusetts, USA.; Division of Sports Medicine, Department of Orthopaedics, Boston Children's Hospital, Boston, Massachusetts, USA.
authors.forename: Dai
authors.initials: D
authors.lastname: Sugimoto
authors.affiliation: Sports Medicine, The Sports Health and Performance Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA.; The Micheli Center for Sports Injury Prevention, Waltham, Massachusetts, USA.
authors.forename: Benjamin D
authors.initials: BD
authors.lastname: Roewer
authors.affiliation: Division of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, Kentucky, USA.; Department of Exercise and Sport Sciences, Ithaca College, Ithaca, New York, USA.
authors.forename: Jennifer M
authors.initials: JM
authors.lastname: Medina McKeon
authors.affiliation: Sports Medicine, The Sports Health and Performance Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA.; Department of Orthopaedics and the School of Health and Rehabilitation Sciences, The Ohio State University, Columbus, Ohio, USA.
authors.forename: Stephanie
authors.initials: S
authors.lastname: Di Stasi
authors.affiliation: Division of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, Kentucky, USA.
authors.forename: Brian W
authors.initials: BW
authors.lastname: Noehren
authors.affiliation: Department of Physical Therapy, High Point University, High Point, North Carolina, USA.
authors.forename: Kevin R
authors.initials: KR
authors.lastname: Ford
authors.affiliation: Cincinnati Children's Hospital Medical Center, Sports Medicine Biodynamics Center and Human Performance Laboratory, Cincinnati, Ohio, USA.; Departments of Pediatrics and Orthopaedic Surgery, College of Medicine, University of Cincinnati, Cincinnati, Ohio, USA.
authors.forename: Adam W
authors.initials: AW
authors.lastname: Kiefer
authors.affiliation: Cincinnati Children's Hospital Medical Center, Sports Medicine Biodynamics Center and Human Performance Laboratory, Cincinnati, Ohio, USA.
authors.forename: Timothy E
authors.initials: TE
authors.lastname: Hewett
authors.affiliation: Cincinnati Children's Hospital Medical Center, Sports Medicine Biodynamics Center and Human Performance Laboratory, Cincinnati, Ohio, USA.
authors.forename: Gregory D
authors.initials: GD
authors.lastname: Myer
keywords: anterior cruciate ligament; biomechanics; epidemiology; multicenter