title: Test-retest reliability of biodex system 4 pro for isometric ankle-eversion and -inversion measurement.
abstract: BACKGROUND
  The lack of knowledge about isometric ankle testing indicates the need for research in this area.
  
  
  OBJECTIVE
  to assess test-retest reliability and to determine the optimal position for isometric ankle-eversion and -inversion testing.
  
  
  METHODS
  Test-retest reliability study. Isometric ankle eversion and inversion were assessed in 3 different dynamometer foot-plate positions: 0°, 7°, and 14° of inversion. Two maximal repetitions were performed at each angle. Both limbs were tested (40 ankles in total). The test was performed 2 times with a period of 7 d between the tests.
  
  
  METHODS
  University hospital.
  
  
  METHODS
  The study was carried out on 20 healthy athletes with no history of ankle sprains.
  
  
  METHODS
  Reliability was assessed using intraclass correlation coefficient (ICC2,1); minimal detectable change (MDC) was calculated using a 95% confidence interval. Paired t test was used to measure statistically significant changes, and P <.05 was considered statistically significant.
  
  
  RESULTS
  Eversion and inversion peak torques showed high ICCs in all 3 angles (ICC values .87-.96, MDC values 3.09-6.81 Nm). Eversion peak torque was the smallest when testing at the 0° angle and gradually increased, reaching maximum values at 14° angle. The increase of eversion peak torque was statistically significant at 7 ° and 14° of inversion. Inversion peak torque showed an opposite pattern-it was the smallest when measured at the 14° angle and increased at the other 2 angles; statistically significant changes were seen only between measures taken at 0° and 14°.
  
  
  CONCLUSIONS
  Isometric eversion and inversion testing using the Biodex 4 Pro system is a reliable method. The authors suggest that the angle of 7° of inversion is the best for isometric eversion and inversion testing.
authors.affiliation: Lithuanian University of Health Sciences, Kaunas, Lithuania.
authors.forename: Gediminas
authors.initials: G
authors.lastname: Tankevicius
authors.forename: Doanata
authors.initials: D
authors.lastname: Lankaite
authors.forename: Aleksandras
authors.initials: A
authors.lastname: Krisciunas
mesh_terms: D000293:Adolescent; D000328:Adult; D000843:Ankle Joint / Q000502:physiology*; D056352:Athletes; D006785:Hospitals, University; D006801:Humans; D053581:Muscle Strength Dynamometer; D052580:Muscle Stretching Exercises; D018482:Muscle, Skeletal / Q000502:physiology*; D016059:Range of Motion, Articular; D015203:Reproducibility of Results; D055815:Young Adult