Effects of external ankle support on ankle kinematics and kinetics when performing a drop-cut maneuver

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  • March 20, 2019
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  • Barr, Thomas B.
    • Affiliation: College of Arts and Sciences, Department of Exercise and Sport Science
Abstract
  • Objective: To compare the effect of clinically used external ankle support (EAS) conditions on ankle kinematics and kinetics between those with stable ankles and those with unstable ankles. Design: A repeated-measures, counter-balanced research design was used to compare a stable group and an unstable group under three conditions of EAS (no support, athletic tape, and athletic brace). Subjects: Twelve subjects with stable ankles and twelve subjects with a history of unstable ankles volunteered to participate. Measurements: Sagittal plane ankle angles at initial contact, frontal plane ankle angles at initial contact, peak vertical ground reaction force, and time to peak vertical ground reaction force were the measured while completing a drop-cut maneuver. A mixed model ANOVA was used for statistical analyses for each dependent variable. Post-hoc testing was done with Tukey's HSD. Results: A significant main effect for EAS was found for sagittal plane ankle angle at initial contact (F2,44=4.278, P=0.020). Pairwise comparisons revealed that the athletic tape condition landed in less plantar flexion than did athletic brace. There was also a significant Ankle Stability x EAS interaction effect (F2,44=3.273, P=0.047). Pairwise comparisons revealed that the unstable-athletic tape condition landed in less plantar flexion than did the unstable-athletic brace condition. There were no other significant main or interaction effects. Conclusions: While athletic tape did limit plantar-flexion better then athletic brace, the use of EAS cannot be supported by the current project as athletic tape and athletic brace did not limit plantar flexion when compared to no support. Unstable ankles did not alter kinematics when compared to stable ankles. EAS use did not have a significant impact on the kinetics of the drop-cut maneuver. Clinicians are encouraged to consult the larger body of research related to ankle instability and EAS when making clinical decisions.
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  • "... in partial fulfillment of the requirements for the degree of Master of Arts in the Department of Exercise & Sport Sciences in the College of Arts & Sciences."
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  • Zinder, Steven
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  • Chapel Hill, NC
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  • Open access
Date uploaded
  • March 18, 2013

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