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Document Title: Yu-AJSM-Jul04.shtml (version without comments: Yu-AJSM-Jul04-no-comments.shtml)
Article Title: Immediate Effects of a Knee Brace With a Constraint to Knee Extension on Knee Kinematics and Ground Reaction Forces in a Stop-Jump Task
Authors: Bing Yu, PhD, Daniel Herman, Jennifer Preston, MS, William Lu, PhD, Donald T. Kirkendall, PhD and William E. Garrett, PhD.
Publication: American Journal of Sports Medicine, Baltimore, Maryland
Date: July 2004
Volume 32, pages 1136-1143
Keywords: functional knee bracing, brace, spring-loading, extension restriction, anterior cruciate ligament (ACL), injury prevention, jump landing, biomechanics.
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ABSTRACT
Background: A small knee flexion angle in landing tasks was identified as a possible risk factor for noncontact anterior cruciate ligament injuries that are common in sports.
Hypothesis: A specially designed knee brace with a constraint to knee extension would significantly increase the knee flexion angle at the landing of athletic tasks preceded with horizontal movement components, such as stop-jump tasks.
Study Design: Repeated measure design for brace effects.
Methods: Three-dimensional videographic and force plate data were collected for 10 male and 10 female recreational athletes performing a stop-jump task with and without the specially designed brace. Knee flexion angle at landing, maximum knee flexion angle, and peak ground reaction forces during the stance phase of the stop-jump task were determined for each subject with and without the knee brace.
Results: The knee brace decreased the knee flexion angle at the landing by 5° for both genders but did not significantly affect the peak ground reaction forces during the landing.
Conclusions: The specially designed knee brace may be a useful device in the prevention and rehabilitation of noncontact anterior cruciate ligament injuries in sports.
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