Cargando…

Sex Differences in Knee Flexion Angle During a Rapid Change of Direction While Running

BACKGROUND: Females experience greater overall rates of athletic anterior cruciate ligament (ACL) injury than males. The specific mechanisms of the predisposition remain unclear. HYPOTHESIS: Modeling of knee kinematics has shown that the more extended the knee joint, the greater the strain on the AC...

Descripción completa

Detalles Bibliográficos
Autores principales: Sheu, Christopher L., Gray, Aaron M., Brown, David, Smith, Brian A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2015
Materias:
25
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4710122/
https://www.ncbi.nlm.nih.gov/pubmed/26779551
http://dx.doi.org/10.1177/2325967115617932
_version_ 1782409775594602496
author Sheu, Christopher L.
Gray, Aaron M.
Brown, David
Smith, Brian A.
author_facet Sheu, Christopher L.
Gray, Aaron M.
Brown, David
Smith, Brian A.
author_sort Sheu, Christopher L.
collection PubMed
description BACKGROUND: Females experience greater overall rates of athletic anterior cruciate ligament (ACL) injury than males. The specific mechanisms of the predisposition remain unclear. HYPOTHESIS: Modeling of knee kinematics has shown that the more extended the knee joint, the greater the strain on the ACL. The authors hypothesized that female athletes would have a lesser degree of knee flexion than male athletes at initial ground contact while performing change-of-direction cutting maneuvers. STUDY DESIGN: Controlled laboratory study. METHODS: Twenty female and 20 male high school soccer athletes with at least 1 year of experience were recruited for the study. Athletes were excluded if they had a history of any major lower limb injury or current knee pain causing a reduction in training and/or competition. Reflective markers were attached at the greater trochanter of the femur, the lateral epicondyle of the knee, and the lateral malleolus of the ankle to enable motion capture. Each athlete performed 6 change-of-direction maneuvers in random order in front of 2 cameras. Multiple regression analysis was used to determine differences between the sexes from the motion data captured; P < .05 defined significance. RESULTS: Statistically significant differences existed in knee flexion angles between male and female participants at the 90° and 135° cutting angles. At 90°, males and females showed initial contact knee flexion angles (mean ± SD) of 39.0° ± 6.8° and 29.3° ± 6.2°, respectively (P < .0001), and mean maximum flexion angles of 56.4° ± 6.9° and 49.7° ± 7.0°, respectively (P = .0036). At 135°, males and females showed mean initial contact knee flexion angles of 36.8° ± 7.9° and 29.7° ± 7.8°, respectively (P = .0053), and mean maximum flexion angles of 60.7° ± 8.1° and 51.6° ± 9.4°, respectively (P = .0017). CONCLUSION: The research conducted is intended to foster an awareness of injury disposition in female athletes and guide future endeavors to develop, test, and implement a proactive approach in lowering female noncontact athletic ACL injury rates. This project adds to the literature as wider side-cut maneuvers (≥90°) were studied, as compared with previous studies using small side-cut angles (<90°), offering a model for alternative sports actions.
format Online
Article
Text
id pubmed-4710122
institution National Center for Biotechnology Information
language English
publishDate 2015
publisher SAGE Publications
record_format MEDLINE/PubMed
spelling pubmed-47101222016-01-15 Sex Differences in Knee Flexion Angle During a Rapid Change of Direction While Running Sheu, Christopher L. Gray, Aaron M. Brown, David Smith, Brian A. Orthop J Sports Med 25 BACKGROUND: Females experience greater overall rates of athletic anterior cruciate ligament (ACL) injury than males. The specific mechanisms of the predisposition remain unclear. HYPOTHESIS: Modeling of knee kinematics has shown that the more extended the knee joint, the greater the strain on the ACL. The authors hypothesized that female athletes would have a lesser degree of knee flexion than male athletes at initial ground contact while performing change-of-direction cutting maneuvers. STUDY DESIGN: Controlled laboratory study. METHODS: Twenty female and 20 male high school soccer athletes with at least 1 year of experience were recruited for the study. Athletes were excluded if they had a history of any major lower limb injury or current knee pain causing a reduction in training and/or competition. Reflective markers were attached at the greater trochanter of the femur, the lateral epicondyle of the knee, and the lateral malleolus of the ankle to enable motion capture. Each athlete performed 6 change-of-direction maneuvers in random order in front of 2 cameras. Multiple regression analysis was used to determine differences between the sexes from the motion data captured; P < .05 defined significance. RESULTS: Statistically significant differences existed in knee flexion angles between male and female participants at the 90° and 135° cutting angles. At 90°, males and females showed initial contact knee flexion angles (mean ± SD) of 39.0° ± 6.8° and 29.3° ± 6.2°, respectively (P < .0001), and mean maximum flexion angles of 56.4° ± 6.9° and 49.7° ± 7.0°, respectively (P = .0036). At 135°, males and females showed mean initial contact knee flexion angles of 36.8° ± 7.9° and 29.7° ± 7.8°, respectively (P = .0053), and mean maximum flexion angles of 60.7° ± 8.1° and 51.6° ± 9.4°, respectively (P = .0017). CONCLUSION: The research conducted is intended to foster an awareness of injury disposition in female athletes and guide future endeavors to develop, test, and implement a proactive approach in lowering female noncontact athletic ACL injury rates. This project adds to the literature as wider side-cut maneuvers (≥90°) were studied, as compared with previous studies using small side-cut angles (<90°), offering a model for alternative sports actions. SAGE Publications 2015-12-15 /pmc/articles/PMC4710122/ /pubmed/26779551 http://dx.doi.org/10.1177/2325967115617932 Text en © The Author(s) 2015 http://creativecommons.org/licenses/by-nc-nd/3.0/ This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License (http://www.creativecommons.org/licenses/by-nc-nd/3.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).
spellingShingle 25
Sheu, Christopher L.
Gray, Aaron M.
Brown, David
Smith, Brian A.
Sex Differences in Knee Flexion Angle During a Rapid Change of Direction While Running
title Sex Differences in Knee Flexion Angle During a Rapid Change of Direction While Running
title_full Sex Differences in Knee Flexion Angle During a Rapid Change of Direction While Running
title_fullStr Sex Differences in Knee Flexion Angle During a Rapid Change of Direction While Running
title_full_unstemmed Sex Differences in Knee Flexion Angle During a Rapid Change of Direction While Running
title_short Sex Differences in Knee Flexion Angle During a Rapid Change of Direction While Running
title_sort sex differences in knee flexion angle during a rapid change of direction while running
topic 25
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4710122/
https://www.ncbi.nlm.nih.gov/pubmed/26779551
http://dx.doi.org/10.1177/2325967115617932
work_keys_str_mv AT sheuchristopherl sexdifferencesinkneeflexionangleduringarapidchangeofdirectionwhilerunning
AT grayaaronm sexdifferencesinkneeflexionangleduringarapidchangeofdirectionwhilerunning
AT browndavid sexdifferencesinkneeflexionangleduringarapidchangeofdirectionwhilerunning
AT smithbriana sexdifferencesinkneeflexionangleduringarapidchangeofdirectionwhilerunning