VALIDATION OF A TWO-DIMENSIONAL MOTION ANALYSIS TECHNIQUE FOR QUANTIFYING DYNAMIC KNEE VALGUS DURING A DROP LANDING BY COMPARISONS TO DATA FROM THREE-DIMENSIONAL ANALYSIS

KAGAYA YOSHINORI, KAWASAKI WATARU, FUJII YASUNARI, NISHIZONO HIDETSUGU

doi:10.7600/jspfsm.59.407

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二次元画像で算出したKnee in distanceおよびHip out distanceの妥当性～片脚着地動作における三次元動作解析との比較から～
2ジゲンガゾウデサンシュツシタ Knee in distance オヨビ Hip out distance ノダトウセイカタアシチャクチドウサニオケル 3ジゲンドウサカイセキトノヒカクカラ

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Dynamic knee valgus is considered a risk factor of non-contact anterior cruciate ligament (ACL) injury. To identify athletes at a higher risk, we developed a two-dimensional (2D) video-based screening test that determines hip abductor function as well as dynamic hindfoot and knee valgus. The purpose of this study was to validate the accuracy of the indices for dynamic knee valgus derived knee-in distance (KID) and hip-out distance (HOD) from the 2D-video.<br>Twenty healthy university students agreed to participate in this study. Subjects were asked to step off a 30-cm box and land on one leg. This procedure was recorded simultaneously using a 2D video camera in the frontal plane and the Vicon motion capture system. Pearson's correlations examined associations between KID, KID normalized by height (KID/H), HOD, as well as HOD normalized by height (HOD/H) and 3D-valgus (knee valgus) or 3D-IR (tibial internal rotation).<br>Significant correlations were found between the KID and 3D-valgus (r=0.72, p<0.01) and KID/H and 3D-valgus (r=0.73, p<0.01). Associations were not significant between KID and 3D-IR (r=0.08) and between KID/H and 3D-IR (r=0.03). A positive moderate correlation between HOD and 3D-valgus (r=0.46, p<0.05) and HOD/H and 3D-valgus (r=0.50, p<0.05), as well as a negative moderate correlations between HOD and 3D-IR (r=-0.52, p<0.05) and between HOD/H and 3D-IR (r=-0.51, p<0.05) were also observed.<br>We conclude that KID is a reliable alternative for the 3D-valgus and the HOD is for the 3D-valgus and tibial external rotation.

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Japanese Journal of Physical Fitness and Sports Medicine

Japanese Journal of Physical Fitness and Sports Medicine 59 (4), 407-414, 2010

The Japanese Society of Physical Fitness and Sports Medicine

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