INFLUENCE OF BODY MOVEMENT ON ANTERIOR TRANSLATION OF THE TIBIA WITH CONSTANT KNEE FLEXION ANGLE

• Published in: Journal of The Showa Medical Association Vol. 54; no. 3; pp. 176 - 184
• Main Author: FUKUI Tsutomu
• Format: Journal Article
• Language: English
• Published: 昭和大学学士会 1994; The Showa University Society
• Subjects: anterior cruciate ligament; anterior translation of tibia; center of gravity; center of pressure; knee joint moment; 脛骨前方移動; 膝前十字靱帯; 膝関節モーメント; 足圧中心; 身体重心
• ISSN: 0037-4342; 2185-0976
• DOI: 10.14930/jsma1939.54.176

Details of the mechanism of anterior cruciate ligament injury are still indefinite. The purpose of this study was examine, by motion analysis, factors that will enlarge anterior translation of the tibia relative to the femur. Subjects were 36 persons total [ACL reconstruction 17, ACL insufficiency 4, normal 15] . After a subject's knee joint had been fixed at 30 degrees flexion by a brace, the subject was asked to sway the body forward and backward. This movement was measured by three dimensional motion analysis, a force plate, electromyogram, and a knee motion analyzer. Anterior-posterior translation of the tibia was significantly correlated to movement of the center of gravity, center of pressure, and knee joint moment. Anterior translation of the tibia, corresponding to backward movement of the center of gravity and center of pressure, increased knee extension moment. Because knee moment is the product of muscular strength and moment arm, the knee extension moment, influenced by posture is the main factor in moving the tibia anteriorly. 脛骨の前後移動と身体運動の関係を膝前十字靱帯外傷群 (以下ACL外傷群: 膝前十字靱帯不全者, 再建者, 顆間隆起骨析整復者) 21名, コントロール群 (健常者) 15名, 計36名について3次元動作解析を行った.膝関節30°屈曲位固定下に身体を前後に傾ける動作中の, 大腿骨に対する脛骨前後移動距離, 身体重心, 足圧中心, 床反力前後分力, 膝関節モーメント, 大腿四頭筋・大腿二頭筋及び腓腹筋筋電図を同期計測した.脛骨前後移動距離はKnee Motion Analyzerにて, 身体重心, 足圧中心は3次元動作解析装置VICONにて, 床反力, 膝関節モーメントは床反力計のデータを加えて解析した.膝関節固定下における身体運動中の脛骨前後移動は, 身体重心, 足圧中心, 膝関節モーメントと有意な相関関係を示した.脛骨前方移動距離が増大したのは, 身体重心後方時, 足圧中心後方時で膝関節伸展モーメントが大きくなるときであった.またACL外傷群はコントロール群に比べ身体運動中の脛骨前後移動距離が有意に大きかった.