臨床整形外科53巻7号

2018年07月発行

誌上シンポジウム 膝前十字靱帯のバイオメカニクス

変形挙動から探るACLの力学機能

著者： 藤江裕道¹ 山川学志¹

所属機関： ¹首都大学東京大学院システムデザイン研究科機械システム工学域

ページ範囲：P.555 - P.562

　関節力学試験ロボットシステムと画像解析システムを用いて，ヒト膝関節に前方力を作用させた際の前十字靱帯(ACL)の変形挙動を観察し，引張ひずみ分布を求めた．その結果，伸展位では前方力作用とともにACL全体が緊張し，前方力100N作用時の引張ひずみは，ACL全体で2.1％であった．これに対し，屈曲位では緊張部位がACL前方線維に集中し，前方力100N作用時の前方線維の引張ひずみは30°屈曲位で3.1％，60°屈曲位で5.0％であった．屈曲位では，ACL前方線維の大腿骨付着部上で線維の折れ曲がりが観察されたが，前方力が増大すると，この折れ曲がりは後方に移動しながら縮小し，前方線維の緊張部位が大腿骨付着部最後端に向けて伸展した．得られた結果は，ACLの力学機能を理解するうえで極めて重要であると考えられた．

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