股関節回転中心に関する人体下肢慣性モーメント(I_O)の推定値について : その1
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概要
- 論文の詳細を見る
人体関節機構の動力学的研究にたずさわる者にとって、慣性モーメントは重要なパラメーターの1つである。臨床的に人体各部の慣性モーメントを測定することは不可能ではないが、通常は死体計測値に比べ誤差が大きい。それ故にある意味で、死体計測値は臨床的計測に際しよい指標となる。1955年DEMPSTERは8死体16肢の慣性モーメントを測定し報告している。彼が計算に用いた数式ならびに測定値は、それぞれ表1-aと表2に示してある。又彼が計算により求めた股関節に関する下肢慣性モーメント(I'_O)も表2右に示した。しかしながらこの値は、臨床的測定値あるいは他の報告にみる値に比べ約1000倍も大きい値である。以下にその検算を行ってみた。求められたI'_Oは、公式(2)も満足させるはずであり、DEMPSTERの測定した自由振動周期Tは記載がないので公式(3)により計算し、T'として表3に示した。通常人体下肢の自由振動周期は1.5秒前後であるのに比べ、求められたT'は約30倍も大きい。もしも彼が質量Mのところに誤って下肢重量を代入しだとすれば、求められたI'_Oは;I'_O =I_O×g となり、従ってT'は;T'=T×√<g>≒31.30×T となるであろう。補正されたTは表3に示した通りである。補正値は下肢の自由振動周期として妥当なものである。従って質量Mに重量が代入されていると考えざるを得ないわけで、DEMPSTERの求めたI'_Oは重力加速度gで徐ずることにより妥当な値に補正される。補正されたI_Oは表3に示した通りで、臨床的整体計測時のよい参考となるものである。
- バイオメカニズム学会の論文
著者
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Takahashi Kazuhisa
Department Of Orthopaedic Surgery Chiba University Graduate School Of Medicine
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林 道夫
Department Of Orthopaedic Surgery School Of Medicine Chiba University
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Murata Tadao
Department of Orthopaedic Surgery School of Medicine, Chiba University
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Murata Tadao
Department Of Electrical Engineering And Computer Science The University Of Illinois
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Murata Tadao
Department Of Orthopaedic Surgery School Of Medicine Chiba University
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Takahashi Kazuhisa
Department Of Applied Chemistry Faculty Of Science Science University Of Tokyo
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Takahashi Kazuhisa
Department of Orthopaedic Surgery School of Medicine, Chiba University
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- 股関節回転中心に関する人体下肢慣性モーメント(I_O)の推定値について : その2
- 股関節回転中心に関する人体下肢慣性モーメント(I_O)の推定値について : その1
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