Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/35368
標題: 不對稱步態之生物力學效應研究
Study on Biomechanical Effects of Asymmetric Gait
作者: 紀偉民
Chi, Wei-Min
關鍵字: asymmetric gait;不對稱步態;joint moment;scoliosis;vertebral body axial rotation;關節力矩;脊椎側彎;椎體軸向旋轉
出版社: 生物產業機電工程學系所
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摘要: 
本論文的主旨為研究不對稱步態個體在平地步行時的生物力學效應以及提出脊柱曲線變形後測量橫斷面上椎體軸向旋轉量的方法。
本研究以複擺數學模型計算個體左右二側髖關節之關節力矩、關節功率,並比較二側髖關節在不對稱步態型態下之單腳站立期中關節作用力、力矩及功率。研究結果顯示:二位結構性長短腿個案之長腿側髖關節所受作用力約為短腿側的1.3倍,另一位具有Trendelenburg症的功能性長短腿個案很顯著地長腿側的關節力矩和功率在冠狀面上的分量比短腿側大出2倍以上。因此,臨床上可由冠狀面上的關節力矩和功率作為評估外展肌群在單腳站立期活動的量化依據。
不對稱步態或下肢不等長所引起的脊椎側彎或脊柱曲線變形中,最難以準確測量的是橫斷面上的脊椎椎體軸向旋轉量。本研究從傳統站立的前後照X光片分析椎體不規則結構在X光影像上的特徵點,利用椎體在解剖上的幾何關係定義出椎體形狀參數,及數學上的三角幾何關係,經由數值迭代法的演算,提出一種量測脊柱軸向旋轉量的新方法可獲得比以前方法更為準確的椎體旋轉量數值。為了證明此方法的準確性,本研究設計一個可以讓人體腰椎椎骨(cadaver)作軸向旋轉的裝置,利用本文所提出的方法作測量,並以電腦斷層影像(CT影像)所定義出的軸向旋轉量作為對應的標準值。最後與傳統的四個方法以均方根值(RMS)作比較,證明本研究所提出的方法可以獲得較為準確及可靠的椎體軸向旋轉量。

This investigation determined biomechanical effects of asymmetrical gait subjects during level walking, and developed a method for estimating the rotation angle in the transverse plane of a vertebral body in a deformity spinal column.
This work determined joint forces, moments, power of bilateral hips by an invert double pendulum mathematical model. Bilateral comparison of joint forces, moments and powers during single-leg stance could reveal asymmetrical gait patterns. According to the results, hip resultant force on long leg side was 1.3 times higher than opposite side proposed by two structural leg length discrepancy patients, and the hip joint moments and powers in the frontal plane on long (left) leg side were obviously twice larger than opposite side proposed by the functional leg length discrepancy subjects which had Trendelenburg symptoms. Employment of hip joint moments and powers in the frontal plane could estimate the action of the abductors and help for clinical diagnosis.
The vertebral body rotation in the transverse plane was very difficult to estimate in the scoliosis or spinal column deformity caused by asymmetrical gait or leg length discrepancy. This study presents a new method for measuring axial rotation of vertebra. Anatomical landmarks of vertebral bodies were first identified in X-ray film. By means of appropriate geometrical relationships, vertebral body shape parameters, and a computer iteration method, the rotation angle of vertebrae on the transverse plane could rapidly be obtained. A cadaver lumbar spine axial rotation-fixation device was designed to confirm the accuracy of the proposed methodology. Rotation angles on CT images were adopted as the golden standard and compared with analytical results based on X-ray films for verifying the reliability. Simultaneously, this study compared root mean square values of the proposed method and four traditional methods with golden standard. Finally, the comparison results demonstrated the proposed method obtained more accurate and reliable results than previous methods.
URI: http://hdl.handle.net/11455/35368
其他識別: U0005-1801200714510100
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