Dabiri Yaghoub, Najarian Siamak, Eslami M Reza, Zahedi Saeed, Moser David, Shirzad Elham, Allami Mostafa
Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran.
Kobe J Med Sci. 2010 Sep 30;56(3):E92-7.
A computer simulation was carried out to investigate the forces of lower extremity muscles in the swing phase of a transtibial amputee gait. With each muscle as an ideal force generator, the lower extremity was simulated as a two-degrees of freedom linkage with the hip and knee as its joints. Kinematic data of hip and knee joints were recorded by a motion analysis system. Through a static optimization approach, the forces exerted by muscles were determined so that recorded hip and knee joint angles were produced. Simulation results showed that when the mass of prosthetic foot is increased, muscle forces increase, too. This result is in accord with experimental and theoretical studies that reported an increase in leg mass lead to higher electromyography activity of muscles, and energetic of walking. However, since prosthetic foot moment of inertia is smaller than that of thigh and prosthetic shank, its alternation does not have noticeable effect on muscle forces.
进行了计算机模拟，以研究经胫截肢者步态摆动期下肢肌肉的力量。将每块肌肉视为理想的力发生器，将下肢模拟为以髋关节和膝关节为关节的二自由度连杆机构。通过运动分析系统记录髋关节和膝关节的运动学数据。通过静态优化方法确定肌肉施加的力，以便产生记录的髋关节和膝关节角度。模拟结果表明，当假足质量增加时，肌肉力量也会增加。这一结果与实验和理论研究一致，这些研究报告称腿部质量增加会导致肌肉的肌电图活动增加以及步行能量增加。然而，由于假足的转动惯量小于大腿和假肢小腿的转动惯量，其变化对肌肉力量没有明显影响。
