TY - JOUR
T1 - A computer simulation of human walking in persons with joint contractures
AU - Kagaya, Hitoshi
AU - Ito, Shunichi
AU - Iwami, Takehiro
AU - Obinata, Goro
AU - Shimada, Yoichi
PY - 2003/5/1
Y1 - 2003/5/1
N2 - Joint contractures decrease the patient's ability to walk, but usually other parts of the body compensate the affected joint contractures. When we restore the gait performance in paraplegic patients by means of functional electrical stimulation, however, we cannot expect complications of compensation. A computer simulation was done to clarify how the contractures affect the gait pattern when no complications of compensation were expected. A seven-segment link mechanical model was used for simulation of human walking in the sagittal plane. In turn, using a personal computer stance and swing-leg joint contractures of the ankle, knee, and/or hip were simulated. When stance-leg contracture was simulated, step length became short with increasing hip flexion contracture. The trunk was tilted backward during knee flexion or ankle plantarflexion contracture simulation. When the swing-leg contracture was simulated, step length became short with increasing knee flexion contracture. We found that hip or knee flexion contracture of 15° or ankle plantarflexion contracture of < 0° was required to maintain positive step length and forward movement of the center of gravity. These findings suggest that 15° of hip and knee flexion contracture, and 0° of ankle plantarflexion contracture are critical when gait restoration is performed by functional electrical stimulation.
AB - Joint contractures decrease the patient's ability to walk, but usually other parts of the body compensate the affected joint contractures. When we restore the gait performance in paraplegic patients by means of functional electrical stimulation, however, we cannot expect complications of compensation. A computer simulation was done to clarify how the contractures affect the gait pattern when no complications of compensation were expected. A seven-segment link mechanical model was used for simulation of human walking in the sagittal plane. In turn, using a personal computer stance and swing-leg joint contractures of the ankle, knee, and/or hip were simulated. When stance-leg contracture was simulated, step length became short with increasing hip flexion contracture. The trunk was tilted backward during knee flexion or ankle plantarflexion contracture simulation. When the swing-leg contracture was simulated, step length became short with increasing knee flexion contracture. We found that hip or knee flexion contracture of 15° or ankle plantarflexion contracture of < 0° was required to maintain positive step length and forward movement of the center of gravity. These findings suggest that 15° of hip and knee flexion contracture, and 0° of ankle plantarflexion contracture are critical when gait restoration is performed by functional electrical stimulation.
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U2 - 10.1620/tjem.200.31
DO - 10.1620/tjem.200.31
M3 - Article
C2 - 12862309
AN - SCOPUS:0043204441
SN - 0040-8727
VL - 200
SP - 31
EP - 37
JO - Tohoku Journal of Experimental Medicine
JF - Tohoku Journal of Experimental Medicine
IS - 1
ER -