Power Assessment of the Human Ankle during the Stance Phase of Walking for Designing a Safe Active Prosthesis in Below-Knee Amputees
Applied and Computational Mathematics
Volume 4, Issue 2-1, April 2015, Pages: 7-11
Received: Feb. 2, 2015;
Accepted: Feb. 5, 2015;
Published: Mar. 2, 2015
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Sara Soltani Ch., Faculty of Biomedical Engineering, Islamic Azad University, Science and Research branch, Tehran, Iran
Ali Esteki, Department of Biomechanics, Medical Physics and Engineering, School of Medicine, Shahid Beheshti University (Medical Campus), Tehran, Iran
Many studies have been done on the biological human ankle and prosthesis replaced with this limb. Although some of these works targeted to design a prosthesis which mimics the behavior of biological ankle, additional system is required to support the elastic components; any of them have obviously introduced an active system in designing ankle prosthesis until now. In this study the power of the non-disabled human ankle joint was examined during the stance phase of walking in sagittal plane. The study aimed to better understand the ankle’s dynamic behavior for designing foot prosthesis with active mechanism. Kinematic and Kinetic data of the lower limb were collected from 18 healthy, young subjects (i.e. 6 females and 13 males) walking over a speed range of slow, normal and fast (i.e. 0.86 to 1.80 m/s). The ankle moment versus angle curves were plotted and total, mean and maximum values of powers were calculated for each trial. The results indicated that the total, mean and maximum values of the power could increase as the walking speed increased. The main findings of this study were the total, mean and maximum values of the power as a function of the linear velocity of walking. These results showed that the speed of 1.06 m/s was a critical velocity, below which the system was negative, showing energy consumer system, and above it the system was positive, suggesting generated energy. With the intent to design a prosthesis mimicking a biologic foot, an augmented system which is able to adjust the power to the speed is necessary.
Sara Soltani Ch.,
Power Assessment of the Human Ankle during the Stance Phase of Walking for Designing a Safe Active Prosthesis in Below-Knee Amputees, Applied and Computational Mathematics. Special Issue: Quality, Reliability, Safety, and Risk Modeling and Optimization.
Vol. 4, No. 2-1,
2015, pp. 7-11.
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