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Plantar pressure analysis of above-knee amputee with a developed microprocessor-controlled prosthetic knee

Cao W., Yu H., Meng Q., Li S.

Acta of Bioengineering and Biomechanics

2018

Vol. 20, no. 4

33--40

Human gait motion analysis was one useful method for lower limb prosthesis study. The most often measured parameters were plantar pressure, kinetic and kinematic parameters. It was indispensable for prosthetic knee design and performance assessment. The aim of this study was to analysis the plantar pressure in traumatic above-knee amputee equipped with a developed microprocessor-controlled prosthetic knee. Methods: The maximum force of forefoot and rearfoot, the average vertical reaction force and pressure and the centre of pressure (COP) offset trajectories of ten above-knee amputees under different walking speeds were obtained. Results: Both forefoot and rearfoot force were bigger in intact leg than prosthetic leg. As the speed increased, the pressure increased in both sides. Forefoot bore more pressure than rearfoot in both legs. The average vertical pressure and force both increased along with the increase of speed. The force and pressure of intact side were always bigger than the prosthetic side. The trend of COP and gait line of the prosthetic and intact side had no significant difference. The length of the gait line of prosthetic side was greater than the intact side. Conclusions: The results of this study exhibited reduced plantar pressure in the prosthetic side. The typical butterfly diagrams were produced during different walking speeds. It indicated that the stability of the microprocessor-controlled prosthetic knee could be guaranteed.

A powered prosthetic knee joint inspired from musculoskeletal system

Dabiri Y., Najarian S., Eslami M. R., Zahedi S., Moser D.

Biocybernetics and Biomedical Engineering

2013

Vol. 33, no. 2

118--124

This paper reports on a powered prosthetic knee joint powered by artificial muscles. A musculoskeletal system integrating artificial and biological muscles was simulated. The gait cycle was divided into seven modes. Based on the results of the simulation, the artificial muscles were pressurized to provide the biological knee torque. Analysis of the gait trials of an amputee showed the timing of artificial muscles was similar to EMG of biological knee muscles. This paper is an initial step forward to implement the concept of biomimetic approach in prosthetic knee technology.

Contact mechanics of a graded layered bearing surface for knee prosthesis

Virdee S. S., Jin Z. M.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, no 3

1025-1032

Recent studies have shown that a full fluid film lubrication regime can be developed in artificial knee joint replacements under simulated steady-state walking conditions by employing a thin compliant bearing surface with an elastic modulus similar to that of natural articular cartilage (Unsworth et al., 1988); Auger et al., 1993). The compliant bearing surface is usually bonded to a relatively stiff substrate in order to provide the structure support. Due to the abrupt change in stiffness, high interfacial shear strain is developed between the compliant layer and the stiff substrate and de-bonding usually occurs. The de-bonding problem can be expected to be alleviated to a certain extent by using functionally graded materials with variable stiffness. The purpose of this study was to analyze the contact mechanics of these functionally graded materials, with particular reference to knee prostheses. The finite element method was used to predict the contact parameters including the predicted contact pressure at the bearing surfaces and the interfacial shear strain between the compliant layer and the polymeric substrate.