Abstract
Above-knee amputation significantly reduces the amputee’s mobility and physical condition that can be built up through training or other sports activities. Alpine skiing is one of them. This paper deals with an above-knee prosthesis, which provides better kinematics of the leg structure. Imitating the kinematics of the human body, we looked for the kinematics of a system that comes closest to imitating natural movement and replace the missing limb to the highest possible degree. Based on the analysis of human leg kinematics and entire human mass system dynamics, a prototype for a special multi-axis prosthetic knee was developed. Measurements of leg movement during skiing were performed, which served as a basis for the concept. The concept was verified by kinematics, dynamics and strength analysis, and a complete geometric model was made. The concept was then verified on a working prototype, tested on a ski slope.
Highlights
The number of lower limb amputations has been significantly increasing in recent years [1]
The prosthetic knee is of particular importance for skiing and the kinematics of human structure because skiing and sports activities in general require the dynamics of the human body as the key element of motor skills [9]
Developing the prosthetic knee concept, the principle of making a simple and low-cost prosthesis, which would at the same time closely imitate natural movement, was followed
Summary
The number of lower limb amputations has been significantly increasing in recent years [1]. Strojniški vestnik - Journal of Mechanical Engineering 57(2011) 768777 enough forward movement of the knee, which moves the gravity centre of the body backwards This results in the skier losing dynamic balance and control of the skis (Fig. 3). The prosthetic knee is of particular importance for skiing and the kinematics of human structure because skiing and sports activities in general require the dynamics of the human body as the key element of motor skills [9]. We tried to improve it in such a way as to come closest to natural movement This was followed by building a virtual model of the prosthetic knee, which required verification of its strength suitability. A prototype was built and tested on a ski slope
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