Preferred elbow position in confined wheelchair configuration |
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| Authors: | Chien-Ju Lin Po-Chou Lin Fong-Chin Su |
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| Institution: | 1. KU Leuven, Laboratorium voor Akoestiek en Thermische Fysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium;2. STU Bratislava, Stavebná fakulta, Katedra KPS, Radlinského 11, 813 68 Bratislava 15, Slovakia;1. Alumna del posgrado en Tecnología Avanzada del IPN CIITEC Azcapotzalco, Mexico;2. Instituto Politécnico Nacional – CIITEC Azcapotzalco, Cerrada de Cecati S/N, Col. Santa Catarina, Del. Azcapotzalco, C.P. 02250 México, D.F., Mexico;3. Departamento de Ciencias Naturales, DCNI, UAM Cuajimalpa, Pedro Antonio de los Santos 84, C.P. 11850 México, D.F., Mexico;4. Instituto Politécnico Nacional, Centro de Investigación y de Estudios Avanzados (CINVESTAV), Departamento de Ingeniería Eléctrica (SEES), Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, C.P. 07360 México, D.F. Apartado Postal 14-740, 07000 México, D.F., Mexico;5. Centro de Investigaciones en Óptica A.C., A.P. 1-94837150, León, Gto., Mexico;6. Institut des Molécules et Matériaux du Mans, CNRS6283, Université du Maine, 72085 Le Mans Cedex 9, France;1. Key Labs of Data Engineering and Knowledge Engineering, Ministry of Education, China;2. Department of Management Science and Engineering, Tsinghua University, China;3. Department of Systems Engineering and Engineering Management, Chinese University of Hong Kong, Hong Kong, China;4. School of Information, Renmin University of China, China;1. Department of Mathematics, National Changhua University of Education, Changhua 500, Taiwan;2. Department of Mathematics, National Central University, Chung-Li 32001, Taiwan;3. National Center for Theoretical Sciences of Taiwan, Taiwan |
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| Abstract: | High mechanical load leads to pain and damage in the upper extremities of wheelchair users. Wheelchair users suffer a limited range of motion of the upper extremities due to the confining wheelchair configuration. This is a key factor affecting the efficiency of wheelchair propulsion and upper extremity loading. With a view toward further understanding the interaction between the user and wheelchair, this study identifies the accessible workspace of the elbow under conventional wheelchair design and identifies the actual location and range of motion of the elbow during wheelchair propulsion. An eight-camera motion analysis system recorded the kinematics of 14 non-experienced wheelchair users. Users under standardized conservative wheelchair-sitting position moved their right elbow as widely as possible at five different wheel angles while elbow positions were recorded, thereby establishing the maximum possible elbow workspace. Actual positions of the right elbow were recorded during wheelchair propulsion. The arc angles of the elbow workspace range from 68.8° to 83.4° and are located at the lateral and posterior quadrant of the circle on which the elbow trajectories located. Reachable workspace is smaller when the hand holds the hand rim at a larger wheel angle. The preferred positions for propulsion are located approximately 2/3's of the way through the total workspace. The obtained data will be useful for improved wheelchair design and biomechanical modeling of the wheelchair/user system. |
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