Evaluation of a new sitting concept designed for prevention of pressure ulcer on the buttock using finite element analysis |
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Authors: | Dohyung Lim Fang Lin Ronald W Hendrix Brian Moran Charles Fasanati " target="_blank">Mohsen Makhsous |
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Institution: | (1) Department of Physical Therapy and Human Movement Sciences, Northwestern University, 645 N Michigan Ave., Suite 1100, Chicago, IL 60611, USA;(2) Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, IL, USA;(3) Department of Orthopaedic Surgery, Northwestern University, Chicago, IL, USA;(4) Department of Radiology, Northwestern University, Chicago, IL, USA;(5) Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL, USA;(6) Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, IL, USA;(7) Department of Biomedical Engineering, Yonsei University, Wonju, Kangwond-do, Korea |
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Abstract: | Excessive compressive load induces pressure related soft tissue damage, i.e. pressure ulcer (PU), in buttock area in wheelchair
users. In solving this problem, our previous study has introduced a concept of Off-Loading sitting, which partially removes the ischial support to reduce pressure under buttocks. However, the effect of this sitting
concept has only been evaluated using the interface pressure and tissue perfusion measurements. The objective of this investigation
was to evaluate the Off-Loading posture for its ability to reduce internal pressure and stress in deep buttock tissues. This evaluation was performed on
a 3D finite element (FE) model which was established and validated in a sitting posture and has realistic material properties
and boundary conditions. FE analysis in this study confirmed that the pressure relief provided by Off-Loading posture created profound effect in reducing the mechanical stress within deep tissues. It was concluded that Off-Loading posture may prove beneficial in preventing sitting related PU. |
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Keywords: | Finite element analysis Pressure ulcer New sitting concept Buttock thigh Wheelchair |
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