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Journal of Healthcare Engineering
Volume 1, Issue 2, Pages 217-238
Research Article

Lying Posture Classification for Pressure Ulcer Prevention

Aung Phyo Wai,1 Siang Fook Foo,1 Weimin Huang,1 Jit Biswas,1 Chi-Chun Hsia,2 Koujuch Liou,2 and Philip Yap3

1Institute for Infocomm Research, 1 Fusionopolis Way #21-01 Connexis, 138632, Singapore
2Industrial Technology Research Institute, ITRI South, No. 31, Gongye 2nd Rd., Annan District, Tainan City 709, Taiwan
3Alexandra Hospital, 378, Alexandra Road, 159964, Singapore

Copyright © 2010 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Pressure ulcers are a common problem among patients with limited mobility, such as those bed-bound and wheelchair-bound. Constant and prolonged applied pressure is one of the extrinsic factors contributing to the development of pressure ulcers. Analyzing lying postures together with interface pressure measurements from a pressure sensitive bed helps revealing pressure hot spots that can potentially lead to pressure ulcer development. We propose an intelligent system that features lying posture classification with pressure hot spots identification based on interface pressure measurements to possibly identify potential pressure ulcer risk and to provide effective preventive measures. Experimental outcomes correctly classify different lying postures with an accuracy of up to 93%. The proposed system is expected to assist caregivers to detect risk evidence and to provide timely and appropriate interventions for effective pressure ulcer prevention.