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BioMed Research International
Volume 2014, Article ID 236486, 8 pages
http://dx.doi.org/10.1155/2014/236486
Research Article

Sliding and Lower Limb Mechanics during Sit-Stand-Sit Transitions with a Standing Wheelchair

1Department of Occupational Therapy, College of Health Science, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan
2Department of Rehabilitation Medicine, Kaohsiung Municipal United Hospital, Kaohsiung City, Taiwan

Received 28 February 2014; Revised 30 April 2014; Accepted 30 April 2014; Published 6 July 2014

Academic Editor: Andrew H. Hansen

Copyright © 2014 Yu-Sheng Yang et al. 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.

Abstract

Purpose. This study aimed to investigate the shear displacement between the body and backrest/seat, range of motion (ROM), and force acting on the lower limb joints during sit-stand-sit transitions by operating an electric-powered standing wheelchair. Methods and Materials. The amounts of sliding along the backrest and the seat plane, ROM of lower limb joints, and force acting on the knee/foot were measured in twenty-four people with paraplegia. Results. Without an antishear mechanism, the shear displacement was approximately 9 cm between the user’s body and the backrest/seat surfaces. During standing up, the user’s back slid down and the thigh was displaced rearward, but they moved in opposite directions when wheelchair sat back down. A minimum of 60 degrees of ROM at the hip and knee was needed during sit-stand-sit transitions. The maximal resultant forces acting on the knee restraints could reach 23.5% of body weight. Conclusion. Sliding between the body and backrest/seat occurred while transitioning from sitting to standing and vice versa. A certain amount of ROM at lower limb joints and force acting on the knee was necessitated during sit-stand-sit transitions. Careful consideration needs to be given to who the user of the electric powered standing wheelchair is.