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Clinical Trial
. 2014:2014:236486.
doi: 10.1155/2014/236486. Epub 2014 Jul 6.

Sliding and lower limb mechanics during sit-stand-sit transitions with a standing wheelchair

Yu-Sheng Yang  1 , Ming-De Chen  1 , Wei-Chien Fang  2 , Jyh-Jong Chang  1 , Chang-Chih Kuo  1
Affiliations
Clinical Trial

Sliding and lower limb mechanics during sit-stand-sit transitions with a standing wheelchair

Yu-Sheng Yang et al. Biomed Res Int. 2014.

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.

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Figures

Figure 1
Figure 1
Experimental setting.
Figure 2
Figure 2
Representative plot (subject number 14, Trial 1) of shear displacement of the user's body sliding along the backrest (BS) and sliding along the seat (SS) as the seat-back angle of the standing wheelchair transformed from sit-to-stand and vice versa.
Figure 3
Figure 3
Representative plot (subject number 10) of lower extremity joint angle motion as the seat-back angle of the standing wheelchair transformed from sit-to-stand and vice versa.
Figure 4
Figure 4
Representative plot (subject number 10) of the resultant forces acting on the knee as the seat-back angle of the standing wheelchair transformed from sit-to-stand and vice versa.
See this image and copyright information in PMC

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