Journal of Rehabilitation Research & Development (JRRD)

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Volume 49 Number 4, 2012
   Pages 523 — 534

Abstract — Efficiency of voluntary opening hand and hook prosthetic devices: 24 years of development?

Gerwin Smit, MSc;1* Raoul M. Bongers, MSc, PhD;2 Corry K. Van der Sluis, MD, PhD;3 Dick H. Plettenburg, MSc, PhD1
1Delft Institute of Prosthetics and Orthotics, Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands; 2Center of Human Movement Sciences and 3Department of Rehabilitation Medicine, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands

Abstract–Quantitative data on the mechanical performance of upper-limb prostheses are very important in prostheses development and selection. The primary goal of this study was to objectively evaluate the mechanical performance of adult-size voluntary opening (VO) prosthetic terminal devices and select the best tested device. A second goal was to see whether VO devices have improved in the last two decades. Nine devices (four hooks and five hands) were quantitatively tested (Hosmer model 5XA hook, Hosmer Sierra 2 Load VO hook, RSL Steeper Carbon Gripper, Otto Bock model 10A60 hook, Becker Imperial hand, Hosmer Sierra VO hand, Hosmer Soft VO hand, RSL Steeper VO hand, Otto Bock VO hand). We measured the pinch forces, activation forces, cable displacements, mass, and opening span and calculated the work and hysteresis. We compared the results with data from 1987. Hooks required lower activation forces and delivered higher pinch forces than hands. The activation forces of several devices were very high. The pinch forces of all tested hands were too low. The Hosmer model 5XA hook with three bands was the best tested hook. The Hosmer Sierra VO hand was the best tested hand. We found no improvements in VO devices compared with the data from 1987.

Keywords: body powered, efficiency, hysteresis, prosthetic design, prosthetic evaluation, prosthetic hand, prosthetics, qualitative testing, upper limb, voluntary opening.

View HTML  ¦  View PDF  ¦  Contents Vol. 49, No. 4
This article and any supplementary material should be cited as follows:
Smit G–, Bongers RM, Van der Sluis CK, Plettenburg DH. Efficiency of voluntary opening hand and hook prosthetic devices: 24 years of development? J Rehabil Res Dev. 2012;49(4):523–34.
ResearcherID: Gerwin Smit, MSc: B-9994-2012; Raoul M. Bongers, MSc, PhD: C-1094-2012; Corry K. Van der Sluis, MD, PhD: C-1102-2012; Dick H. Plettenberg, MSc, PhD: C-1078-2012


Last Reviewed or Updated  Wednesday, May 30, 2012 10:21 AM

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