Journal of Rehabilitation Research & Development (JRRD)

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Volume 49 Number 4, 2012
   Pages 567 — 582

Abstract — Computer-socket manufacturing error: How much before it is clinically apparent?

Joan E. Sanders, PhD;1–3* Michael R. Severance, MSE;1 Kathryn J. Allyn, CPO1
Departments of 1Bioengineering, 2Rehabilitation Medicine, and 3Mechanical Engineering, University of Washington, Seattle, WA

Abstract–The purpose of this research was to pursue quality standards for computer-manufacturing of prosthetic sockets for people with transtibial limb loss. Thirty-three duplicates of study participants– normally used sockets were fabricated using central fabrication facilities. Socket-manufacturing errors were compared with clinical assessments of socket fit. Of the 33 sockets tested, 23 were deemed clinically to need modification. All 13 sockets with mean radial error (MRE) greater than 0.25 mm were clinically unacceptable, and 11 of those were deemed in need of sizing reduction. Of the remaining 20 sockets, 5 sockets with interquartile range (IQR) greater than 0.40 mm were deemed globally or regionally oversized and in need of modification. Of the remaining 15 sockets, 5 sockets with closed contours of elevated surface normal angle error (SNAE) were deemed clinically to need shape modification at those closed contour locations. The remaining 10 sockets were deemed clinically acceptable and not in need modification. MRE, IQR, and SNAE may serve as effective metrics to characterize quality of computer-manufactured prosthetic sockets, helping facilitate the development of quality standards for the socket manufacturing industry.

Keywords: AAOP, alignment, amputee, CAD/CAM, central fabrication, prosthesis, radial error, socket rectification, socket shape, transtibial.


View HTML  ¦  View PDF  ¦  Contents Vol. 49, No. 4
This article and any supplementary material should be cited as follows:
Sanders JE, Severance MR, Allyn KJ. Computer-socket manufacturing error: How much before it is clinically apparent? J Rehabil Res Dev. 2012;49(4):567–82.
http://dx.doi.org/10.1682/JRRD.2011.05.0097
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Last Reviewed or Updated  Wednesday, May 30, 2012 10:22 AM

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