This article and any supplementary material should be cited as follows: Sanders JE, Severance MR, Allyn KJ. Computer-socket manufacturing error: How much.

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Presentation transcript:

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 ;49(4):567–82. Slideshow Project DOI: /JRRD JSP Computer-socket manufacturing error: How much before it is clinically apparent? Joan E. Sanders, PhD; Michael R. Severance, MSE; Kathryn J. Allyn, CPO

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 ;49(4):567–82. Slideshow Project DOI: /JRRD JSP Aim – Pursue quality standards for computer-manufacturing of prosthetic sockets for people with transtibial limb loss. Relevance – Recent studies found considerable variability in quality of prosthetic sockets fabricated by central fabrication facilities using computer-socket manufacturing methods. – Practitioner may not identify fabrication errors until socket is test-fit to patient because errors are often hard to see.

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 ;49(4):567–82. Slideshow Project DOI: /JRRD JSP Methods 33 duplicates of study participants’ normally used sockets were fabricated using central fabrication facilities. Socket manufacturing errors were compared with clinical assessment of socket fit.

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 ;49(4):567–82. Slideshow Project DOI: /JRRD JSP Results 23 sockets tested needed modification. – 13 sockets with mean radial error (MRE) >0.25 mm were clinically unacceptable. 11 needed sizing reduction. – 5 with interquartile range (IQR) >0.40 mm were globally or regionally oversized. – 5 with closed contours of elevated surface normal angle error (SNAE) needed shape modification at these closed contour locations. 10 sockets were clinically acceptable and needed no modification.

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 ;49(4):567–82. Slideshow Project DOI: /JRRD JSP Results Stress concentrations for concave and convex socket shaping errors. (a) Concave (pushed-in) socket shaping error focuses stresses over surface of circular pushed-in region. (b) Convex (pulled-out) focuses stresses at circumference of pulled-out region.

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 ;49(4):567–82. Slideshow Project DOI: /JRRD JSP Conclusions MRE, IQR, and SNAE are effective metrics for characterizing quality of computer- manufactured prosthetic sockets. – Help facilitate development of quality standards for socket manufacturing industry.