Central fabrication

Sanders, Joan E.; Severance, Michael R.; Myers, Timothy R; Ciol, Márcia A.

doi:10.1177/0309364610394476

Cited by 11 publications

(14 citation statements)

References 22 publications

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“…In postprocessing algorithms, we corrected for vertical translation of the stylus tip from rotation of the stylus arm about the RVDT axis. The instrument had a radial resolution better than 0.08 mm and measured socket volume differences less than 0.1 percent [1–2]. We measured each socket from the patellar tendon to the distal end at cross-sections spaced at 0.8 mm.…”

Section: Methodsmentioning

confidence: 99%

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

Sanders¹,

Severance²,

Allyn³

2012

JRRD

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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.

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Section: Methodsmentioning

confidence: 99%

“…In recent studies, we found considerable variability in the quality of prosthetic sockets fabricated by central fabrication facilities using computer-socket manufacturing methods [1–2]. Fabrication errors might not be identified by the practitioner until the socket is test-fit to the patient because errors are often hard to see by eye.…”

Section: Introductionmentioning

confidence: 99%

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

Sanders¹,

Severance²,

Allyn³

2012

JRRD

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“…Clearly shown in previous reports in the literature [2,10], variability exists in quality and consistency among different fabrication facilities that make prosthetic models and sockets for patients with amputation. It would therefore seem reasonable for facilities to assess their manufacturing equipment as part of their regular practice.…”

Section: Discussionmentioning

confidence: 96%

Assessment technique for computer-aided manufactured sockets

Sanders

Severance

2011

JRRD

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Abstract-This article presents an assessment technique for testing the quality of prosthetic socket fabrication processes at computer-aided manufacturing facilities. The assessment technique is potentially useful to both facilities making sockets and companies marketing manufacturing equipment seeking to assess and improve product quality. To execute the assessment technique, an evaluator fabricates a collection of test models and sockets using the manufacturing suite under evaluation, then measures their shapes using scanning equipment. Overall socket quality is assessed by comparing socket shapes with electronic file (e-file) shapes. To characterize carving performance, model shapes are compared with e-file shapes. To characterize forming performance, socket shapes are compared with model shapes. The mean radial error (MRE), which is the average difference in radii between the two compared shapes, provides insight into sizing quality. Interquartile range (IQR), the range of radial error for the best-matched half of the points on the compared socket surfaces, provides insight into regional shape quality. The source(s) of socket shape error may be pinpointed by separately determining MRE and IQR for carving and forming. The developed assessment technique may provide a useful tool to the prosthetics community and industry to help identify problems and limitations in computer-aided manufacturing and give insight into appropriate modifications to overcome them.

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“…The RadialWeight was 0.2 and the NormalWeight was 0.8. The basis for selecting these weights was prior clinical experience where we found that a RadialWeight/NormalWeight of 0.8/0.2 performed well for comparing residual limb shapes and 0.2/0.8 worked well for comparing socket shapes [7,8,9]. …”

Section: Methodsmentioning

confidence: 99%

“…Locations in which they do align well are white. These metrics were selected because similar metrics were used effectively in previous research assessing manufacturing quality of prosthetic sockets [6] and positive models [9], and the clinical impact of socket shape error [8]. Radial difference data has been used effectively in commercial software packages in the prosthetics industry for socket design to compare socket and limb shapes.…”

Section: Methodsmentioning

confidence: 99%

Influence of prior activity on residual limb volume and shape measured using plaster casting: Results from individuals with transtibial limb loss

Sanders

Severance²,

Swartzendruber³

et al. 2013

J Rehabil Res Dev

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The purpose of this research was to determine if prior activity affected the shape of a plaster cast taken of a trans-tibial residual limb. Plaster casts were taken twice within a day on 24 participants with trans-tibial limb loss, with 5 s between doffing and casting in one trial (PDI-5s), and 20 min in the other trial (PDI-20m). The ordering of the trials was randomized. The mean radial difference between PDI-20m and PDI-5s was 0.34mm (s.d. 0.21) when PDI-5s was conducted first and −0.02mm (s.d. 02.0) when PDI-20m was conducted first. Ordering of the trials had a statistically significant influence on the mean radial difference between the two shapes (p=0.008). The result shows that prior activity influenced the residual limb cast shape. Practitioners should be mindful of prior activity and doffing history when casting an individual’s limb for socket design and prosthetic fitting.

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Central fabrication

Cited by 11 publications

References 22 publications

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

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

Assessment technique for computer-aided manufactured sockets

Influence of prior activity on residual limb volume and shape measured using plaster casting: Results from individuals with transtibial limb loss

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