Reliability and validity of the iSense optical scanner for measuring volume of transtibial residual limb models

Armitage, L; Kwah, LK; Kark, L

Reliability and validity of the iSense optical scanner for measuring volume of transtibial residual limb models

Armitage, L

Kwah, LK

Kark, L

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Publisher:: SAGE Publications
Publication Type:: Journal Article
Citation:: Prosthetics and Orthotics International, 2019, 43 (2), pp. 213 - 220
Issue Date:: 2019-04

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Field	Value	Language
dc.contributor.author	Armitage, L https://orcid.org/0000-0001-7837-0640	en_US
dc.contributor.author	Kwah, LK https://orcid.org/0000-0002-9809-9859	en_US
dc.contributor.author	Kark, L	en_US
dc.date.issued	2019-04	en_US
dc.identifier.citation	Prosthetics and Orthotics International, 2019, 43 (2), pp. 213 - 220	en_US
dc.identifier.issn	0309-3646	en_US
dc.identifier.uri	http://hdl.handle.net/10453/139314
dc.description.abstract	<jats:sec><jats:title>Background:</jats:title><jats:p> Residual limb volume is often measured as part of routine care for people with amputations. These measurements assist in the timing of prosthetic fitting or replacement. In order to make well informed decisions, clinicians need access to measurement tools that are valid and reliable. </jats:p></jats:sec><jats:sec><jats:title>Objectives:</jats:title><jats:p> To assess the reliability and criterion validity of the iSense optical scanner in measuring volume of transtibial residual limb models. </jats:p></jats:sec><jats:sec><jats:title>Study Design:</jats:title><jats:p> Three assessors performed two measurements each on 13 residual limb models with an iSense optical scanner (3D systems, USA). Intra-rater and inter-rater reliability were calculated using intraclass correlation coefficients. Bland Altman plots were inspected for agreement. Criterion validity was assessed using a steel rod of known dimensions. Ten repeated measurements were performed by one assessor. A t-test was used to determine differences between measured and true rod volume. </jats:p></jats:sec><jats:sec><jats:title>Results:</jats:title><jats:p> Intra-rater reliability was excellent (range of intraclass correlation coefficients: 0.991–0.997, all with narrow 95% confidence intervals). While the intraclass correlation coefficients suggest excellent inter-rater reliability between all three assessors (range of intraclass correlation coefficients: 0.952–0.986), the 95% confidence intervals were wide between assessor 3 and the other two assessors. Poor agreement with assessor 3 was also seen in the Bland-Altman plots. Criterion validity was very poor with a significant difference between the mean iSense measurement and the true rod volume (difference: 221.18 mL; p < 0.001). </jats:p></jats:sec><jats:sec><jats:title>Conclusions:</jats:title><jats:p> Although intra-rater reliability was excellent for the iSense scanner, we did not find similar results for inter-rater reliability and validity. These results suggest that further testing of the iSense scanner is required prior to use in clinical practice. </jats:p></jats:sec><jats:sec><jats:title>Clinical relevance</jats:title><jats:p> The iSense offers a low cost scanning option for residual limb volume measurement. Intra-rater reliability was excellent, but inter-rater reliability and validity were such that clinical adoption is not indicated at present. </jats:p></jats:sec>	en_US
dc.language	en	en_US
dc.publisher	SAGE Publications	en_US
dc.relation.ispartof	Prosthetics and Orthotics International	en_US
dc.relation.isbasedon	10.1177/0309364618806038	en_US
dc.subject.classification	Rehabilitation	en_US
dc.title	Reliability and validity of the iSense optical scanner for measuring volume of transtibial residual limb models	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	43	en_US
utslib.for	0903 Biomedical Engineering	en_US
utslib.for	1106 Human Movement and Sports Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Graduate School of Health
utslib.copyright.status	closed_access
pubs.consider-herdc	false	en_US
pubs.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	43	en_US

Abstract:

Background: Residual limb volume is often measured as part of routine care for people with amputations. These measurements assist in the timing of prosthetic fitting or replacement. In order to make well informed decisions, clinicians need access to measurement tools that are valid and reliable. Objectives: To assess the reliability and criterion validity of the iSense optical scanner in measuring volume of transtibial residual limb models. Study Design: Three assessors performed two measurements each on 13 residual limb models with an iSense optical scanner (3D systems, USA). Intra-rater and inter-rater reliability were calculated using intraclass correlation coefficients. Bland Altman plots were inspected for agreement. Criterion validity was assessed using a steel rod of known dimensions. Ten repeated measurements were performed by one assessor. A t-test was used to determine differences between measured and true rod volume. Results: Intra-rater reliability was excellent (range of intraclass correlation coefficients: 0.991–0.997, all with narrow 95% confidence intervals). While the intraclass correlation coefficients suggest excellent inter-rater reliability between all three assessors (range of intraclass correlation coefficients: 0.952–0.986), the 95% confidence intervals were wide between assessor 3 and the other two assessors. Poor agreement with assessor 3 was also seen in the Bland-Altman plots. Criterion validity was very poor with a significant difference between the mean iSense measurement and the true rod volume (difference: 221.18 mL; p < 0.001). Conclusions: Although intra-rater reliability was excellent for the iSense scanner, we did not find similar results for inter-rater reliability and validity. These results suggest that further testing of the iSense scanner is required prior to use in clinical practice. Clinical relevance The iSense offers a low cost scanning option for residual limb volume measurement. Intra-rater reliability was excellent, but inter-rater reliability and validity were such that clinical adoption is not indicated at present.

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http://hdl.handle.net/10453/139314