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Repeatability and reproducibility of OSSCA: a functional approach for assessing the kinematics of the lower limb

Repeatability and reproducibility of OSSCA: a functional approach for assessing the kinematics of the lower limb
Repeatability and reproducibility of OSSCA: a functional approach for assessing the kinematics of the lower limb
Marker-based gait analysis of the lower limb that uses assumptions of generic anatomical morphology can be susceptible to errors, particularly in subjects with high levels of soft tissue coverage. We hypothesize that a functional approach for assessing skeletal kinematics, based on the application of techniques to reduce soft tissue artefact and functionally identify joint centres and axes, can more reliably (repeatably and reproducibly) assess the skeletal kinematics than a standard generic regression approach. Six healthy adults each performed 100 repetitions of a standardized motion, measured on four different days and by five different observers. Using OSSCA, a combination of functional approaches to reduce soft tissue artefact and identify joint centres and axes, the lengths of the femora and tibiae were determined to assess the inter-day and inter-observer reliability, and compared against a standard generic regression approach. The results indicate that the OSSCA was repeatable and reproducible (ICC lowest bound 0.87), but also provided an improvement over the regression approach (ICC lowest bound 0.69). Furthermore, the analysis of variance revealed a statistically significant variance for the factor “observers” (p < 0.01; low-reproducibility) when using the regression approach for determining the femoral lengths. Here, this non-invasive, rapid and robust approach has been demonstrated to allow the repeatable and reproducible identification of skeletal landmarks, which is insensitive to marker placement and measurement session. The reliability of the OSSCA thus allows its application in clinical studies for reducing the uncertainty of approach-induced systematic errors.
Functional gait analysis, SARA, SCoRE, OCST, OSSCA
0966-6362
231-236
Taylor, W.R.
4f1cd2b0-4963-4b10-bbde-da586c069e77
Kornaropoulos, E.I.
96a58349-6383-4780-92a2-5d60c0edbe58
Duda, G.N.
32d09622-34ad-49dd-8314-3f61c99a764e
Kratzenstein, S.
d155b39d-710e-40a6-a29f-5c17a5bdb103
Ehrig, R.M.
23abc0d9-47bd-427e-8edf-f334e0a87799
Arampatzis, A.
c9790cb1-9d04-4827-8366-fd83ff76ecb3
Heller, M.O.
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Taylor, W.R.
4f1cd2b0-4963-4b10-bbde-da586c069e77
Kornaropoulos, E.I.
96a58349-6383-4780-92a2-5d60c0edbe58
Duda, G.N.
32d09622-34ad-49dd-8314-3f61c99a764e
Kratzenstein, S.
d155b39d-710e-40a6-a29f-5c17a5bdb103
Ehrig, R.M.
23abc0d9-47bd-427e-8edf-f334e0a87799
Arampatzis, A.
c9790cb1-9d04-4827-8366-fd83ff76ecb3
Heller, M.O.
3da19d2a-f34d-4ff1-8a34-9b5a7e695829

Taylor, W.R., Kornaropoulos, E.I., Duda, G.N., Kratzenstein, S., Ehrig, R.M., Arampatzis, A. and Heller, M.O. (2010) Repeatability and reproducibility of OSSCA: a functional approach for assessing the kinematics of the lower limb. Gait & Posture, 32 (2), 231-236. (doi:10.1016/j.gaitpost.2010.05.005). (PMID:20547061)

Record type: Article

Abstract

Marker-based gait analysis of the lower limb that uses assumptions of generic anatomical morphology can be susceptible to errors, particularly in subjects with high levels of soft tissue coverage. We hypothesize that a functional approach for assessing skeletal kinematics, based on the application of techniques to reduce soft tissue artefact and functionally identify joint centres and axes, can more reliably (repeatably and reproducibly) assess the skeletal kinematics than a standard generic regression approach. Six healthy adults each performed 100 repetitions of a standardized motion, measured on four different days and by five different observers. Using OSSCA, a combination of functional approaches to reduce soft tissue artefact and identify joint centres and axes, the lengths of the femora and tibiae were determined to assess the inter-day and inter-observer reliability, and compared against a standard generic regression approach. The results indicate that the OSSCA was repeatable and reproducible (ICC lowest bound 0.87), but also provided an improvement over the regression approach (ICC lowest bound 0.69). Furthermore, the analysis of variance revealed a statistically significant variance for the factor “observers” (p < 0.01; low-reproducibility) when using the regression approach for determining the femoral lengths. Here, this non-invasive, rapid and robust approach has been demonstrated to allow the repeatable and reproducible identification of skeletal landmarks, which is insensitive to marker placement and measurement session. The reliability of the OSSCA thus allows its application in clinical studies for reducing the uncertainty of approach-induced systematic errors.

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More information

e-pub ahead of print date: 23 May 2010
Keywords: Functional gait analysis, SARA, SCoRE, OCST, OSSCA
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 348528
URI: http://eprints.soton.ac.uk/id/eprint/348528
ISSN: 0966-6362
PURE UUID: a1b5bb90-21ad-410e-ad9e-f5620cac5594
ORCID for M.O. Heller: ORCID iD orcid.org/0000-0002-7879-1135

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Date deposited: 14 Feb 2013 15:25
Last modified: 15 Mar 2024 03:43

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Contributors

Author: W.R. Taylor
Author: E.I. Kornaropoulos
Author: G.N. Duda
Author: S. Kratzenstein
Author: R.M. Ehrig
Author: A. Arampatzis
Author: M.O. Heller ORCID iD

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