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Effective marker placement for functional identification of the centre of rotation at the hip

Effective marker placement for functional identification of the centre of rotation at the hip
Effective marker placement for functional identification of the centre of rotation at the hip
The accuracy and precision of quantifying musculoskeletal kinematics, and particularly determining the centre of rotation (CoR) at the hip joint, using skin marker based motion analysis is limited by soft tissue artefact (STA). We posed the question of whether the contribution of individual markers towards improving the precision of the functional joint centre using marker based methods could be assessed, and then utilised to allow effective marker placement for determination of the CoR at the hip. Sixty-three retro-reflective skin markers were placed to encompass the thighs of seven healthy subjects, together with a set of sixteen markers on the pelvis. The weighted optimal common shape technique (wOCST) was then applied to determine the weighting, or importance, of each marker for identifying the centre of rotation at the hip. The markers with the highest weightings over all subjects and measurements were determined that identified the HJC with the highest precision. The use of six markers in selected regions (two anterior, two lateral and two posterior) allowed the HJC to be determined with a similar precision to the complete set of 63 markers, with the determined regions predominantly distant from the hip joint, excluding areas associated with the bellies of large muscles and therefore large motion artefact from muscle activity. The novel approach presented here allows an understanding of each marker's contribution towards a precise joint determination, and therefore enables the targeted placement of markers for reliable assessment of musculoskeletal kinematics.
Functional gait analysis Soft tissue artefact Centre of rotation SCoRE wOCST
0966-6362
482-486
Kratzenstein, S.
d155b39d-710e-40a6-a29f-5c17a5bdb103
Kornaropoulos, E. I.
655eb513-a612-401c-ac25-90bdc094967a
Ehrig, R. M.
77086848-955c-4fdb-b2f6-96e894d3c964
Heller, M. O.
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Pöpplau, B. M.
1367c19e-e696-4831-85cb-1914ab284c52
Taylor, W. R.
c56f0d4f-7a07-41cd-9312-06ee84a18ec6
Kratzenstein, S.
d155b39d-710e-40a6-a29f-5c17a5bdb103
Kornaropoulos, E. I.
655eb513-a612-401c-ac25-90bdc094967a
Ehrig, R. M.
77086848-955c-4fdb-b2f6-96e894d3c964
Heller, M. O.
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Pöpplau, B. M.
1367c19e-e696-4831-85cb-1914ab284c52
Taylor, W. R.
c56f0d4f-7a07-41cd-9312-06ee84a18ec6

Kratzenstein, S., Kornaropoulos, E. I., Ehrig, R. M., Heller, M. O., Pöpplau, B. M. and Taylor, W. R. (2012) Effective marker placement for functional identification of the centre of rotation at the hip. Gait & Posture, 36 (3), 482-486. (doi:10.1016/j.gaitpost.2012.04.011). (PMID:22672896)

Record type: Article

Abstract

The accuracy and precision of quantifying musculoskeletal kinematics, and particularly determining the centre of rotation (CoR) at the hip joint, using skin marker based motion analysis is limited by soft tissue artefact (STA). We posed the question of whether the contribution of individual markers towards improving the precision of the functional joint centre using marker based methods could be assessed, and then utilised to allow effective marker placement for determination of the CoR at the hip. Sixty-three retro-reflective skin markers were placed to encompass the thighs of seven healthy subjects, together with a set of sixteen markers on the pelvis. The weighted optimal common shape technique (wOCST) was then applied to determine the weighting, or importance, of each marker for identifying the centre of rotation at the hip. The markers with the highest weightings over all subjects and measurements were determined that identified the HJC with the highest precision. The use of six markers in selected regions (two anterior, two lateral and two posterior) allowed the HJC to be determined with a similar precision to the complete set of 63 markers, with the determined regions predominantly distant from the hip joint, excluding areas associated with the bellies of large muscles and therefore large motion artefact from muscle activity. The novel approach presented here allows an understanding of each marker's contribution towards a precise joint determination, and therefore enables the targeted placement of markers for reliable assessment of musculoskeletal kinematics.

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More information

Published date: 2012
Keywords: Functional gait analysis Soft tissue artefact Centre of rotation SCoRE wOCST
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 348536
URI: https://eprints.soton.ac.uk/id/eprint/348536
ISSN: 0966-6362
PURE UUID: 02c62ccc-f162-453c-8311-18e04b04be3f
ORCID for M. O. Heller: ORCID iD orcid.org/0000-0002-7879-1135

Catalogue record

Date deposited: 14 Feb 2013 15:13
Last modified: 20 Jul 2019 00:41

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Contributors

Author: S. Kratzenstein
Author: E. I. Kornaropoulos
Author: R. M. Ehrig
Author: M. O. Heller ORCID iD
Author: B. M. Pöpplau
Author: W. R. Taylor

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