Gravity center estimation for evaluation of standing whole body compensation using virtual barycentremetry based on biplanar slot-scanning stereoradiography - validation by simultaneous force plate measurement
Abstract Background Whole body standing alignment (WBSA) in terms of biomechanics can be evaluated accurately only by referring the gravity line (GL) which lies on the gravity center (GC). Here, we introduce a method for estimating GL and simultaneous WBSA measurement using the EOS® imaging system a...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
BMC
2022-01-01
|
| Series: | BMC Musculoskeletal Disorders |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s12891-021-04948-5 |
| _version_ | 1798034676531593216 |
|---|---|
| author | Kazuhiro Hasegawa Celia Amabile Matthieu Nesme Jean Dubousset |
| author_facet | Kazuhiro Hasegawa Celia Amabile Matthieu Nesme Jean Dubousset |
| author_sort | Kazuhiro Hasegawa |
| collection | DOAJ |
| description | Abstract Background Whole body standing alignment (WBSA) in terms of biomechanics can be evaluated accurately only by referring the gravity line (GL) which lies on the gravity center (GC). Here, we introduce a method for estimating GL and simultaneous WBSA measurement using the EOS® imaging system and report on the reproducibility and reliability of the method. Methods A 3-dimensional (3D) avatar to estimate GC was created following three steps: 3D reconstruction of the bone based on EOS images; deformation into a generic morphotype (MakeHuman statistical model) before density integration with 3D rasterization of the full body into 1-mm3 voxels (the content of each voxel is considered homogeneous); computation of the density of all the voxels provides the center of mass, which can be projected onto the floor as the GC of the full body, providing the GL in relation to the WBSA. The repeatability, reproducibility, and accuracy of the estimated GC and body weight of the avatar were compared with clinical estimation using a force plate in healthy volunteers and patients with degenerative and deformative diseases. Results Statistical analyses of the data revealed that the repeatability and reproducibility of the estimation was high with intra-rater and inter-rater intraclass correlation coefficient. ≥0.999. The coordinate values of the GC and body weight estimation did not differ significantly between the avatar and force plate measurements, demonstrating the high accuracy of the method. Conclusion This new method of estimating GC and WBSA is reliable and accurate. Application of this method could allow clinicians to quickly and qualitatively evaluate WBSA with GL with various spinal malalignment pathologies. |
| first_indexed | 2024-04-11T20:47:35Z |
| format | Article |
| id | doaj.art-cf11038e15ac47dda8108c9d0dfd9e05 |
| institution | Directory Open Access Journal |
| issn | 1471-2474 |
| language | English |
| last_indexed | 2024-04-11T20:47:35Z |
| publishDate | 2022-01-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Musculoskeletal Disorders |
| spelling | doaj.art-cf11038e15ac47dda8108c9d0dfd9e052022-12-22T04:03:58ZengBMCBMC Musculoskeletal Disorders1471-24742022-01-0123111310.1186/s12891-021-04948-5Gravity center estimation for evaluation of standing whole body compensation using virtual barycentremetry based on biplanar slot-scanning stereoradiography - validation by simultaneous force plate measurementKazuhiro Hasegawa0Celia Amabile1Matthieu Nesme2Jean Dubousset3Niigata Spine Surgery CenterEOS imagingAnatoScope, Montpellier HeadquarterAcadémie Nationale de MédecineAbstract Background Whole body standing alignment (WBSA) in terms of biomechanics can be evaluated accurately only by referring the gravity line (GL) which lies on the gravity center (GC). Here, we introduce a method for estimating GL and simultaneous WBSA measurement using the EOS® imaging system and report on the reproducibility and reliability of the method. Methods A 3-dimensional (3D) avatar to estimate GC was created following three steps: 3D reconstruction of the bone based on EOS images; deformation into a generic morphotype (MakeHuman statistical model) before density integration with 3D rasterization of the full body into 1-mm3 voxels (the content of each voxel is considered homogeneous); computation of the density of all the voxels provides the center of mass, which can be projected onto the floor as the GC of the full body, providing the GL in relation to the WBSA. The repeatability, reproducibility, and accuracy of the estimated GC and body weight of the avatar were compared with clinical estimation using a force plate in healthy volunteers and patients with degenerative and deformative diseases. Results Statistical analyses of the data revealed that the repeatability and reproducibility of the estimation was high with intra-rater and inter-rater intraclass correlation coefficient. ≥0.999. The coordinate values of the GC and body weight estimation did not differ significantly between the avatar and force plate measurements, demonstrating the high accuracy of the method. Conclusion This new method of estimating GC and WBSA is reliable and accurate. Application of this method could allow clinicians to quickly and qualitatively evaluate WBSA with GL with various spinal malalignment pathologies.https://doi.org/10.1186/s12891-021-04948-5BarycentremetryEOS®systemForce plate measurementGravity centerWhole body standing alignment |
| spellingShingle | Kazuhiro Hasegawa Celia Amabile Matthieu Nesme Jean Dubousset Gravity center estimation for evaluation of standing whole body compensation using virtual barycentremetry based on biplanar slot-scanning stereoradiography - validation by simultaneous force plate measurement BMC Musculoskeletal Disorders Barycentremetry EOS®system Force plate measurement Gravity center Whole body standing alignment |
| title | Gravity center estimation for evaluation of standing whole body compensation using virtual barycentremetry based on biplanar slot-scanning stereoradiography - validation by simultaneous force plate measurement |
| title_full | Gravity center estimation for evaluation of standing whole body compensation using virtual barycentremetry based on biplanar slot-scanning stereoradiography - validation by simultaneous force plate measurement |
| title_fullStr | Gravity center estimation for evaluation of standing whole body compensation using virtual barycentremetry based on biplanar slot-scanning stereoradiography - validation by simultaneous force plate measurement |
| title_full_unstemmed | Gravity center estimation for evaluation of standing whole body compensation using virtual barycentremetry based on biplanar slot-scanning stereoradiography - validation by simultaneous force plate measurement |
| title_short | Gravity center estimation for evaluation of standing whole body compensation using virtual barycentremetry based on biplanar slot-scanning stereoradiography - validation by simultaneous force plate measurement |
| title_sort | gravity center estimation for evaluation of standing whole body compensation using virtual barycentremetry based on biplanar slot scanning stereoradiography validation by simultaneous force plate measurement |
| topic | Barycentremetry EOS®system Force plate measurement Gravity center Whole body standing alignment |
| url | https://doi.org/10.1186/s12891-021-04948-5 |
| work_keys_str_mv | AT kazuhirohasegawa gravitycenterestimationforevaluationofstandingwholebodycompensationusingvirtualbarycentremetrybasedonbiplanarslotscanningstereoradiographyvalidationbysimultaneousforceplatemeasurement AT celiaamabile gravitycenterestimationforevaluationofstandingwholebodycompensationusingvirtualbarycentremetrybasedonbiplanarslotscanningstereoradiographyvalidationbysimultaneousforceplatemeasurement AT matthieunesme gravitycenterestimationforevaluationofstandingwholebodycompensationusingvirtualbarycentremetrybasedonbiplanarslotscanningstereoradiographyvalidationbysimultaneousforceplatemeasurement AT jeandubousset gravitycenterestimationforevaluationofstandingwholebodycompensationusingvirtualbarycentremetrybasedonbiplanarslotscanningstereoradiographyvalidationbysimultaneousforceplatemeasurement |