Effective marker placement for functional identification of the centre of rotation at the hip
| Autor: | Berry M. Pöpplau, Stefan Kratzenstein, Evgenios I. Kornaropoulos, Markus O. Heller, Rainald Ehrig, William R. Taylor |
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| Rok vydání: | 2012 |
| Předmět: |
Adult
Male Accuracy and precision Motion analysis Rotation Functional identification 0206 medical engineering Biophysics 02 engineering and technology Kinematics Sampling Studies Young Adult 03 medical and health sciences Centre of rotation 0302 clinical medicine Reference Values medicine Humans Orthopedics and Sports Medicine Gravity Sensing Range of Motion Articular Pelvis Orthodontics business.industry Rehabilitation Reproducibility of Results Soft tissue 030229 sport sciences Anatomy 020601 biomedical engineering Biomechanical Phenomena medicine.anatomical_structure Skin marker Hip Joint Anatomic Landmarks business |
| Zdroj: | Gait & Posture |
| ISSN: | 0966-6362 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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