Which is the best-suited landmark to assess the thoracic orientation?
Autor: | Thomas Zander, Hendrik Schmidt, Fumin Pan |
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Rok vydání: | 2020 |
Předmět: |
Adult
Male Thorax Computer science 0206 medical engineering Biomedical Engineering Biophysics Walking 02 engineering and technology Sitting medicine.disease_cause Motion capture Thoracic Vertebrae 03 medical and health sciences 0302 clinical medicine Jumping medicine Humans Orthopedics and Sports Medicine Computer vision Observational error Landmark business.industry Orientation (computer vision) Rehabilitation Middle Aged 020601 biomedical engineering Biomechanical Phenomena Breathing Female Artificial intelligence Artifacts business 030217 neurology & neurosurgery |
Zdroj: | Journal of Biomechanics. 102:109545 |
ISSN: | 0021-9290 |
Popis: | Several skin surface-based techniques exist to non-invasively determine the spinal kinematics. However, the accuracy of these techniques is limited by soft-tissue artefacts. Furthermore, structures like the thorax are frequently assumed to be rigid but display considerable mobility within itself. This study aimed to quantify the accuracy at different thoracic landmarks for measuring mobility in healthy individuals during different activities to provide a recommendation for the best suited measurement location. The locations of 29 landmarks were continuously captured on 19 individuals (age: 25-59 years) during sitting, standing, walking, jumping, intra-thoracic motions, and different breathing depths using reflective markers. Marker triplets were used at every landmark to calculate their orientations by first backtracking the rigid-body motion (RBM) of the thorax in general, and subsequently calculating the RBM of each rigid marker triplet. Of the latter, the maximum axis angle for each exercise was statistically evaluated. Landmarks at the middle of the clavicles displayed the largest overall errors (approximately 90° during worst case scenario). However, the variability of errors among the investigated exercises was large. Landmarks at the cranial sternal region (particularly at the "Louis angle") and at the T3 spinous process showed the smallest errors for all subjects and tasks (e.g.,5° and11°, respectively, during normal breathing). When only one sensor is to be used, it is recommended to use the cranial sternal region to assess the thoracic orientation. Study results highly sensitive to thoracic orientation should be considered with care or performed using more appropriate methods. |
Databáze: | OpenAIRE |
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