An optimization-based method for prediction of lumbar spine segmental kinematics from the measurements of thorax and pelvic kinematics

Summary Given measurement difficulties, earlier modeling studies have often used some constant ratios to predict lumbar segmental kinematics from measurements of total lumbar kinematics. Recent imaging studies suggested distribution of lumbar kinematics across its vertebrae changes with trunk rotati...

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Vydáno v:International journal for numerical methods in biomedical engineering Ročník 31; číslo 12
Hlavní autoři: Shojaei, I., Arjmand, N., Bazrgari, B.
Médium: Journal Article
Jazyk:angličtina
Vydáno: England Blackwell Publishing Ltd 01.12.2015
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Témata:
Algorithms
Biomechanical Phenomena
Compressive Strength
Humans
Image Processing, Computer-Assisted - methods
kinematics-driven method
lumbar spine
Lumbar Vertebrae - physiology
Models, Biological
Muscle, Skeletal - physiology
optimization-based method
Pelvis - physiology
Range of Motion, Articular
Reproducibility of Results
spinal loads
Thorax - physiology
Weight-Bearing
lumbar spine
spinal loads
optimization-based method
kinematics-driven method
ISSN:2040-7939, 2040-7947, 2040-7947
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Shrnutí:Summary Given measurement difficulties, earlier modeling studies have often used some constant ratios to predict lumbar segmental kinematics from measurements of total lumbar kinematics. Recent imaging studies suggested distribution of lumbar kinematics across its vertebrae changes with trunk rotation, lumbar posture, and presence of load. An optimization‐based method is presented and validated in this study to predict segmental kinematics from measured total lumbar kinematics. Specifically, a kinematics‐driven biomechanical model of the spine is used in a heuristic optimization procedure to obtain a set of segmental kinematics that, when prescribed to the model, were associated with the minimum value for the sum of squared predicted muscle stresses across all the lower back muscles. Furthermore, spinal loads estimated using the predicted kinematics by the present method were compared with those estimated using constant ratios. Predicted segmental kinematics were in good agreement with those obtained by imaging with an average error of ~10%. Compared with those obtained using constant ratios, predicted spinal loads using segmental kinematics obtained here were in general smaller. In conclusion, the proposed method offers an alternative tool for improving model‐based estimates of spinal loads where image‐based measurement of lumbar kinematics is not feasible. Copyright © 2015 John Wiley & Sons, Ltd. Distribution of lumbar kinematics across its vertebrae changes with task, load, and posture, therefore raising a concern related to such distribution using constant ratios. A biomechanical model of spine is used in an optimization procedure to predict a distribution of lumbar segmental kinematics, which is associated with the minimum level of stress among all trunk muscles. Predicted kinematics were in good agreement with those obtained by imaging, and spinal loads were smaller than those obtained by constant ratios.
Bibliografie:istex:D08092E8DB98FC62315B68D69755C6339E8F4985
ArticleID:CNM2729
ark:/67375/WNG-4JBBXR1S-W
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:2040-7939
2040-7947
2040-7947
DOI:10.1002/cnm.2729