Instantaneous Centers of Rotation for Lumbar Segmental Extension In Vivo

Details

• Personal Author:
  Aiyangar A ; Anderst W ; Zhang X ; Zheng L
• Description:
  The study aimed to map instantaneous centers of rotation (ICRs) of lumbar motion segments during a functional lifting task and examine differences across segments and variations caused by magnitude of weight lifted. Eleven healthy participants lifted loads of three different magnitudes (4.5, 9, and 13.5 kg) from a trunk-flexed (approximately 75 degrees) to an upright position, while being imaged by a dynamic stereo X-ray (DSX) system. Tracked lumbar vertebral (L2-S1) motion data were processed into highly accurate 6DOF intervertebral (L2L3, L3L4, L4L5, L5S1) kinematics. ICRs were computed using the finite helical axis method. Effects of segment level and load magnitude on the anterior-posterior (AP) and superior-inferior (SI) ICR migration ranges were assessed with a mixed-effects model. Further, ICRs were averaged to a single center of rotation (COR) to assess segment-specific differences in COR AP- and SI-coordinates. The AP range was found to be significantly larger for L2L3 compared to L3L4 (p=0.02), L4L5 and L5S1 (p <0.001). Average ICR SI location was relatively higher - near the superior endplate of the inferior vertebra - for L4L5 and L5SI compared to L2L3 and L3L4 (p ≤ 0.001) - located between the mid-transverse plane and superior endplate of the inferior vertebra - but differences were not significant amongst themselves (p >0.9). Load magnitude had a significant effect only on the SI component of ICR migration range (13.5 kg >9 kg and 4.5 kg; p=0.049 and 0.017 respectively). The reported segment-specific ICR data exemplify improved input parameters for lumbar spine biomechanical models and design of disc replacements, and base-line references for potential diagnostic applications. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Musculoskeletal System Nervous System Occupational Health Safety
• Keywords:
  Author Keywords: Lumbar Spine Biomechanics Body Mechanics Body Regions Dynamic Stereo X-ray Humans Imaging Techniques Instantaneous Center Of Rotation In Vivo Study Kinesiology Lifting Lifting Task Manual Lifting Mathematical Models Models Motion Studies Musculoskeletal System Physiological Effects Physiological Stress Physiology Spinal Cord Statistical Analysis Vertebral Motion Weight Factors Weight Measurement X-rays

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• ISSN:
  0021-9290
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  113-121
• Volume:
  52
• NIOSHTIC Number:
  nn:20051525
• Citation:
  J Biomech 2017 Feb; 52:113-121
• Contact Point Address:
  Xudong Zhang, Department of Orthopaedic Surgery, Department of Bioengineering, and Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15203, USA
• Email:
  xuz9@pitt.edu
• Federal Fiscal Year:
  2017
• NORA Priority Area:
  Construction ; Manufacturing
• Performing Organization:
  University of Pittsburgh at Pittsburgh
• Peer Reviewed:
  True
• Start Date:
  20110901
• Source Full Name:
  Journal of Biomechanics
• End Date:
  20140831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:3e994636741f8495ce597e0fcd7e266cda2fcccb4b8c92851e8218de884fcca78b1383c60f09267368aa9d882be54a4bbf37eb75b2d1f3960c14d53166b879fe
• Download URL:
  https://stacks.cdc.gov/view/cdc/211431/cdc_211431_DS1.pdf
• File Type:
  [PDF - 1.57 MB ]