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Index to Chiropractic Literature
Index to Chiropractic Literature
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Tuesday, October 15, 2019
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ID 24420
  Title Development of a linked segment model to derive patient low back reaction forces and moments during high-velocity low-amplitude spinal manipulation
URL http://www.jmptonline.org/article/S0161-4754%2816%2900056-7/fulltext
Journal J Manipulative Physiol Ther. 2016 Mar-Apr;39(3):176-184
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Peer Review Yes
Publication Type Article
Abstract/Notes

Objective: The purpose of this paper is to present the experimental setup, the development, and implementation of a new scalable model capable of efficiently handling data required to determine low back kinetics during high-velocity low-amplitude spinal manipulation (HVLA-SM).

Methods: The model was implemented in Visual3D software. All contact forces and moments between the patient and the external environment (2 clinician hand contact forces, 1 contact force between the patient and the treatment table), the patient upper body kinematics, and inertial properties were used as input. Spine kinetics and kinematics were determined from a single HVLA-SM applied to one healthy participant in a right side-lying posture to demonstrate the model’s utility. The net applied force was used to separate the spine kinetic and kinematic time-series data from the HVLA-SM into preload as well as early and late impulse phases.

Results: Time-series data obtained from the HVLA-SM procedure showed that the participant’s spine underwent left axial rotation, combined with extension, and a reduction in left lateral bending during the procedure. All components of the reaction force, as well as the axial twist and flexion/extension reaction moments demonstrated a sinusoidal pattern during the early and late impulse phases. During the early impulse phase, the participant’s spine experienced a leftward axial twisting moment of 37.0 Nm followed by a rightward moment of −45.8 Nm. The lateral bend reaction moment exhibited a bimodal pattern during the early and late impulse phases.

Conclusion: This model was the first attempt to directly measure all contact forces acting on the participant/patient’s upper body, and integrate them with spine kinematic data to determine patient low back reaction forces and moments during HVLA-SM in a side-lying posture. Advantages of this model include the brevity of data collection (<1 hour), and adaptability for different patient anthropometries and clinician-patient contacts.

This abstract is reproduced with the permission of the publisher; click on the above link for free full text.


 

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