We sought to determine the effects of head rotation, lateral neck flexion, and traction force on brachial plexus (BP) nerve strain, specifically at C5-C6 (Erb’s point), and C7, C8, and T1 roots in a multi-“filament” 3D model of the fetal BP. Using our constructed simulator and a tailored data acquisition system, strain readings were recorded and accurate to within <2%. Using our model and a position-sensing system, controlled loads and deformations were applied to a fetal head attached to a flexible spine. For each simulation, we measured BP strain at Erb’s point, and C7, C8, and T1 roots. Increasing total traction force increases strain in the upper and middle nerves (Erb’s point, C7, and C8). Lateral neck flexion produces the most strain (up to 25.4±6.6% in Erb’s point with 4.5 kg (10 lbs) of traction), with concomitant head rotation magnifying strain levels by up to a factor of 1.7. Increasing head rotation and lateral neck flexion increases the strain in the lower nerve roots more than in the upper roots. in general, upper nerves undergo double the strain of lower nerves. Direct axial traction has the least effect, with 4.5 kg of traction producing a peak strain of 3.6±2.5% at Erb’s point. BP strain can be reduced at Erb’s point, C7, and C8 by maintaining neutral alignment between the head and trunk prior to applying traction, which should be minimized.
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ASME 2007 2nd Frontiers in Biomedical Devices Conference
June 7–8, 2007
Irvine, California, USA
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4266-5
PROCEEDINGS PAPER
Measuring Neck Nerve Strain: An Experimental Investigation
Tara L. Johnson,
Tara L. Johnson
Johns Hopkins University, Baltimore, MD
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Vanessa LaPointe,
Vanessa LaPointe
Johns Hopkins University, Baltimore, MD
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Artin A. Shoukas,
Artin A. Shoukas
Johns Hopkins University, Baltimore, MD
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Edith D. Gurewitsch,
Edith D. Gurewitsch
Johns Hopkins University, Baltimore, MD
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Robert H. Allen
Robert H. Allen
Johns Hopkins University, Baltimore, MD
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Tara L. Johnson
Johns Hopkins University, Baltimore, MD
Vanessa LaPointe
Johns Hopkins University, Baltimore, MD
Artin A. Shoukas
Johns Hopkins University, Baltimore, MD
Edith D. Gurewitsch
Johns Hopkins University, Baltimore, MD
Robert H. Allen
Johns Hopkins University, Baltimore, MD
Paper No:
BioMed2007-38073, pp. 15-16; 2 pages
Published Online:
February 24, 2009
Citation
Johnson, TL, LaPointe, V, Shoukas, AA, Gurewitsch, ED, & Allen, RH. "Measuring Neck Nerve Strain: An Experimental Investigation." Proceedings of the ASME 2007 2nd Frontiers in Biomedical Devices Conference. ASME 2007 2nd Frontiers in Biomedical Devices. Irvine, California, USA. June 7–8, 2007. pp. 15-16. ASME. https://doi.org/10.1115/BioMed2007-38073
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