The contribution of anulus fibers to torque resistance

Spine
M KrismerW Rabl

Abstract

Anulus fibers of the intervertebral disc oriented in one direction were dissected, and oppositely directed fibers were left intact as a result of a newly developed dissection method. Motion segments were dissected by this way, and motion segments after bilateral facetectomy were loaded in torsion and compared with each other. To assess the contribution of facets and anulus fibers to torque resistance. Mathematical models predict that torsional stress is transmitted only to those collagene fibers of the anulus that are angled in the direction of the applied torque. Torsion and forward bending or torsion and compression are likely to cause anulus damage. No experimental study that we are aware of has confirmed that anulus fibers are the main structure to resist against torque. Pure axial rotation moments were applied on 12 lumbar motion segments. The six components of motion were recorded. Six motion segments were investigated intact after dissection of anulus fibers directed in one direction and after additional bilateral facetectomy. In six motion segments, bilateral facetectomy was performed before anulus dissection. With the application of an axial rotation moment of 8.5 Nm to the left, axial rotation increased 2 degrees afte...Continue Reading

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Citations

Dec 17, 2010·Archives of Orthopaedic and Trauma Surgery·Nuzhao YaoYonghua Liu
May 11, 2004·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Hannes HaberlL-P Nolte
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Sep 29, 2009·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Lizu XiaoDeren Zhang
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