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Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 397 - 397
1 Sep 2012
Sánchez Ruas JJ Burgos Flores J Aranda Romero F Del Olmo Hernández T Piza Vallespir G De Blas G Montes E Caballero García A Barriga Martín A Collazo J Hevia E Correa Gorospe C Barrios C
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Objectives

To determine the limits of spinal displacement before the onset of neurophysiological changes during spinal surgery. Assessing if the type of force applied or the section of the adjacent nerve roots increases the tolerance to displacement.

Methods

Experimental study in 21 domestic pigs. Three groups were established according to the displacing force applied to the cord: separation (group 1, n=7), root stump pull (group2, n=7) and torque (group3, n=7). Successive records of cord-to-cord motor evoked potential were obtained. The displacing force was removed immediately when neurophysiological changes observed. The experiment was repeated after sectioning the adjacent nerve roots.