Advertisement for orthosearch.org.uk
Results 1 - 2 of 2
Results per page:
Applied filters
Include Proceedings
Dates
Year From

Year To
Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 395 - 395
1 Sep 2012
Sánchez Ruas JJ Burgos Flores J Aranda Romero F Del Olmo Hernández T De Blas G Barrios C Hevia E Regidor I Correa Gorospe C Ruíz Ibán M Díaz Heredia J López Mondéjar J Berrendero L
Full Access

Introduction

A new triggered electromyography test for detection of stimulus diffusion to intercostal muscles of the contralateral side during thoracic pedicle screw placement was evaluated. Experimental research was carried out in order to determine if, using this test, neural contact at different aspects of the spinal cord and nerve roots could be discriminated.

Methods

Nine industrial pigs (60–75 kg) had 108 pedicle screws placed bilaterally in the thoracic spine (T8–T13). Neural structures were stimulated under direct vision at different anatomic locations from T9 to T12. Recording electrodes were placed over the right and left intercostal muscles. Increasing intensity of the stimulus was applied until muscle response was detected at the contralateral side (diffusion phenomenon). After this first experiment, the thoracic spine was instrumented. Screws were placed in the pedicle in two different positions, the anatomic intrapedicular location and with purposeful contact with the neural elements.


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
Full Access

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.