Advertisement for orthosearch.org.uk
Results 1 - 4 of 4
Results per page:
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.


Orthopaedic Proceedings
Vol. 87-B, Issue SUPP_I | Pages 84 - 84
1 Mar 2005
Aguado HJ Ruiz-Ibán MA Burgos-Flores J Díaz-Heredia J
Full Access

Introduction and purpose: The relationship between congenital heart disease and the increased prevalence of scoliosis is well known, although the same cannot be said about the etiology of scoliosis in these patients. Although thoracotomy is often associated to scoliosis, median sternotomy has so far not been identified as an etiological agent. he purpose of the study is to determine if patients with congenital heart disease who are subjected to a median sternotomy show a higher prevalence of spine deformities.

Materials and methods: A retrospective review is made of patients operated on for congenital heart disease through median sternotomy before the age of 8, assessing the development of spine deformities. Simple chest radiographs of 128 patients were studied once they reached skeletal maturity and it was observed that they presented no spinal or costal deformities before surgery.

Results: The prevalence of scoliosis was 34.3%; 16 of these patients (12.5%) had curves of more than 20° and 33 (25.8%) had thoracic kyphosis of less than 20°. Patients operated on before the age of 18 months had a significantly higher risk to develop scoliosis as compared with those treated later (odds ratio: 3.48; p=0.016). The development of scoliosis was not related with the type of cardiac malformation present.

Conclusions: There is a high prevalence of scoliosis in patients subjected to a median sternotomy for a congenital heart pathology. The prevalence of scoliosis increases in patients operated on at younger ages.


The Journal of Bone & Joint Surgery British Volume
Vol. 77-B, Issue 2 | Pages 262 - 266
1 Mar 1995
Gonzalez-Herranz P Burgos-Flores J Rapariz J Lopez-Mondejar J Ocete J Amaya S

We have studied the medium- and long-term effects of femoral intramedullary nailing in 34 children. There was a high incidence of abnormality at the proximal end of the femur, including coxa valga, arrest of growth of the greater trochanter and thinning of the neck of the femur, because of damage to the trochanterocervical growth plate. These disorders affected 30% of the patients, mostly under the age of 13 years (p < 0.05), and were seen more frequently when the nail had been introduced through the piriform fossa. Other factors, such as the side, gender, aetiology, proximal or retrograde insertion, the size of nail and removal of the implant did not influence the result. We recommend that in patients under the age of 13 years other methods of management should be used to avoid damage to the growth plate.