NCT01342588

Accuracy of Lumbar Pedicle Screw Placement Assisted With Continuous Pulse-train Stimulation

Accuracy of Lumbar Pedicle Screw Placement Assisted With Continuous Pulse-train Stimulation During Track Creation and Screw Insertion

• Status: Unknown
• Phase: N/A
• Study type: Interventional
• Enrollment: 60 (estimated)
• Sponsor: American British Cowdray Medical Center · Academic / Other
• Sex: All
• Age: 18 Years – 70 Years
• Healthy volunteers: Not accepted

Summary

The purpose of this study is to establish the accuracy of pedicle positioning using continuous electrical pulse during screwing. Additionally, the investigators evaluate if this maneuver can prevent neurological injury during track creation and screwing in lumbar and thoracic spine instrumentation surgery

Detailed description

Pedicle screw instrumentation as part of spine surgery is a recurrent technique used for most of spine surgeons. Since its description by Boucher in 1959 and its popularization later by Roy-Camille, has been considered a technique that demands great anatomy knowledge and some grade of expertise. Even in experienced hands the misplacement of pedicle screws could have an incidence of 10-40% (average of 20%). Medially misplacements during track creation and screw insertion are the most feared complications, because the anatomic relationship between medial pedicle wall and neural structures. The first attempt to use continuous electrical stimulation during pedicle track creation and screw insertion was communicated in 1997 by Welch WC, et al. In that study they used the bone impedance as a direct measurement of pedicle wall integrity; unfortunately they used inhaled anesthetics and assessed the final screw position with plain X-rays. They reported a sensibility and specificity of 98% and 99% respectively. The great limitation for this study is its assessment of screw accuracy performed by plain X-rays, now a days the best way to do it is with computed tomography (CT). After the Welch report, a couple of studies more have used similar techniques in the thoracic spine trying to avoid neurological injuries during pedicle screw insertion, but none described the use of continuous train pulses during screwing. The present study pretends to evaluate the final accuracy and trans-operative usefulness of the pulse train stimulation during track creation and screw insertion using intra venous anesthetic agents and CT scans to assess the integrity of pedicle walls

Conditions

• Spine Pedicle Screw Placement

Interventions

Type	Name	Description
PROCEDURE	Electric pulse train stimulation	Electric pulse train stimulation of regular probes and screw drivers used in track creation and screw placement Using a standard neurophysiological work station, a series of square wave pulses will be delivered through standard probes and screw drivers using an alligator clip during pedicle probing and screw insertion (4 Hz for 50-200 μsec at 10-30 μAmp)

Timeline

• Start date: 2011-01-01
• Primary completion: 2012-04-01
• Completion: 2012-05-01
• First posted: 2011-04-27
• Last updated: 2011-04-27

Locations

1 site across 1 country: Mexico