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KMID : 1145220210180010117
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Neurospine
2021 Volume.18 No. 1 p.117 ~ p.125
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Development of Neuromonitoring Pedicle Screw - Results of Electrical Resistance and Neurophysiologic Test in Pig Model
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Bang Woo-Seok
Park Jong-Hoo
Kim Kyoung-Tae
Cho Dae-Chul
Riew K. Daniel
Kim Du-Hwan
Han In-Bo
Hyun Seung-Jae
Yoon Do-Heum
Kim Young-Baeg
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Abstract
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Objective: To analyze the electrical resistance of a newly developed neuromonitoring pedicle screw (Neuro-PS) and to verify the electrophysiologic properties of the Neuro-PS in a pig model.
Methods: We developed 2 types of the Neuro-PS in which a gold lead was located internally (type I) and externally (type II). We measured the electrical resistance of the Neuro-PS and the conventional screw and analyzed the electrical thresholds of triggered EMG (t-EMG) of each screw by intentionally penetrating the medial pedicle wall and contacting the exiting nerve root in a pig model.
Results: The electrical resistances of the Neuro-PS were remarkably lower than that of the conventional screw. In electrophysiologic testing, only the type II Neuro-PS under the leadnerve contact condition showed a significantly lower stimulation threshold as compared to the conventional screw.
Conclusion: The Neuro-PS demonstrated lower electrical resistances than the conventional screw. The type II Neuro-PS under the lead-nerve contact condition showed a significantly lower stimulation threshold compared to that of the other screws in the t-EMG test.
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KEYWORD
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Electromyography, Electrical resistance, Gold lead, Neuromonitoring, Pedicle screw, Titanium alloy
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