Development of Neuromonitoring Pedicle Screw - Results of Electrical Resistance and Neurophysiologic Test in Pig Model

• Published in: Neurospine Vol. 18; no. 1; pp. 117 - 125
• Main Authors: Bang, Woo-Seok, Park, Jonghoo, Kim, Kyoung-Tae, Cho, Dae-Chul, Riew, K. Daniel, Kim, Du-Hwan, Han, In-Bo, Hyun, Seung-Jae, Yoon, Do-Heum, Kim, Young-Baeg
• Format: Journal Article
• Language: English
• Published: Korea (South) Korean Spinal Neurosurgery Society 01.03.2021; 대한척추신경외과학회
• Subjects: electrical resistance; electromyography; gold lead; neuromonitoring; Original; pedicle screw; titanium alloy; 신경외과학; Titanium alloy; Electrical resistance; Pedicle screw; Electromyography; Gold lead; Neuromonitoring
• DOI: 10.14245/ns.2040424.212
• ISSN: 2586-6583

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. 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. 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. 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.