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Solid and hollow pedicle screws affect the electrical resistance: A potential source of error with stimulus-evoked electromyography

BACKGROUND: Although stimulus evoked electromyography (EMG) is commonly used to confirm the accuracy of pedicle screw placement. There are no studies to differentiate between solid screws and hollow screws to the electrical resistance of pedicle screws. We speculate that the electrical resistance of...

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Autores principales: Wang, Hongwei, Liao, Xinhua, Ma, Xianguang, Li, Changqing, Han, Jianda, Zhou, Yue
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Medknow Publications & Media Pvt Ltd 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3745688/
https://www.ncbi.nlm.nih.gov/pubmed/23960278
http://dx.doi.org/10.4103/0019-5413.114915
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author Wang, Hongwei
Liao, Xinhua
Ma, Xianguang
Li, Changqing
Han, Jianda
Zhou, Yue
author_facet Wang, Hongwei
Liao, Xinhua
Ma, Xianguang
Li, Changqing
Han, Jianda
Zhou, Yue
author_sort Wang, Hongwei
collection PubMed
description BACKGROUND: Although stimulus evoked electromyography (EMG) is commonly used to confirm the accuracy of pedicle screw placement. There are no studies to differentiate between solid screws and hollow screws to the electrical resistance of pedicle screws. We speculate that the electrical resistance of the solid and hollow pedicle screws may be different and then a potential source of error with stimulus-evoked EMG may happen. MATERIALS AND METHODS: Resistance measurements were obtained from 12 pedicle screw varieties (6 screws of each manufacturer) across the screw shank based on known constant current and measured voltage. The voltage was measured 5 times at each site. RESULTS: Resistance of all solid screws ranged from 0.084 Ω to 0.151 Ω (mean =0.118 ± 0.024 Ω) and hollow screws ranged from 0.148 Ω to 0.402 Ω (mean = 0.285 ± 0.081 Ω). There was a significant difference of resistance between the solid screws and hollow screws (P < 0.05). The screw with the largest diameter no matter solid screws or hollow screws had lower resistance than screws with other diameters. No matter in solid screws group or hollow screws group, there were significant differences (P < 0.05) between the 5.0 mm screws and 6.0 mm screws, 6.0 mm screws and 7.0 mm screws, 5.0 mm screws and 7.0 mm screws, 4.5 mm screws and 5.5 mm screws, 5.5 mm screws and 6.5 mm screws, 4.5 mm screws and 6.5 mm screws. The resistance of hollow screws was much larger than the solid screws in the same diameter group (P < 0.05). CONCLUSIONS: Hollow pedicle screws have the potential for high electrical resistance compared to the solid pedicle screws and therefore may affect the EMG response during stimulus-evoked EMG testing in pedicle screw fixation especially in minimally invasive percutaneous pedical screw fixation surgery.
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spelling pubmed-37456882013-08-19 Solid and hollow pedicle screws affect the electrical resistance: A potential source of error with stimulus-evoked electromyography Wang, Hongwei Liao, Xinhua Ma, Xianguang Li, Changqing Han, Jianda Zhou, Yue Indian J Orthop Original Article BACKGROUND: Although stimulus evoked electromyography (EMG) is commonly used to confirm the accuracy of pedicle screw placement. There are no studies to differentiate between solid screws and hollow screws to the electrical resistance of pedicle screws. We speculate that the electrical resistance of the solid and hollow pedicle screws may be different and then a potential source of error with stimulus-evoked EMG may happen. MATERIALS AND METHODS: Resistance measurements were obtained from 12 pedicle screw varieties (6 screws of each manufacturer) across the screw shank based on known constant current and measured voltage. The voltage was measured 5 times at each site. RESULTS: Resistance of all solid screws ranged from 0.084 Ω to 0.151 Ω (mean =0.118 ± 0.024 Ω) and hollow screws ranged from 0.148 Ω to 0.402 Ω (mean = 0.285 ± 0.081 Ω). There was a significant difference of resistance between the solid screws and hollow screws (P < 0.05). The screw with the largest diameter no matter solid screws or hollow screws had lower resistance than screws with other diameters. No matter in solid screws group or hollow screws group, there were significant differences (P < 0.05) between the 5.0 mm screws and 6.0 mm screws, 6.0 mm screws and 7.0 mm screws, 5.0 mm screws and 7.0 mm screws, 4.5 mm screws and 5.5 mm screws, 5.5 mm screws and 6.5 mm screws, 4.5 mm screws and 6.5 mm screws. The resistance of hollow screws was much larger than the solid screws in the same diameter group (P < 0.05). CONCLUSIONS: Hollow pedicle screws have the potential for high electrical resistance compared to the solid pedicle screws and therefore may affect the EMG response during stimulus-evoked EMG testing in pedicle screw fixation especially in minimally invasive percutaneous pedical screw fixation surgery. Medknow Publications & Media Pvt Ltd 2013 /pmc/articles/PMC3745688/ /pubmed/23960278 http://dx.doi.org/10.4103/0019-5413.114915 Text en Copyright: © Indian Journal of Orthopaedics http://creativecommons.org/licenses/by-nc-sa/3.0 This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Wang, Hongwei
Liao, Xinhua
Ma, Xianguang
Li, Changqing
Han, Jianda
Zhou, Yue
Solid and hollow pedicle screws affect the electrical resistance: A potential source of error with stimulus-evoked electromyography
title Solid and hollow pedicle screws affect the electrical resistance: A potential source of error with stimulus-evoked electromyography
title_full Solid and hollow pedicle screws affect the electrical resistance: A potential source of error with stimulus-evoked electromyography
title_fullStr Solid and hollow pedicle screws affect the electrical resistance: A potential source of error with stimulus-evoked electromyography
title_full_unstemmed Solid and hollow pedicle screws affect the electrical resistance: A potential source of error with stimulus-evoked electromyography
title_short Solid and hollow pedicle screws affect the electrical resistance: A potential source of error with stimulus-evoked electromyography
title_sort solid and hollow pedicle screws affect the electrical resistance: a potential source of error with stimulus-evoked electromyography
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3745688/
https://www.ncbi.nlm.nih.gov/pubmed/23960278
http://dx.doi.org/10.4103/0019-5413.114915
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