Long Fiber Type Carbon Fiber Reinforced Plastic Pedicle Screws Exhibit High Strength, Comparable to Titanium-Alloy Screws, and Are Resistant to Loosening.

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Název: Long Fiber Type Carbon Fiber Reinforced Plastic Pedicle Screws Exhibit High Strength, Comparable to Titanium-Alloy Screws, and Are Resistant to Loosening.
Autoři: Morita, Kohei, Ohashi, Hiroki, Tsuchida, Kenji, Furuta, Yasuhiro, Tani, Satoshi, Karagiozov, Kostadin, Murayama, Yuichi
Zdroj: Neurospine; Sep2025, Vol. 22 Issue 3, p774-783, 10p
Témata: CARBON fiber-reinforced plastics, BONE screws, SPINAL implants, CHEMICAL stability, DURABILITY
Abstrakt: Objective: To develop a pedicle screw for posterior spinal fixation using this long fiber carbon fiber reinforced plastic (CFRP) technology and evaluate its strength and radiolucency compared with titanium (Ti)-alloy screws. Methods: In this preclinical study, the shear strength, torsional strength, loosening resistance, and image evaluation of long fiber type CFRP pedicle screws and Ti-alloy screws were compared. A series of tests was conducted for future clinical-use approval. Results: The long fiber type CFRP pedicle screw (mean±standard deviation: 11,377.7±245.1 N) had superior shear strength compared to the Ti-alloy pedicle screw (10,300.3±249.7 N). The long fiber type CFRP pedicle screw (4.4±0.5 Nm) had inferior torsional strength compared to the Ti-alloy pedicle screw (22.4±0.6 Nm), although it could withstand twice the maximum load applied during surgery, suggesting that this will not be a clinical concern. In terms of loosening resistance, maximum torque values of the long fiber type CFRP pedicle screw and Ti-alloy pedicle screw were 0.99±0.08 and 0.75±0.05 Nm, respectively. The long fiber type CFRP pedicle screw was significantly more resistant to loosening than the Ti-alloy pedicle screw. Moreover, artifacts in the radiographic images were smaller than those observed for the Ti alloy. Biosafety and magnetic resonance safety tests also yielded satisfactory results, supporting approval of the long fiber CFRP pedicle screws for clinical use. Conclusion: Compared to existing Ti-alloy screws, the long fiber type CFRP pedicle screw with innovative manufacturing technology has sufficient performance for clinical use, and its use may make spinal surgery safer and more effective. [ABSTRACT FROM AUTHOR]
Copyright of Neurospine is the property of Korean Spinal Neurosurgery Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Long Fiber Type Carbon Fiber Reinforced Plastic Pedicle Screws Exhibit High Strength, Comparable to Titanium-Alloy Screws, and Are Resistant to Loosening.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Morita%2C+Kohei%22">Morita, Kohei</searchLink><br /><searchLink fieldCode="AR" term="%22Ohashi%2C+Hiroki%22">Ohashi, Hiroki</searchLink><br /><searchLink fieldCode="AR" term="%22Tsuchida%2C+Kenji%22">Tsuchida, Kenji</searchLink><br /><searchLink fieldCode="AR" term="%22Furuta%2C+Yasuhiro%22">Furuta, Yasuhiro</searchLink><br /><searchLink fieldCode="AR" term="%22Tani%2C+Satoshi%22">Tani, Satoshi</searchLink><br /><searchLink fieldCode="AR" term="%22Karagiozov%2C+Kostadin%22">Karagiozov, Kostadin</searchLink><br /><searchLink fieldCode="AR" term="%22Murayama%2C+Yuichi%22">Murayama, Yuichi</searchLink>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: Neurospine; Sep2025, Vol. 22 Issue 3, p774-783, 10p
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22CARBON+fiber-reinforced+plastics%22">CARBON fiber-reinforced plastics</searchLink><br /><searchLink fieldCode="DE" term="%22BONE+screws%22">BONE screws</searchLink><br /><searchLink fieldCode="DE" term="%22SPINAL+implants%22">SPINAL implants</searchLink><br /><searchLink fieldCode="DE" term="%22CHEMICAL+stability%22">CHEMICAL stability</searchLink><br /><searchLink fieldCode="DE" term="%22DURABILITY%22">DURABILITY</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Objective: To develop a pedicle screw for posterior spinal fixation using this long fiber carbon fiber reinforced plastic (CFRP) technology and evaluate its strength and radiolucency compared with titanium (Ti)-alloy screws. Methods: In this preclinical study, the shear strength, torsional strength, loosening resistance, and image evaluation of long fiber type CFRP pedicle screws and Ti-alloy screws were compared. A series of tests was conducted for future clinical-use approval. Results: The long fiber type CFRP pedicle screw (mean±standard deviation: 11,377.7±245.1 N) had superior shear strength compared to the Ti-alloy pedicle screw (10,300.3±249.7 N). The long fiber type CFRP pedicle screw (4.4±0.5 Nm) had inferior torsional strength compared to the Ti-alloy pedicle screw (22.4±0.6 Nm), although it could withstand twice the maximum load applied during surgery, suggesting that this will not be a clinical concern. In terms of loosening resistance, maximum torque values of the long fiber type CFRP pedicle screw and Ti-alloy pedicle screw were 0.99±0.08 and 0.75±0.05 Nm, respectively. The long fiber type CFRP pedicle screw was significantly more resistant to loosening than the Ti-alloy pedicle screw. Moreover, artifacts in the radiographic images were smaller than those observed for the Ti alloy. Biosafety and magnetic resonance safety tests also yielded satisfactory results, supporting approval of the long fiber CFRP pedicle screws for clinical use. Conclusion: Compared to existing Ti-alloy screws, the long fiber type CFRP pedicle screw with innovative manufacturing technology has sufficient performance for clinical use, and its use may make spinal surgery safer and more effective. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label:
  Group: Ab
  Data: <i>Copyright of Neurospine is the property of Korean Spinal Neurosurgery Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – TitleFull: Long Fiber Type Carbon Fiber Reinforced Plastic Pedicle Screws Exhibit High Strength, Comparable to Titanium-Alloy Screws, and Are Resistant to Loosening.
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              Text: Sep2025
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