TUHH Open Research
Help
  • Log In
    New user? Click here to register.Have you forgotten your password?
  • English
  • Deutsch
  • Communities & Collections
  • Publications
  • Research Data
  • People
  • Institutions
  • Projects
  • Statistics
  1. Home
  2. TUHH
  3. Publication References
  4. Impact of Screw Diameter on Pedicle Screw Fatigue Strength - A Biomechanical Evaluation
 
Options

Impact of Screw Diameter on Pedicle Screw Fatigue Strength - A Biomechanical Evaluation

Publikationstyp
Journal Article
Date Issued
2021-08
Sprache
English
Author(s)
Viezens, Lennart  
Sellenschloh, Kay  
Püschel, Klaus  
Morlock, Michael  
Lehmann, Wolfgang  
Huber, Gerd  
Weiser, Lukas  
Institut
Biomechanik M-3  
TORE-URI
http://hdl.handle.net/11420/10293
Journal
World neurosurgery  
Volume
152
Start Page
e369
End Page
e376
Citation
World Neurosurgery 152: e369-e376 (2021-08)
Publisher DOI
10.1016/j.wneu.2021.05.108
Scopus ID
2-s2.0-85107969895
PubMed ID
34087457
Objective: Loosening of pedicle screws is a frequently observed complication in spinal surgery. Because additional stabilization procedures such as cement augmentation or lengthening of the instrumentation involve relevant risks, optimal stability of the primarily implanted pedicle screw is of essential importance. The aim of the present study was to investigate the effect of increasing the screw diameter on pedicle screw stability. Methods: A total of 10 human cadaveric vertebral bodies (L4) were included in the present study. The bone mineral density was evaluated using quantitative computed tomography and the pedicle diameter using computed tomography. The vertebrae underwent instrumentation using 6.0-mm × 45-mm pedicle screws on 1 side and screws with the largest possible diameter (8–10-mm × 45-mm) on the other side. Fatigue testing was performed by applying a cyclic loading (craniocaudal sinusoidal 0.5 Hz) with increasing peak force (100 N + 0.1 N/cycle) until screw head displacement of 5.4 mm was reached. Results: The mean fatigue load was 334 N for the 6-mm diameter screws and was increased significantly to 454 N (+36%) for the largest possible diameter screws (P < 0.001). With an increase in the fatigue load by 52%, this effect was even more pronounced in vertebrae with reduced bone density (bone mineral density <120 mg/cm3; n = 7; P < 0.001). The stiffness of the construct was significantly greater in the largest diameter screw group compared with the standard screw group during the entire testing period (start, P < 0.001; middle, P < 0.001; end, P = 0.009). Conclusions: Increasing the pedicle screw diameter from a standard 6-mm screw to the largest possible diameter (8–10 mm) led to a significantly greater fatigue load.
Subjects
Pedicle screw
Pedicle screw diameter
Pedicle screw loosening
Pedicle screw size
Spine
TUHH
Weiterführende Links
  • Contact
  • Send Feedback
  • Cookie settings
  • Privacy policy
  • Impress
DSpace Software

Built with DSpace-CRIS software - Extension maintained and optimized by 4Science
Design by effective webwork GmbH

  • Deutsche NationalbibliothekDeutsche Nationalbibliothek
  • ORCiD Member OrganizationORCiD Member Organization
  • DataCiteDataCite
  • Re3DataRe3Data
  • OpenDOAROpenDOAR
  • OpenAireOpenAire
  • BASE Bielefeld Academic Search EngineBASE Bielefeld Academic Search Engine
Feedback