Implant-related artifacts around metallic and bio-integrative screws: a CT scan 3D Hounsfield unit assessment

Authors

  • Christian VandeLune Department of Orthopedics and Rehabilitation, University of Iowa, Carver College of Medicine, Iowa City-IA, USA https://orcid.org/0000-0002-7797-6111
  • Tutku Tazegul Department of Orthopedics and Rehabilitation, University of Iowa, Carver College of Medicine, Iowa City-IA, USA
  • Samuel J Ahrenholz Department of Orthopedics and Rehabilitation, University of Iowa, Carver College of Medicine, Iowa City-IA, USA https://orcid.org/0000-0002-5486-9858
  • Caleb Iehl Department of Orthopedics and Rehabilitation, University of Iowa, Carver College of Medicine, Iowa City-IA, USA https://orcid.org/0000-0003-1434-2725
  • Victoria Vivtcharenko Department of Orthopedics and Rehabilitation, University of Iowa, Carver College of Medicine, Iowa City-IA, USA https://orcid.org/0000-0002-1574-3793
  • Eli Schmidt Department of Orthopedics and Rehabilitation, University of Iowa, Carver College of Medicine, Iowa City-IA, USA https://orcid.org/0000-0002-6922-5238
  • Kevin N Dibbern Department of Orthopedics and Rehabilitation, University of Iowa, Carver College of Medicine, Iowa City-IA, USA https://orcid.org/0000-0002-8061-4453
  • Hee Young Lee Department of Orthopedics and Rehabilitation, University of Iowa, Carver College of Medicine, Iowa City-IA, USA https://orcid.org/0000-0003-4179-9501
  • Matthieu Lalevee Department of Orthopedics and Rehabilitation, University of Iowa, Carver College of Medicine, Iowa City-IA, USA
  • Nacime Salomão Barbachan Mansur Department of Orthopedics and Rehabilitation, University of Iowa, Carver College of Medicine, Iowa City-IA, USA https://orcid.org/0000-0003-1067-727X
  • César de César Netto Department of Orthopedics and Rehabilitation, University of Iowa, Carver College of Medicine, Iowa City-IA, USA https://orcid.org/0000-0001-6037-0685

DOI:

https://doi.org/10.30795/jfootankle.2021.v15.1562

Keywords:

Osteotomy, Calcaneus, Metals, Radiography, Tomography, x-ray computed

Abstract

Objective: To assess the degree of implant-related artifacts (IRA) around metallic and bio-integrative (BI) cannulated screws using Hounsfield units (HU) on computed tomography (CT). Our hypothesis was that BI implants would demonstrate significantly decreased IRA around the inserted screws. Methods: In this cadaveric CT imaging study, we used 2 below-knee specimens. Medial displacement calcaneal osteotomy was performed, and the specimens were fixed with either metallic or BI screws. HU values were measured over 4 different lines that crossed the osteotomy position. Results: The mean HU value was decreased in the BI implants compared to the metallic ones in 3 different positions: near the screw, directly over the screw, and inside the screw cannula. At the line placed 1 cm dorsal to the screw, the HU value for the metallic screw was lower than that for the BI screw. Conclusions: We found metallic implants to demonstrate significantly increased HU values in regions close to the implant and significantly decreased values 1 cm away from the implant, when compared to the BI screw. The decreased HU values 1 cm away from the implant could be due to a shielding effect of the surrounding bone, hindering the assessment of union and healing. BI implants represent an alternative to decrease these IRA effects. Level of Evidence III; Case-Control Study.

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Published

2021-08-31

How to Cite

VandeLune, C., Tazegul , T., J Ahrenholz, S. ., Iehl, C., Vivtcharenko, V. ., Schmidt, E. ., N Dibbern, K., Lee, H. Y., Lalevee, M., Barbachan Mansur, N. S., & de César Netto, C. (2021). Implant-related artifacts around metallic and bio-integrative screws: a CT scan 3D Hounsfield unit assessment. Journal of the Foot & Ankle, 15(2), 95–99. https://doi.org/10.30795/jfootankle.2021.v15.1562