A radiologic determination of the different screw cutting patterns in cut and uncut orthopedic cortical screws using a novel imaging technique

A radiologic determination of the different screw cutting patterns in cut and uncut orthopedic cortical screws using a novel imaging technique

Objective We hypothesize that cut screws will deform in a manner that increases the core and outer diameters of the screw hole compared to uncut controls, and effects will be more pronounced in titanium screws. Materials and methods We used biomechanical polyurethane foam blocks to simulate cortical...

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Bibliographic Details
Published in:Skeletal radiology Vol. 52; no. 12; pp. 2461 - 2467
Main Authors: Major, Joshua W., Ernst, Andrew J., Kallevang, Jonathan K., Kaeck, Alexander, Grijalva, Stephen D., Douglas, Thomas J., Wilson, Andrew W., Garry, Conor B.
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-12-2023
Springer Nature B.V
Subjects:
Biomechanics
Cortical bone
Cutting
Deformation effects
Diameters
Imaging
Imaging techniques
Mammography
Medicine
Medicine & Public Health
Nuclear Medicine
Orthopedics
Pathology
Polyurethane
Polyurethane foam
Radiology
Scientific Article
Screw threads
Stainless steel
Stainless steels
Statistical analysis
Titanium
Polyurethane foam blocks
Digital mammography
Orthopedic surgery
Screw deformation
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Summary:Objective We hypothesize that cut screws will deform in a manner that increases the core and outer diameters of the screw hole compared to uncut controls, and effects will be more pronounced in titanium screws. Materials and methods We used biomechanical polyurethane foam blocks to simulate cortical bone. We organized four groups of stainless steel and titanium cut and uncut screws. Blocks were fitted with a jig to ensure perpendicular screw insertion. We imaged the blocks using digital mammography and measured them using PACS software. Power analysis determined a power of 0.95 and an alpha error of 0.05. Results Highly statistically significant differences in core diameter were found after cutting stainless steel and titanium screws. Cutting stainless steel screws increased core diameter by 0.30 mm (95% CI, 0.16 to 0.45; p < .001). Titanium screws’ core diameter increased by 0.45 mm (95% CI, 0.30 to 0.61; p < .001). No significant differences were found in the outer diameters of stainless steel and titanium screws after cutting. Conclusion Titanium and stainless steel screw tracts demonstrated screw core diameter and screw thread pattern deformation after cutting. Titanium screws demonstrated more significant effects.
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ISSN:0364-2348
1432-2161
DOI:10.1007/s00256-023-04368-7