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Pullout strength of adaption screws in thyroid cartilage
1Department of Otolaryngology--Head and Neck Surgery, Eastern Virginia Medical School, Norfolk, USA.
American Journal of Otolaryngology
|June 9, 1998
Summary
Adaption screws can secure laryngeal cartilage, but their pullout strength is lower than in bone. Optimal strength is achieved with a 1.5 mm screw in a 0.76 mm drill hole for laryngeal cartilage fixation.
Area of Science:
- Otolaryngology
- Biomedical Engineering
- Orthopedic Biomechanics
Background:
- Laryngeal framework surgery often requires fixation of cartilage structures.
- Adaption screws are utilized for cartilage fixation, but their biomechanical properties in laryngeal cartilage are not well-defined.
- Understanding screw pullout strength is crucial for surgical success and preventing complications.
Purpose of the Study:
- To evaluate the pullout strength of adaption screws in human cadaver thyroid cartilage.
- To investigate the relationship between drill hole diameter, screw diameter, and screw pullout strength in laryngeal cartilage.
Main Methods:
- Screw pullout strength testing was performed on human cadaver thyroid cartilage using a load cell.
- Three screw diameters (1.3 mm, 1.5 mm, 2.0 mm) and three drill hole diameters (0.76 mm, 1.1 mm, 1.5 mm) were systematically tested.
Main Results:
- The maximum pullout strength was observed with a 1.5 mm screw inserted into a 0.76 mm drill hole, yielding a strength of 27.5 N.
- Pullout strength in laryngeal cartilage was generally lower compared to typical values in cortical bone.
- Smaller drill hole diameters, relative to screw diameter, resulted in increased pullout strength.
Conclusions:
- Adaption screws are viable for use in thyroid cartilage, though their fixation strength is less than in bone.
- Drill holes for screw placement in laryngeal cartilage should be smaller than those recommended for cortical bone.
- The combination of a 1.5 mm screw and a 0.76 mm drill hole provides the maximum pullout strength for adaption screws in thyroid cartilage.
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