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Staple leg profile influence on pullout strength: a biomechanical study
K K Firoozbakhsh1, T A DeCoster, M S Moneim
1Division of Biomechanics, Sharif University of Technology, Tehran, Iran.
Clinical Orthopaedics and Related Research
|October 1, 1996
Summary
The curvilinear square bone staple leg profile offers superior fixation strength compared to other designs. This enhanced bone fixation may broaden the clinical applications of bone staples in orthopaedic surgery.
Area of Science:
- Orthopaedic Surgery
- Biomechanical Engineering
- Materials Science
Background:
- Bone staples are widely used in orthopaedic surgery.
- Current staple fixation quality is inconsistent, limiting their application.
- Previous research suggests modifying staple leg design can improve fixation reliability.
Purpose of the Study:
- To evaluate the pullout strength of five novel staple leg cross-section profiles.
- To identify a superior cross-section profile for enhanced bone staple fixation.
- To compare fixation performance in both human cadaveric and synthetic bone models.
Main Methods:
- Pullout strength testing of five new staple leg cross-section designs.
- Testing conducted on fresh frozen human cadaveric bone and a synthetic bone model.
- Evaluation performed before and after cyclic toggle loading to assess fixation durability.
Main Results:
- The curvilinear square profile demonstrated the highest pullout strength in both bone models.
- Compared to square and circular profiles, the curvilinear square showed 8% and 34% greater pullout strength, respectively.
- Triangular profiles exhibited the lowest resistance to pullout force, even after cyclic loading.
Conclusions:
- The curvilinear square cross-section profile is optimal for maximizing bone staple pullout strength.
- This improved fixation may expand the clinical utility of bone staples in orthopaedic procedures.
- Novel staple leg designs offer a promising avenue for enhancing bone fixation quality.