Can barb thread design improve the pullout strength of bone screws?: a biomechanical study and finite element explanation
| Autor: | Frankie Leung, Weichen Qi, Bin Chen, William W. Lu, Christian X Fang, Xiaoreng Feng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Buttress
lcsh:Diseases of the musculoskeletal system Computer science reverse buttress thread Thread (computing) pullout strength Finite element study 03 medical and health sciences 0302 clinical medicine buttress thread Orthopedics and Sports Medicine barb thread 030222 orthopedics biology business.industry finite element study 030206 dentistry Pullout strength Structural engineering biology.organism_classification Bone screws Barb biomechanical study Surgery lcsh:RC925-935 business |
| Zdroj: | Bone & Joint Research, Vol 10, Iss 2, Pp 105-112 (2021) |
| ISSN: | 2046-3758 |
| DOI: | 10.1302/2046-3758.102.BJR-2020-0072.R2 |
| Popis: | Aims To draw a comparison of the pullout strengths of buttress thread, barb thread, and reverse buttress thread bone screws. Methods Buttress thread, barb thread, and reverse buttress thread bone screws were inserted into synthetic cancellous bone blocks. Five screw-block constructs per group were tested to failure in an axial pullout test. The pullout strengths were calculated and compared. A finite element analysis (FEA) was performed to explore the underlying failure mechanisms. FEA models of the three different screw-bone constructs were developed. A pullout force of 250 N was applied to the screw head with a fixed bone model. The compressive and tensile strain contours of the midsagittal plane of the three bone models were plotted and compared. Results The barb thread demonstrated the lowest pullout strength (mean 176.16 N (SD 3.10)) among the three thread types. It formed a considerably larger region with high tensile strains and a slightly smaller region with high compressive strains within the surrounding bone structure. The reverse buttress thread demonstrated the highest pullout strength (mean 254.69 N (SD 4.15)) among the three types of thread. It formed a considerably larger region with high compressive strains and a slightly smaller region with high tensile strains within the surrounding bone structure. Conclusion Bone screws with a reverse buttress thread design will significantly increase the pullout strength. Cite this article: Bone Joint Res 2021;10(2):105–112. |
| Databáze: | OpenAIRE |
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