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Effect of screw angulation on the bending performance of polyaxial locking interfaces: a micro-CT evaluation.
Glowacki, Jakub; Bartkowiak, Tomasz; Paczos, Piotr; Gapinski, Bartosz; Mietlinski, Patryk; Zawadzki, Pawel; Weiss, Weronika; Lapaj, Lukasz.
Afiliación
  • Glowacki J; Department of General Orthopaedics, Musculoskeletal Oncology and Trauma Surgery, Poznan University of Medical Sciences, Poznan, Poland. dr.jakubglowacki@gmail.com.
  • Bartkowiak T; Institute of Mechanical Technology, Poznan University of Technology, Poznan, Poland.
  • Paczos P; Institute of Applied Mechanics, Poznan University of Technology, Poznan, Poland.
  • Gapinski B; Institute of Mechanical Technology, Poznan University of Technology, Poznan, Poland.
  • Mietlinski P; Institute of Mechanical Technology, Poznan University of Technology, Poznan, Poland.
  • Zawadzki P; Institute of Mechanical Technology, Poznan University of Technology, Poznan, Poland.
  • Weiss W; Institute of Mechanical Technology, Poznan University of Technology, Poznan, Poland.
  • Lapaj L; Department of General Orthopaedics, Musculoskeletal Oncology and Trauma Surgery, Poznan University of Medical Sciences, Poznan, Poland.
Sci Rep ; 13(1): 21740, 2023 12 08.
Article en En | MEDLINE | ID: mdl-38066023
Polyaxial locking plates rely on a specific thread-to-thread interface of the screw head and the plate hole. The objective of this study was to evaluate the mechanical performance of single screw interfaces when inserted off-axis and to establish correlations between those parameters and the engagement of the screw head and the plate hole thread. Three polyaxial locking screw systems were inserted into the corresponding plates at various angles (0°, 5°, 10°, and 15° off-axis). The screws were tested until failure. A micro-CT was performed to examine the interface between the plate hole and the screw head. The standard insertion at 0° sustained the greatest maximum bending strength without relocation in the screw hole. Screws inserted at 15° showed a significant reduction in force of up to 44%, 55% and 57%, respectively. Micro-CT analysis of the interface showed a significant loss of thread engagement for off-axis insertion. Polyaxial plates offer additional advantages for off-axis placement of screws. However, this flexibility is related to a significant decrease in both thread engagement and bending strength compared to monoaxial insertion. Regardless the insertion angle, the loss of stability is comparable when screws are placed off-axis. Surgeons are advised to consider off-axis insertion as a salvage option, providing access to better bone stock.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Tornillos Óseos / Fijación Interna de Fracturas Idioma: En Revista: Sci Rep Año: 2023 Tipo del documento: Article País de afiliación: Polonia Pais de publicación: Reino Unido
Texto completo
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Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Tornillos Óseos / Fijación Interna de Fracturas Idioma: En Revista: Sci Rep Año: 2023 Tipo del documento: Article País de afiliación: Polonia Pais de publicación: Reino Unido