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Does the proximal screw type affect stress and strain in pastern arthrodesis with locking plate in horses?
de Souza, Anderson Fernando; Pereira, César Augusto Martins; Fürst, Anton; Kümmerle, Jan Michael; De Zoppa, André Luis do Valle.
Afiliación
  • de Souza AF; Department of Surgery, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil. Electronic address: anderson.sji@hotmail.com.
  • Pereira CAM; Institute of Orthopedics and Traumatology, School of Medicine, University of São Paulo, São Paulo, Brazil.
  • Fürst A; Equine Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.
  • Kümmerle JM; Equine Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.
  • De Zoppa ALDV; Department of Surgery, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil.
Res Vet Sci ; 178: 105378, 2024 Oct.
Article en En | MEDLINE | ID: mdl-39137606
ABSTRACT
The implantation of unicortical cortex screws in the proximal hole of locking compression plates (LCP) has been recommended for proximal interphalangeal (PIP) arthrodesis in horses to prevent fractures resulting from stress risers in the proximal phalanx (P1). However, this cortex screw fixation technique may limit efficient dorsal compression of the PIP joint by the plate, potentially affecting the stability of the construct. In this study, we aimed to measure stress and strain in P1 and the plate using an ex vivo model of PIP arthrodesis in horses. We employed various implantation methods and proximal screw types in conjunction with two 5.5 mm transarticular cortex screws. Ten pairs of equine forelimbs were divided into four groups based on proximal screw placement GUC (unicortically placed cortex screw), GBC (bicortically placed cortex screw), GUL (unicortically placed locking screw), and GBL (bicortically placed locking screw). We calculated the magnitude and direction of strain, strain ratio, and stress using strain gauges during an axial compression mechanical testing. The palmar surface of P1 exhibited higher stress and strains than the dorsal surface, with the plate part located at the articular level suffered more stress than the proximal part. Both the implantation method and proximal screw type significantly influenced the analyzed parameters. The GUC promoted greater changes in strain direction in the proximal portion of the P1. Bicortical placement of a cortex screw appears to be the most suitable option for filling the proximal hole of the LCP, because it allows effective dynamic compression via the plate and prevents abrupt shifts in the direction of the forces acting on the proximal part of P1 during loading.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Artrodesis / Estrés Mecánico / Placas Óseas / Tornillos Óseos Límite: Animals Idioma: En Revista: Res Vet Sci Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Artrodesis / Estrés Mecánico / Placas Óseas / Tornillos Óseos Límite: Animals Idioma: En Revista: Res Vet Sci Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido