Development of newly interlocking nail. gear and implatation technique detailing and biomechanical tests in canine femur

• Grant number: 17/03027-8
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: May 01, 2017
• End date: September 30, 2020
• Field of knowledge: Agronomical Sciences - Veterinary Medicine - Animal Clinics and Surgery
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Luis Gustavo Gosuen Gonçalves Dias
• Grantee: Maria Eduarda Bastos Andrade Moutinho da Conceição
• Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
• Associated scholarship(s): 19/01422-2 - LEARNING IN LOCKING PLATE SYSTEM AND ITS USE IN TREATMENT OF APPENDICULAR SKELETON FRACTURE, BE.EP.DR

Abstract

Intelocking Nails are known for their biomechanical advantages, but the national model is inaccurate with regard to the screw locks, therefore there is significant slack between the screw and the stem orifice, causing residual instability in the fracture focus, what promote failure or delay in bone repair. The aim of this study was to develop, describe and evaluate the feasibility of a new model of blocked intramedullary nail and material for its implantation, as well as to compare it with the national Popak model and also with the plate-rod technique, by means of biomechanical testing of compression, torsion and flexion. The changes proposed in the equipment, it is worth mentioning the making of threads in the holes of the drill guide that together the threaded gloves will provide greater accuracy in the perforations, minimizing the usual blocking errors, in addition the thread will have threads in the locking holes for perfect threading In the screw, which in turn will consist of three parts: the first will have a smooth profile, the second will be threaded, which will allow locking with the threads of the rod hole, and the third portion will also have a thread profile, but thinner for To attach to the opposite (cortical) cortical bone. For the biomechanical tests 60 macerated femurs of 30 dogs with more than 20 kg of body mass will be used. All femurs will undergo bone failure in the median shaft. The 30 left femurs will receive the new stem on screen, and, for rights, 15 will be implanted with the national stem (Popak System) and the remaining 15 with the plate and pine technique. The biomechanical tests will be paired comparing the contralateral bones of the same dog containing different implants (new stem versus Popak stem, and new stem versus plate and pin). It is expected that with the structural changes in the system, the new rod will be more resistant to the forces studied when compared to the other techniques tested (AU)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

CONCEIÇÃO, Maria Eduarda Bastos Andrade Moutinho da. Novel interlocking nail design. Material, placing technique and mechanical test in canine femur.. 2020. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal Jaboticabal.