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Objectives:
Flexible intramedullary nails are commonly used in children and adolescents to treat long bone fractures, such as the femur, providing a stable but elastic fixation. This study evaluated flexible intramedullary nails for stabilizing femoral fractures in cats through biomechanical testing.
Methods:
Thirty adult cat femurs were used. A mid-diaphyseal transverse fracture was induced and stabilized with two flexible stainless-steel nails of equal diameter, inserted medially and laterally from the supracondylar region of the femur. After the reduction of the fracture, the nails were advanced so that one nail pointed towards the greater trochanter region and the other towards the femoral neck region. The free ends of the nails were cut, and end caps were placed over the exposed ends and screwed into the entry points to the bone cortex. Each test, including axial compression with eccentric load (femoral head), four-point bending, and rotation, was conducted on five constructs and five intact bones.
Results:
The maximum force values in axial compression testing were 1090.51 N (± 374.12) for the intact bone and 608.43 N (± 101.2) for the construct, while in four-point bending testing the values were 1384.75 N (± 191.08) for the intact bone and 131.20 N (± 34.57) for the construct. In torsion, the values were 6.764 Nm (± 4.764) for the intact bone and 0.166 Nm (± 0.075) for the construct.
Conclusions:
The flexible intramedullary nails provide better axial compression and bending stiffness than torsional stability.
34th Annual Scientific Meeting proceedings
Stream:
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Session:
Date/Time: 30-11--0001 (00:00 - 00:00) | Location:
Date/Time: 30-11--0001 (00:00 - 00:00) | Location:
Biomechanical study of flexible intramedullary nails for stabilization of femoral fracture in cats.
Abibe RB1, Rahal SC1, Rodriguez RQ2, Cassanego GR1, Caldeira FMC1, Nicolini LF2, Saunders WB*3
1School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), Botucatu, Brazil, 2Department of Mechanical Engineering, Federal University of Santa Maria, Santa Maria, Brazil, 3Small Animal Clinical Sciences, School of Veterinary Medicine and Biomedical Sciences - Texas A&M University, College Station, USA.
Objectives:
Flexible intramedullary nails are commonly used in children and adolescents to treat long bone fractures, such as the femur, providing a stable but elastic fixation. This study evaluated flexible intramedullary nails for stabilizing femoral fractures in cats through biomechanical testing.
Methods:
Thirty adult cat femurs were used. A mid-diaphyseal transverse fracture was induced and stabilized with two flexible stainless-steel nails of equal diameter, inserted medially and laterally from the supracondylar region of the femur. After the reduction of the fracture, the nails were advanced so that one nail pointed towards the greater trochanter region and the other towards the femoral neck region. The free ends of the nails were cut, and end caps were placed over the exposed ends and screwed into the entry points to the bone cortex. Each test, including axial compression with eccentric load (femoral head), four-point bending, and rotation, was conducted on five constructs and five intact bones.
Results:
The maximum force values in axial compression testing were 1090.51 N (± 374.12) for the intact bone and 608.43 N (± 101.2) for the construct, while in four-point bending testing the values were 1384.75 N (± 191.08) for the intact bone and 131.20 N (± 34.57) for the construct. In torsion, the values were 6.764 Nm (± 4.764) for the intact bone and 0.166 Nm (± 0.075) for the construct.
Conclusions:
The flexible intramedullary nails provide better axial compression and bending stiffness than torsional stability.
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