Little Jeffrey P, Horn Timothy J, Marcellin-Little Denis J, Harrysson Ola L A, West Harvey A
Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606, USA.
Am J Vet Res. 2012 Jan;73(1):27-33. doi: 10.2460/ajvr.73.1.27.
To design and fabricate fiberglass-reinforced composite (FRC) replicas of a canine radius and compare their mechanical properties with those of radii from dog cadavers.
Replicas based on 3 FRC formulations with 33%, 50%, or 60% short-length discontinuous fiberglass by weight (7 replicas/group) and 5 radii from large (> 30-kg) dog cadavers.
Bones and FRC replicas underwent nondestructive mechanical testing including 4-point bending, axial loading, and torsion and destructive testing to failure during 4-point bending. Axial, internal and external torsional, and bending stiffnesses were calculated. Axial pullout loads for bone screws placed in the replicas and cadaveric radii were also assessed.
Axial, internal and external torsional, and 4-point bending stiffnesses of FRC replicas increased significantly with increasing fiberglass content. The 4-point bending stiffness of 33% and 50% FRC replicas and axial and internal torsional stiffnesses of 33% FRC replicas were equivalent to the cadaveric bone stiffnesses. Ultimate 4-point bending loads did not differ significantly between FRC replicas and bones. Ultimate screw pullout loads did not differ significantly between 33% or 50% FRC replicas and bones. Mechanical property variability (coefficient of variation) of cadaveric radii was approximately 2 to 19 times that of FRC replicas, depending on loading protocols.
Within the range of properties tested, FRC replicas had mechanical properties equivalent to and mechanical property variability less than those of radii from dog cadavers. Results indicated that FRC replicas may be a useful alternative to cadaveric bones for biomechanical testing of canine bone constructs.
设计并制作犬桡骨的玻璃纤维增强复合材料（FRC）复制品，并将其力学性能与犬尸体桡骨的力学性能进行比较。
基于3种FRC配方制作的复制品，按重量计分别含有33%、50%或60%的短切不连续玻璃纤维（每组7个复制品），以及取自大型（>30 kg）犬尸体的5根桡骨。
对骨骼和FRC复制品进行无损力学测试，包括四点弯曲、轴向加载和扭转测试，以及四点弯曲至破坏的破坏性测试。计算轴向、内部和外部扭转刚度以及弯曲刚度。还评估了植入复制品和尸体桡骨中的骨螺钉的轴向拔出载荷。
FRC复制品的轴向、内部和外部扭转刚度以及四点弯曲刚度随玻璃纤维含量的增加而显著增加。33%和50% FRC复制品的四点弯曲刚度以及33% FRC复制品的轴向和内部扭转刚度与尸体骨刚度相当。FRC复制品和骨骼的极限四点弯曲载荷无显著差异。33%或50% FRC复制品与骨骼之间的极限螺钉拔出载荷无显著差异。根据加载方案，尸体桡骨的力学性能变异性（变异系数）约为FRC复制品的2至19倍。
在所测试的性能范围内，FRC复制品的力学性能与犬尸体桡骨相当，且力学性能变异性小于犬尸体桡骨。结果表明，FRC复制品可能是用于犬骨结构生物力学测试的尸体骨的有用替代品。
