Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India.
Auxein Medical Private Limited, Sonipat 131028, India.
Biomed Res Int. 2022 Mar 21;2022:6534749. doi: 10.1155/2022/6534749. eCollection 2022.
This study investigates the static and fatigue behavior of porous and conventional anterior cervical cages. Porous structure titanium anterior cervical cages were manufactured using direct selective laser sintering technique. Four different types of cervical cages were designed and manufactured, among which three designs consist of porous structure (type 1, type 2, and type 3) and manufactured using metal 3D printing. Remaining one design (type 4) was manufactured using conventional machining and did not consist any porous structure. All types of manufactured cages were tested in compression under static and fatigue loading conditions as per ASTM F2077 standard. Static and fatigue subsidence testing was performed using ASTM F2267 standard. Static compression testing results of type 1 and type 4 cages reported higher yield load when compared to the type 2 and type 3 cages. Static subsidence testing results reported almost 11% less subsidence rate for additively manufactured cages than the conventional cages. Fatigue subsidence testing results showed that type 2 and type 3 cages can withstood approximately 21% higher number of cycles before subsidence as compare to the type 1 and type 4 cages. During fatigue testing, all the cages design survived 5 million cycles at the 3000 N loading. For 6000 N and 8000 N, loading rate type 2 and type 3 cages showed lower fatigue life when compared to other cages design. Since fatigue life of type 2 and type 3 cage designs were reported lower than other cages design, it is concluded that the performance of the additively manufactured porous cages can be significantly varied based upon the cage design features.
本研究考察了多孔和传统颈椎前路融合器的静态和疲劳性能。使用直接选择性激光烧结技术制造多孔结构钛颈椎前路融合器。设计并制造了四种不同类型的颈椎融合器，其中三种设计采用多孔结构（类型 1、类型 2 和类型 3），并采用金属 3D 打印制造。其余一种设计（类型 4）采用传统加工制造，不包含任何多孔结构。根据 ASTM F2077 标准，所有类型的制造融合器均在静态和疲劳加载条件下进行压缩测试。根据 ASTM F2267 标准进行静态和疲劳下沉测试。与类型 2 和类型 3 融合器相比，类型 1 和类型 4 融合器的静态压缩测试结果报告的屈服载荷更高。静态下沉测试结果报告称，与传统融合器相比，增材制造融合器的下沉率低约 11%。疲劳下沉测试结果表明，与类型 1 和类型 4 融合器相比，类型 2 和类型 3 融合器在下沉之前可以承受大约 21%更高的循环次数。在疲劳测试中，所有设计的融合器在 3000 N 的负载下都能承受 500 万次循环。对于 6000 N 和 8000 N 的负载，与其他融合器设计相比，类型 2 和类型 3 融合器的疲劳寿命较低。由于类型 2 和类型 3 融合器设计的疲劳寿命报告低于其他融合器设计，因此可以得出结论，增材制造多孔融合器的性能可以根据融合器设计特征而显著变化。
