Yoshimoto Kensei, Nakashima Yasuharu, Wakiyama Miyo, Hara Daisuke, Nakamura Akihiro, Iwamoto Mikio
Department of Orthopedic Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
Kyocera Medical Corporation, 3-3-31 Miyahara, Yodogawa-ku, Osaka, Osaka, 532-0003, Japan.
J Orthop Sci. 2018 Jul;23(4):665-670. doi: 10.1016/j.jos.2018.03.007. Epub 2018 Apr 12.
The purpose of this study was to quantify the initial stability of a highly porous titanium cup using an acetabular bone defect model.
The maximum torque of a highly porous titanium cup, with a pore size of 640 μm and porosity of 60%, was measured using rotational and lever-out torque testing and compared to that of a titanium-sprayed cup. The bone models were prepared using a polyurethane foam block and had three levels of bone coverage: 100, 70, and 50%.
The highly porous titanium cup demonstrated significantly higher maximum torque than the titanium-sprayed cups in the three levels of bone defects. On rotational torque testing, it was found to be 1.5, 1.3, and 1.3 times stronger than the titanium-sprayed cups with 100, 70 and 50% bone coverage, respectively. Furthermore, it was found to be 2.2, 2.3, and 1.5 times stronger on lever-out testing than the titanium-sprayed cup. No breakage in the porous layers was noted during the testing.
This study provides additional evidence of the initial stability of highly porous titanium cup, even in the presence of acetabular bone defects.
本研究的目的是使用髋臼骨缺损模型量化高度多孔钛杯的初始稳定性。
使用旋转和拔出扭矩测试测量孔径为640μm、孔隙率为60%的高度多孔钛杯的最大扭矩，并与钛喷涂杯的最大扭矩进行比较。使用聚氨酯泡沫块制备骨模型，其骨覆盖率有三个水平：100%、70%和50%。
在三种水平的骨缺损中，高度多孔钛杯的最大扭矩显著高于钛喷涂杯。在旋转扭矩测试中，发现它分别比骨覆盖率为100%、70%和50%的钛喷涂杯强1.5倍、1.3倍和1.3倍。此外，在拔出测试中，发现它比钛喷涂杯强2.2倍、2.3倍和1.5倍。测试过程中未发现多孔层有破损。
本研究为高度多孔钛杯的初始稳定性提供了额外证据，即使存在髋臼骨缺损。
