Initial stability of a highly porous titanium cup in an acetabular bone defect model

Kensei Yoshimoto, Yasuharu Nakashima, Miyo Wakiyama, Daisuke Hara, Akihiro Nakamura, Mikio Iwamoto

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Backgrounds: The purpose of this study was to quantify the initial stability of a highly porous titanium cup using an acetabular bone defect model. Methods: 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%. Results: 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. Conclusion: This study provides additional evidence of the initial stability of highly porous titanium cup, even in the presence of acetabular bone defects.

Original languageEnglish
Pages (from-to)665-670
Number of pages6
JournalJournal of Orthopaedic Science
Issue number4
Publication statusPublished - Jul 2018

All Science Journal Classification (ASJC) codes

  • Surgery
  • Orthopedics and Sports Medicine


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