Materials Transactions Online

Materials Transactions, Vol.57 No.12 (2016) pp.1993-1997
© 2016 The Japan Institute of Metals and Materials

Effect of Solute Oxygen on Compressive Fatigue Strength of Spinal Fixation Rods Made of Ti-29Nb-13Ta-4.6Zr Alloys

Yoon-Seok Lee1, Mitsuo Niinomi1, Masaaki Nakai1, Kengo Narita2 and Huihong Liu1

1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2Medical Department, Maruemu Works CO., LTD, Daito 574-0015, Japan

In spinal fixation devices, the activity of the patient can cause fretting of the metal-to-metal contacts between the rod and plug, which may result in failures. In this study, compressive fatigue tests were conducted with rods made of Ti-29Nb-13Ta-4.6Zr alloy (TNTZ) with oxygen contents of 0.06 mass% (06O) and 0.89 mass% (89O) and Ti-6Al-4V extra low interstitial alloy (Ti64) as comparison in both air and saline solution. The fatigue strength increases in the order of 06O < 89O < Ti64 in both air and saline solution. These results indicate that solid-solution strengthening by oxygen improves the fretting fatigue resistance of the TNTZ rod.

[doi:10.2320/matertrans.MI201504]

(Received 2016/03/28; Accepted 2016/05/10; Published 2016/11/25)

Keywords: Ti-6Al-4V, Ti-29Nb-13Ta-4.6Zr, fretting, spinal fixation, fatigue, biomaterials, orthopedic device

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