In vivo testing of porous Ti-25Nb alloy serving as a femoral stem prosthesis in a rabbit model

Weng,Xiaojun; Yang,Hailin; Xu,Jian; Li,Xiaosheng; Liao,Qiande; Wang,Jing

doi:10.3892/etm.2016.3472

In vivo testing of porous Ti-25Nb alloy serving as a femoral stem prosthesis in a rabbit model

Authors:
- Xiaojun Weng
- Hailin Yang
- Jian Xu
- Xiaosheng Li
- Qiande Liao
- Jing Wang
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Affiliations: Department of Joint Surgery, Hunan Provincial People's Hospital, Changsha, Hunan 410005, P.R. China, Powder Metallurgy Research Institute, Central South University, Changsha, Hunan 410078, P.R. China, Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China, Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410078, P.R. China
Published online on: June 23, 2016 https://doi.org/10.3892/etm.2016.3472
Pages: 1323-1330
Copyright: © Weng et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The aim of the present study was to observe the performance of Ti-25Nb alloys with various porosities as femoral stem prostheses in a rabbit model, thus providing basic experimental evidence for the development of porous prostheses. The porous Ti-25Nb alloy prostheses were designed according to the morphology of the medullary cavity. These prostheses were placed into the femoral medullary cavities in 36 New Zealand white rabbits. Postoperative X‑ray films, scanning electron microscopy (SEM) of the implant interface, energy‑dispersive spectroscopy (EDS) analysis of the implant surface, pulling‑out test and general observations were conducted. The specimens showed good biocompatibility; there was no obvious bone absorption in porous Ti‑25Nb specimens with different porosities at different time points observed using X‑ray films. Under SEM examination, calcium deposits were observed inside the pores and in the interface between bone and prostheses. The EDS analysis demonstrated that calcium deposits were present on the surface of the prostheses at the eight‑week point postoperatively. The pulling‑out test showed good bonding strength between bone and implant; after pulling out, the surface and inside the pores of the prostheses all presented bone mass. Porous Ti-25Nb alloy implants presents good biocompatibility as well as providing a biological fixation between the bone and implant. A porosity of 70% is more advantageous to the newborn bone ingrowth, combined with achieving a more solid bone-implant interface.

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