About the Authors

Feng Liu

Contributed equally to this work with: Feng Liu, Zhefeng Chen

Zhefeng Chen

Contributed equally to this work with: Feng Liu, Zhefeng Chen

Yanqing Gu
Qing Wang
Weiding Cui
Weimin Fan

fanweimin@vip.sina.com

Affiliation Department of Orthopedics, the First Affiliated Hospital with Nanjing Medical University, Nanjing, China

Competing Interests

Zimmer International donated the cups used in this study. Zimmer International had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Author Contributions

Conceived and designed the experiments: WF. Performed the experiments: FL ZC YG QW WC. Analyzed the data: FL ZC. Wrote the paper: FL ZC.