1. John A. Paulson School of Engineering and Applied Sciences; Harvard University; Cambridge MA 02138 USA
2. The Key Laboratory of Biomedical Information Engineering of Ministry of Education; School of Life Science and Technology; Xi'an Jiaotong University; Xi'an 710049 Shanxi China
3. Bioinspired Engineering and Biomechanics Center; Xi'an Jiaotong University; Xi'an 710049 China
4. Department of Orthopaedic Surgery; Shanghai Sixth People's Hospital Affiliated to Shanghai Jiaotong University; Shanghai 200233 China
5. Centre for Nanotechnology and Regenerative Medicine; UCL Division of Surgery and Interventional Science; University College London; London WC1E 6AU UK
6. Department of Orthopedics, the First Affiliated Hospital of Soochow University; Orthopedic Institute; Soochow University; 708 Renmin Road Suzhou Jiangsu 215006 China
7. Department of Physics; Harvard University; Cambridge MA 02138 USA