1. Department of Orthopaedic Surgery; University of California San Francisco; California
2. Sibley School of Mechanical and Aerospace Engineering; Meinig School of Biomedical Engineering; Cornell University; Hospital for Special Surgery; Ithaca New York
3. Discipline of Orthopaedics and Trauma; The University of Adelaide; Adelaide South Australia 5005 Australia
4. Clinical Epidemiology Research and Training Unit Boston University School of Medicine; Boston Massachusetts
5. Department of Anatomy and Tissue Engineering Research Group; Royal College of Surgeons in Ireland; 123 St Stephens Green, Dublin 2 Dublin Ireland
6. Trinity Centre for Bioengineering; Trinity College Dublin; Dublin 2 Dublin Ireland