[1] Univ Queensland, Clin Med Sch, Dept Orthopaed Surg, Brisbane, Qld, Australia
[2] Univ Pretoria, Sch Med, Fac Fac Hlth Sci, Pretoria, South Africa
[3] Royal Brisbane Hosp, Dept Orthopaed Surg, Herston, Qld, Australia
[4] Univ Queensland, Sch Med, Dept Surg, Brisbane, Qld, Australia
[5] Queensland Univ Technol, Brisbane, Qld, Australia
[6] Orthopaed Res Inst Australia, Sydney, NSW, Australia
[7] Univ Texas Hlth Sci Ctr San Antonio, Dept Orthoped Surg, San Antonio, TX 78229 USA