[1] Boston Univ, Boston Med Ctr, Med Sch, Dept Orthopaed Surg, Boston, MA 02215 USA
[2] Univ Manitoba, Sect Orthopaed Surg, Winnipeg, MB, Canada
[3] Sinai Hosp, Rubin Inst Adv Orthoped, Ctr Joint Preservat & Replacement, Baltimore, MD USA
[4] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Dept Orthopaed Surg, Boston, MA USA