[1] Gundersen Hlth Syst, La Crosse, WI USA
[2] West Virginia Univ, Sch Med, Morgantown, WV 26506 USA
[3] Virginia Commonwealth Univ, Dept Orthoped Surg, Richmond, VA USA
[4] Univ Minnesota, Dept Orthopaed Surg, Minneapolis, MN 55455 USA
[5] Cedars Sinai Kerlan Jobe Inst, Santa Monica, CA USA
[6] Gundersen Hlth Syst, Div Sports Med, La Crosse, WI USA