[1] Univ Ulm, Dept Orthopaed, Rehabil Krankenhaus, D-89081 Ulm, Germany
[2] Int Osteoporosis Fdn, Mill Valley, CA USA
[3] Hop Tenon, Serv Chirurg Orthoped & Traumatol, F-75970 Paris, France
[4] Hosp Univ Miguel Servet, Serv Cirugia Orthoped & Traumatol, Zaragoza, Spain
[5] Univ Halle Wittenberg, Dept Orthopaed Surg, Halle, Germany
[6] Malmo Gen Hosp, Dept Orthopaed, S-21401 Malmo, Sweden
[7] Lund Univ, Dept Orthopaed, Lund, Sweden
[8] New Zealand Orthopaed Assoc, Wellington, New Zealand
[9] Univ Rome, Dept Orthopaed Surg, Rome, Italy
[10] Univ Edinburgh, Dept Orthopaed, Edinburgh, Midlothian, Scotland
[11] Univ Hosp, Queens Med Ctr, Dept Orthopaed, Nottingham, England