Havelin, L. I.; Espehaug, B.; Vollset, S. E.; Engesaeter, L. B. Early Failures Among 14,009 Cemented and 1,326 Uncemented Prostheses for Primary Coxarthrosis: The Norwegian Arthroplasty Register, 1987-1992. ActaO 1994, 65, 1-6.