* Departments of Surgery, University of Turku, Turku, Finland
**Medical Microbiology, University of Turku, Turku, Finland
Reprint requests to Hannu Aro, M.D., Department of Surgery, University of Turku, SF-20520 Turku 52, Finland.
Presented in part on June 11–13, 1980, at the 40th Congress of the Nordic Orthopaedic Society, Helsinki, Finland and on June 15–19, 1980, at the XV European Symposium on Calcified Tissues, Helsinki, Finland.
Supported by the Paulo Foundation and by the Finnish Orthopaedic Association.
Received: February 17, 1981.