[Intra-operative shaft fissure--a possible cause of postoperative shaft pain following cement-free hip joint implantation. 2d experimental study].

Two experimental studies carried out at the Institute of Pathology and Bacteriology, Baumgartner Höhe, Vienna, in cooperation with the Department of Orthopaedics of the Centre of Pulmology, City of Vienna, confirm the danger of intraoperative shaft fissures occurring during implantation of cementless hip endoprostheses. It appears that such lesions are not visible either during implantation or on postoperative radiographs. The study was made using the Zweymüller shaft system which is normally implanted at our department. Pain of unknown origin in the shaft area during the phase of patients mobilization may be connected with shaft fissures due to implantation.