[Total Prosthesis of the Hip: Procedure Using Cement--indications, Technic and Results]

The prosthesis must be adapted to the bone without motoric adaptation. For biomechanical reasons it is necessary to have as large a zone of contact as possible. It is impossible to introduce an "exact size prosthesis". Exact size can be achieved only with cement. The disadvantage of too much elasticity by a thicker cement layer must be compensated by the voluminous metallic implant wedged in the bone marrow. The combination of the osteosynthesis plate, shaft and cement yields a kind of "individual prosthesis". In the long-run the cement is biocompatible. The correct technique of the application of the cement is of utmost importance. 95% success-rate in 373 replacement operations between 1977 and 1985 using the same implant material proves the validity of biomechanical considerations. Allergy as the factor influencing the loosening of the implant can be practically disregarded. Bony defects should be filled out with bone and not with cement.