The Significance of the Torque Loading of the Total Hip Prosthesis

Abstract

It is generally known that total hip replacements (THR), an-choraged by the bone cement, are successfully subjected to immediate postoperative loading. On the other hand the primary stability of non-cemented types of hip joint prostheses is still differently estimated, as demonstrated in various forms of the after-treatment concepts. Thus some authors allow the instantaneous unrestricted loading, others a partial loading and others again a temporary release of the affected leg (for example Judet, 1979; Bombelli, 1983; Mittelmeier, 1984 and others). The self and force closed mechanisms of a non-cemented hip joint prosthesis are but to a different extent less in comparison to those of a cemented hip. In the case under discussion, comparative investigations for the primary stability of a cemented and non-cemented hip joint prosthesis are carried out, which are of importance for the carrying capacity in the final stages of recovery.