Osteoarthrosis Clinical Trial
Official title:
Early Stability of the Delta-TT Cup With Polyethylene Insert Compared to the Delta-TT Cup With Ceramic Insert. A Randomised RSA Study
The goal of this study is to study the stability of the Delta-TT cup with polyethylene insert and the Delta-TT cup with ceramic insert both combined with the H-MAX femoral stem by means of RSA to assess whether the differences in stiffness of the cup will have an influence on incorporation and mechanical stability. It is hypothesized that there will be more micromotion on the short-term (<2 years) in the patients with the ceramic insert because of the higher stiffness, however, all components will be considered stable on the short and long-term.
Rationale: Roentgen Stereophotogrammetric Analysis (RSA) is a very accurate measurement technique used to obtain micromotion of the implants relative to inserted tantalum markers in the surrounding bone. Using RSA, long-term predictions of prosthetic loosening can be made based on a two years follow-up. Therefore, it is recommended to analyse all (new) prosthetic components by means of RSA. Objective: The goal of this study is to study in a randomised trial the stability of the Delta-TT cup with polyethylene insert and the Delta-TT cup with ceramic insert both combined with the H-MAX femoral stem by means of RSA to assess whether the differences in stiffness of the cup will have an influence on incorporation and mechanical stability. It is hypothesized that there will be more micromotion on the short-term (<2 years) in the patients with the ceramic insert because of the higher stiffness, however, all components will be considered stable on the short and long-term. Secondary goal is to compare the stability of the C2 femoral stem, to the H-MAX femoral stem as well as to compare it to relevant migration results of similar stems from the literature. These RSA results will contribute to knowledge about the early stability and long-term prosthetic loosening of these cementless stems. ;
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