Abstract
Introduction
There have been many attempts to reduce the risk of femoral component loosening.
Using a tapered stem having a highly polished stem surface results in stem stabilization subsequent to debonding and stem-cement taper-lock and is consistent with force-closed fixation design.
Purpose
In this study, we assessed the subsidence of two different polished triple tapered stems and two different cements in primary THA.
Materials and methods
From March 2013 to March 2014, two kinds of polished triple tapered cemented stem were applied in 74 primary THA. 12 male, 62 female, mean age at surgery was 68 years old, mean F/U time was 12months.
When they were compared by stems, this study comprises 35 THA with Trilliance stem(Aesculap, Germany) and 39 THA with SC stem (Kyocera, Japan), and when they were compared by cements, this study comprises 36 Simplex cement (Stryker, USA) cases and 38 Cobalt cement(Biomet, USA) cases. Using digitized x-ray, we measured the subsidence of each implants. Measurements were taken from initial postoperative radiographs to the final follow-up. We also evaluated the existence of radiolucent line between cement and stem and also evaluated calcar resorption.
Results
The mean subsidence of Trilliance stem was 0.26mm and of SC stem was 0.44mm at 12months.(P<0.0001) Statistic significance was observed between the stems.
When compared between 2 cements, the mean subsidence of Simplex cement was 0.25mm and of Cobalt cement was 0.48mm.(P=0.0563). No statistic significance was observed. There was no case of stem loosening and calcar resorption.
Conclusion
2 different designed cemented triple taper stems showed significantly different degree of subsidence after THA.
No difference of subsidence was observed between two cements.
