Journal article

Publication year: 2019

Pages: 49-54

Journal: Medical Engineering & Physics

Volume number: 67

ISSN: 1350-4533

eISSN: 1873-4030

DOI Link: https://doi.org/10.1016/j.medengphy.2019.03.008

Publisher: Elsevier

Abstract: 

Backround: For preclinical statements about the anchoring behavior of prostheses, the primary stability of the prosthesis is of special importance. It was the aim of this study to examine and compare the relevant relative micromotions of three different acetabulum prostheses by introducing three-dimensional torques.

Methods: The cups were implanted under standard conditions into an anatomical artificial bone model. Three-dimensional torques were applied to the acetabular cups. Taking into account the resulting frictional moments of two different bearing couples, ceramic-on-ceramic and ceramic-on-polyethylene, the relative micromotions of the cups were recorded as maximum total micromotion, translational and rotational micromotion, and the primary stability values of the three cups were compared.

Results: Relative micromotion of all cup models was always significantly smaller with the CoC bearing couples than with the CoP bearing couples (p < 0.001). The rotational micromotion was always lower (p < 0.001) than the translational micromotion, and the rotational as well as the translational micromotions were each always lower than the maximum total micromotion (p < 0.001, p < 0.010). The thinnest-walled cup system always showed the largest relative micromotions.

Conclusion: The results of our study can be interpreted as indicating that the low relative micromotions of all cups - irrespective of the use of CoC or CoP bearing couples - are within an acceptable range favoring secondary osseointegration of the implants. Furthermore, we were able to show that the cup wall thickness and the surface quality of the cup systems have an influence on the primary stability and the elastic deformability of the examined cup systems. (C) 2019 IPEM. Published by Elsevier Ltd. All rights reserved.

Harvard Citation style: Jahnke, A., Bott, C., Ulloa, C., Jahnke, G., Rickert, M., Ishaque, B., et al. (2019) In vitro examination of the primary stability of three press-fit acetabular cups under consideration of two different bearing couples, Medical Engineering & Physics, 67, pp. 49-54. https://doi.org/10.1016/j.medengphy.2019.03.008

APA Citation style: Jahnke, A., Bott, C., Ulloa, C., Jahnke, G., Rickert, M., Ishaque, B., & Ahmed, G. (2019). In vitro examination of the primary stability of three press-fit acetabular cups under consideration of two different bearing couples. Medical Engineering & Physics. 67, 49-54. https://doi.org/10.1016/j.medengphy.2019.03.008