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Introduction: Good osteointegration of implants requires sufficient primary stability. Aim of this study was to examine the influence of screw fixation on the primary stability of press-fit cups., Methods: Two press-fit acetabular cups were tested with regard to the influence and number of screws and their primary stability., Results: For the relatively thin-walled Allofit®-S cup, an influence of the number of screws on the different forms of movement could be demonstrated., Conclusions: We see a clear influence of the cup wall thickness on the elastic deformability and accordingly on the primary stability of the examined cups., Competing Interests: The authors declare that they have no conflict of interest., (© 2020 Professor P K Surendran Memorial Education Foundation. Published by Elsevier B.V. All rights reserved.)