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Open AccessArticle

Experimental Characterization of the Primary Stability of Acetabular Press-Fit Cups with Open-Porous Load-Bearing Structures on the Surface Layer

1
Faculty of Engineering, University of Applied Science, Technology, Business and Design, Philipp-Müller-Str. 14, 23966 Wismar, Germany
2
Biomechanics and Implant Technology Research Laboratory, Department of Orthopedics, Rostock University Medicine, Doberaner Strasse 142, 18057 Rostock, Germany
3
Institute for Polymer Technologies e.V., Alter Holzhafen 19, 23966 Wismar, Germany
*
Author to whom correspondence should be addressed.
Metals 2018, 8(10), 839; https://doi.org/10.3390/met8100839
Received: 27 September 2018 / Revised: 16 October 2018 / Accepted: 16 October 2018 / Published: 17 October 2018
(This article belongs to the Special Issue Titanium Alloys for Biomedical Implants and Devices)
Background: Nowadays, hip cups are being used in a wide range of design versions and in an increasing number of units. Their development is progressing steadily. In contrast to conventional methods of manufacturing acetabular cups, additive methods play an increasingly central role in the development progress. Method: A series of eight modified cups were developed on the basis of a standard press-fit cup with a pole flattening and in a reduced version. The surface structures consist of repetitive open-pore load-bearing textural elements aligned right-angled to the cup surface. We used three different types of unit cells (twisted, combined and combined open structures) for constructing of the surface structure. All cups were manufactured using selective laser melting (SLM) of titanium powder (Ti6Al4V). To evaluate the primary stability of the press fit cups in the artificial bone cavity, pull-out and lever-out tests were conducted. All tests were carried out under exact fit conditions. The closed-cell polyurethane (PU) foam, which was used as an artificial bone cavity, was characterized mechanically in order to preempt any potential impact on the test results. Results and conclusions: The pull-out forces as well as the lever moments of the examined cups differ significantly depending on the elementary cells used. The best results in pull-out forces and lever-out moments are shown by the press-fit cups with a combined structure. The results for the assessment of primary stability are related to the geometry used (unit cell), the dimensions of the unit cell, and the volume and porosity responsible for the press fit. Corresponding functional relationships could be identified. The findings show that the implementation of reduced cups in a press-fit design makes sense as part of the development work. View Full-Text
Keywords: Ti6Al4V; selective laser melting; mechanical characterization; press-fit; primary stability Ti6Al4V; selective laser melting; mechanical characterization; press-fit; primary stability
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Weißmann, V.; Boss, C.; Schulze, C.; Hansmann, H.; Bader, R. Experimental Characterization of the Primary Stability of Acetabular Press-Fit Cups with Open-Porous Load-Bearing Structures on the Surface Layer. Metals 2018, 8, 839.

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