Influence of manufacturing-related deviations on the junction strength of double modular hip endoprostheses

authored by: Berend Denkena, Beate Legutko, Benjamin Bergmann, Christof Hurschler, Bastian Welke, Ann Katrin Einfeldt
Abstract: Osteoarthritis often requires surgical treatment with joint replacement. By using double modular hip endoprostheses, it is feasible to adapt the femoral angle to the patient and thus improve its biomechanics so that the anatomy of the patient can be better taken into account. Another advantage is that in case of damage of the taper, the stem can be left in the bone and only the neck adapter needs to be replaced. However, these advantages are accompanied by a higher risk of revision due to fretting of the additional connection. Fretting is influenced by angular deviations of the pairing. Therefore, the influence of the manufacturing-related angle deviations on the junction strength of the pairing Ti-6Al-4V ELI/ Ti- 6Al-4V ELI and CoCr28Mo6/ Ti-6Al-4V ELI was investigated. Initially, outer tapers with two different surface topographies and defined angular deviation were manufactured. The tapers were joined with a static force of F_assembly = 4 kN and subsequently the separation forces of the junction and the contact area after push-out tests were investigated. Material-specific differences regarding separation forces were found. The CoCr/Ti pairing shows greater average separation forces than the Ti/Ti pairing, although the resulting contact area of the Ti/Ti pairing is larger than the contact area of the CoCr/Ti. However, the resulting separation forces are independent of the investigated contact cases and the surface topography. This enables the adaption of tolerances within the manufacturing process to ensure the secure utilization of double modular hip endoprostheses.
Organisation(s): Institute of Production Engineering and Machine Tools
External Organisation(s): Hannover Medical School (MHH)
Type: Conference article
Journal: Procedia CIRP
Volume: 125
Pages: 166-171
No. of pages: 6
ISSN: 2212-8271
Publication date: 2024
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Control and Systems Engineering, Industrial and Manufacturing Engineering
Electronic version(s): https://doi.org/10.1016/j.procir.2024.08.029 (Access: Open)

BibTeX

@article{b4678f7263f442c5954c1ebb0766291a,
title = "Influence of manufacturing-related deviations on the junction strength of double modular hip endoprostheses",
abstract = "Osteoarthritis often requires surgical treatment with joint replacement. By using double modular hip endoprostheses, it is feasible to adapt the femoral angle to the patient and thus improve its biomechanics so that the anatomy of the patient can be better taken into account. Another advantage is that in case of damage of the taper, the stem can be left in the bone and only the neck adapter needs to be replaced. However, these advantages are accompanied by a higher risk of revision due to fretting of the additional connection. Fretting is influenced by angular deviations of the pairing. Therefore, the influence of the manufacturing-related angle deviations on the junction strength of the pairing Ti-6Al-4V ELI/ Ti- 6Al-4V ELI and CoCr28Mo6/ Ti-6Al-4V ELI was investigated. Initially, outer tapers with two different surface topographies and defined angular deviation were manufactured. The tapers were joined with a static force of Fassembly = 4 kN and subsequently the separation forces of the junction and the contact area after push-out tests were investigated. Material-specific differences regarding separation forces were found. The CoCr/Ti pairing shows greater average separation forces than the Ti/Ti pairing, although the resulting contact area of the Ti/Ti pairing is larger than the contact area of the CoCr/Ti. However, the resulting separation forces are independent of the investigated contact cases and the surface topography. This enables the adaption of tolerances within the manufacturing process to ensure the secure utilization of double modular hip endoprostheses.",
keywords = "Junction strength, Load-adapted manufacturing, Modular hip endoprostheses, Surface topography",
author = "Berend Denkena and Beate Legutko and Benjamin Bergmann and Christof Hurschler and Bastian Welke and Einfeldt, {Ann Katrin}",
note = "Publisher Copyright: {\textcopyright} 2024 The Authors.; 6th CIRP Conference on BioManufacturing, BioM 2024 ; Conference date: 11-06-2024 Through 13-06-2024",
year = "2024",
doi = "10.1016/j.procir.2024.08.029",
language = "English",
volume = "125",
pages = "166--171",
journal = "Procedia CIRP",
issn = "2212-8271",
publisher = "Elsevier BV",
}