LINK PorEx® Surface Modification

LINK PorEx® Surface Modification results in a ceramic like surface which dramitically reduces the release of Co and Ni ions1. In addition, it has a low coefficient of friction vis-à-vis polyethylene (UHMWPE) due to its outstanding hardness, its ceramic-like abrasion behavior, and its wetting angle in contact with liquids2 3 4. All this results in optimized sliding and friction properties for the prosthesis, together with a considerable reduction in wear.

LINK PorEx® is a titanium niobium nitride (TiNbN) hard surface modification which has been in use in Europe for over ten years to offer protection against wear and in orthopedic applications. LINK PorEx® surface modification only contains the elements titanium and niobium, and no chrome or nickel.

Excellent adhesive strength, optimal fatigue strength

In addition to its great strength, biocompatibility5 6 7, high corrosion resistance8 9 and wear protection, LINK PorEx® surface modification is also characterized by pronounced adhesive strength and high fatigue strength10. The thickness of the LINK PorEx® Surface Modification is 4.5 ± 1.5 µm. In terms of hardness, LINK PorEx® achieves values of approx. 2400 HV (0.1 N), compared to around 550 HV (0.1 N) for CoCrMo alloys.

The “golden three” from LINK

LINK PorEx® Surface Modification is available for the LINK® Unicondylar Sled and the LINK® Endo-Model® Standard- and M Knee Prosthesis (including LINK PorEx® coated cemented Modular Stems). All other suitable LINK implants, e.g., Arthrodesis Nails, can be customized with LINK PorEx®.

Solutions for hip patients

LINK has been developing joint implants, made in Germany, for 50 years.

Unicondylar Sled Prosthesis with LINK Porex® surface modification (left)
Endo-Model® – M with LINK Porex® surface modification (center)
Endo-Model® Rotational and Hinge Knee Prosthesis with LINK Porex® surface modification (right)

1: Untersuchung zum Einfluß von TiNbN-Beschichtungen auf die Ionenausgabe von CoCrMo-Legierungen in SBF Puffer nach Simulatorversuch
2: R. M. Streicher, Möglichkeiten der Optimierung von Gleitpaarungen gegen UHMWPE für künstliche Gelenke, Biomed.Technik Band 35, Heft 4/1990
3: M. J. Pappas, Titanium Nitride Ceramic Film against Polyethylene, Clinical Orthopedics Vol. 317,1995
4: Dr. rer. nat. Kremling, Untersuchungen zum tribologischen Verhalten einer Kniegelenkendoprothese mit der Gleitpaarung TiN-Polyethylen im Kniegelenksimulator, Prüfbericht IMA Dresden GmbH
5: R. Thull, K.-D. Handke, E.J. Karle, Examination of Titanium coated with (Ti,Nb)ON and (Ti,Zr)O in an Animal Experiment, Biomedizinische Technik, Band 40, Heft 10/1995
6: J. Eulert, R.Thull Standardised Testing of Bone/ Implant Interfaces using an Osteoblast Cell Culture system, Biomedizinische Technik Band 45 Heft 12/2000
7: Test report Bioserv AG, Analysis of TiNbN in accordance with ISO 10993-5, 2006
8: R. Thull, Corrosion behavior of dental alloys coated with Titanium Niobium Oxinitride, Deutsche Zahnärztliche Zeitschrift 1991 Nov., Universität Würzburg
9: Test report DOT GmbH and Nordum GmbH, Examination of influence of PVD – coatings to the ion release of CoCrMo-alloys in SBF– buffer, 2006
10: A. Wilson, A comparison of the wear and fatigue properties of PVD TiN, CrN and duplex coatings on Ti-6Al-4V, International Conference of Metallurgical Coatings and Thin Films, San Diego 1993


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