Titanium Nitride (TiN)
Advanced Coating Technology
The only ceramic surface coating with over ten years’ clinical history – TiN provides the ultimate low wear solution(1,2,3). An innovative surface coating technology, well-established within the orthopaedic industry, TiN allows patients to enjoy the benefits of a ceramic articulation whilst maintaining the strength and flexibility of their metal implant(1,2,3,4).
Titanium nitride (TiN) coating is a biocompatible ceramic layer used on the bearing surfaces of certain implants to form a hard bearing surface for articulation with ultra-high molecular weight polyethylene (UHMWPE).
As a ceramic surface, TiN coating exhibits hardness four times greater than that of cobalt chrome alloys (2400HV for TiN compared to 650HV for CoCr) and low surface roughness (Ra<0.05µm). It has enhanced wettability characteristics with synovial fluids and a low coefficient of friction, minimising polyethylene wear and making it ideal as a bearing surface.
The hard coating also provides protection in the presence of third body wear such as polymeric or cement debris. Its surface scratch resistance prevents implant damage at excessive contact loads. Even on scratch formation the height of the scratch lip is extremely low, resulting in a substantial reduction in wear as opposed to scratched cobalt chrome implants(5,6). TiN ceramic coatings have shown up to 98% reduction in wear against polyethylene in hip simulator studies(6).
TiN surface coatings have also been shown to provide a solution to metal allergy, protecting patients from adverse allergic reactions. The ceramic layer reduces release of metal ions into the patient’s joint space and minimises bacterial proliferation(4,5). Especially for nickel sensitive patients, TiN provides a simple, effective and proven implant solution.
The addition of a TiN coating therefore enables the mechanical properties of the underlying surface to be retained whilst optimising the bearing surface performance, providing a low wear solution and allowing for optimised wear characteristics(2,3,5,6,7).
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