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Roller Hardening

Roller Hardening

Added Strength in Revision Hip Arthroplasty

The use of a modular junction is required for a hip system that allows for modularity. However, taper junction fracture remains a concern. The industry has been challenged with developing a durable modular stem that is comparable to the strength of a one-piece design. The Arcos® Modular Femoral Revision System has been designed to address strength by encompassing Biomet’s patented roller hardening technology, a proprietary process that is critical to the clinical success of the implant. Roller hardening, developed by Biomet in 2000, is a manufacturing process that increases durability while reducing the risk of fracture. Compressing or “work hardening” the Morse-type taper helps to achieve optimal strength of the titanium alloy metal at the interface of the taper junction, resulting in fretting resistance,1 while significantly increasing fatigue strength of the modular distal stem.
In mechanical testing, the roller hardening process triples the endurance limit of the taper junction.

1 This manufacturing process reduces the risk of taper fracture compared to a machined-only taper (Figure 2).1 Over the last 11 years, more than 20,000 Biomet roller hardened modular stems have been implanted with only one reported taper fracture,2 resulting in a 99.9% clinical survivorship. The incorporation of the roller hardening process into Arcos® Modular Femoral Revision System taper design increases durability while reducing the risk of fracture.