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Radial mismatch of the femoral head to the acetabular component
8%
67/815
Sphericity of the bearings
66/815
Surface finish of the articulation
5%
44/815
Carbon content of the metal-on-metal bearing
20%
159/815
Head-to-neck ratio
58%
476/815
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Wear in total hip arthroplasty is a very complex phenomenon. The radial mismatch of the femoral head to the acetabular component has been shown in multiple studies to be a significant factor in wear. The mismatch can neither be too small nor too large. When the mismatch is too small, seizing of the implants can occur. When the mismatch is too large, contact stresses increase and produce exceptionally high wear. The ideal radial mismatch should be approximately 50 microns. Surface roughness and ball sphericity are two items that are extremely important with respect to wear. High carbon content has been shown to decrease wear. This device has a very large head-to-neck ratio, so impingement-related wear is unlikely.
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