The Effect of Clearance on Wear
Clearance is the gap between the head and the cup. This very small difference in size is what pulls in lubrication as the hip moves. The BIRMINGHAM HIP was designed with a clearance proven by a subset of early, clinically successful, large diameter metal-on-metal total hips. These particular implants that were analyzed had worked in patients for a long time before they were removed for loosening or stem fracture. The wear of the components used as a benchmark was extremely low.
The BIRMINGHAM HIP clearance has remained tightly controlled over the years, so that the low wear performance of early BIRMINGHAM Hip implants is maintained in today's implants.
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