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United States
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Clearance
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.