The First Generation Metal-on-Metal bearings manufactured in
the 1950s and 1960s were produced by the investment casting process (Ring
and McKee Farrar prostheses). From these devices we have recorded the
longest benign clinical history of cobalt chrome alloys with extremely low
linear wear rates.
The BHR™ is produced using the investment casting process from high carbon
cobalt chrome in the As Cast micro-structural condition.
Wear studies have shown that Cobalt Chrome in its As Cast form has superior
wear resistance to other forms of the alloy.
The BHR™ has a hemispherical cup design with a cast-in
porous ingrowth surface called Porocast™. This ingrowth surface does not
require a heat treatment to attach the beads and therefore preserves the
Clearance is the term used to describe the effective gap
between the femoral head and acetabular cup in a Metal-on-Metal bearing. It
is calculated by subtracting the radius of the …