| BUECHEL-PAPPAS™ HIP REPLACEMENT SYSTEM - RESURFACING |
Conservative,
Low Friction, Hip Resurfacing
Advanced
design concepts and technology coupled with more than 25 years
of clinical experience now make surface replacement a truly
conservative procedure.
Basic
Implant Concepts
A resurfacing total hip consists of three matching components.
The size of the components used is governed by the Acetabular
Component size which is determined by the best acetabular
fit. The Bearing Insert and Femoral Component sizes are then
selected to fit the Acetabular Component. This avoids over-reaming
of the acetabulum, common in earlier designs.
A major
mechanical disadvantage of a surface replacement approach
is that the larger head size substantially increases torque
and wear compared to a conventional hip replacement. Recent
studies of UltraCoat titanium nitride (TiN) ceramic coated
titanium on UHMWPe, however, indicate that the articular friction
of a surface replacement head can be reduced below that for
Co-Cr alloy heads. Furthermore, wear in a TiN-UHMWPe system
is only a small fraction of that in a Co-Cr-UHMWPe system.
Thus, all metallic components of the system are made of ceramic
coated titanium alloy. Ceramic coated titanium resurfacing
cups now make hip resurfacing a viable option for the young,
active, patient.
The fixation
surfaces of the components are covered with BioCoat® sintered
bead porous coating with a mean pore size of about 350 microns.
The short tapered femoral stem is uncoated to avoid stress
shielding of the bone.
Femoral resurfacing
component available in 11 sizes are matched to acetabular implants
available in outside diameters from 46 to 70mm, in 2mm increments.
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