Biomedical Engineering Reference
In-Depth Information
d)
Inclined Proximal Porous Coating
The initial B-P proximally coated, collared devices quickly developed resorption of
the calcar under the collar as did other similar designs. Rather than eliminate the
collar and use diaphyseal fixation it was decided to attempt to minimize such
resorption with a collared device. Thus, in 1985 Buechel - Pappas introduced the use
of a slanted proximal coating to prevent stress shielding of the calcar.
The absence of medial porous coating on the B
-
P Femoral Stem allows direct
load transfer from the collar to the calcar producing more physiologic loading than
collarless designs and designs which allow distal fixation. Thus, calcar stress
protection is avoided.
Peak Load Vector
Peak Load Vector
Fig. 5.35
Reduction in Proximal Stress Protection by Inclined Porous Coating
