Biomedical Engineering Reference
In-Depth Information
The value of the contact stress in the lateral condyle of the Partially
Conforming Bearing is, however, a fraction of the values found in typical
incongruent bearings. Thus, the Partially Conforming Bearing is more resistant to
wear and other effects of load and motion than typical fixed bearing knees.
6.6.3.3 Revision Components
The B-P Mark V Knee modular revision components are used with stem
extensions to provide additional stability where there is insufficient bone stock or
other deficiency as shown in Fig. 6.4.
The stem connection is reliable, easy to use and clinically proven in more than
a decade of use in B-P modular hip stem components. It avoids the potential for
loosening and micro motion present in typical taper stem connections and the
associated problems of micro motion and metallic wear debris by a connection
that avoids micromotion.
Fig. 6.64
B-P Mark V Knee Modular Revision Components
6.6.3.4 B-P Hinge Knee
Primary load bearing of the B-P Mark II Hinge Knee is carried by the tibiofemoral
articulating surfaces and not by the hinge element as it is in other hinge knee
designs. This allows for the use of a relatively small hinge which needs only to
