인공 슬관절 전치환술에서 두가지 슬개삽입물의 비교 = Comparison of the Two Types of Patellar Component in Total Knee Arthroplasty

다국어 초록 (Multilingual Abstract)

The displacement of patellar components, such as dislocation or subluxation, causes
polyethylene wear and further induces metallosis of the metal-backed patella. We
compared two different patellar components, onset(Miller-Galante I) and
inset(Whiteside-Ortholoc I)type, to understand the differences in patellar tracking
according to their designs. Patellar prosthesis position in 43 primary total knee
arthroplasties was evaluated with patellar tilt, patellar displacement from the center of
the trochlear groove, medial placement, patellar thickness, and joint line height. For the
MG(Miller-Galante I)group, the patellar displacement was laterally 50.0% and for the
Ortholoc group, it was 33.3%. In the MG group, 4 cases of revision of the patellar
component due to excessive polyethylene wear were performed, but there was no
excessive wear of polyethylene in Ortholoc group. One of the primary factors which
influence tracking of the patellofemoral joint is the difference in design between the
patellar component and the femoral component. But in the opinion of the authors, the
slope or lateral displacement of the patellar component have no correlation with each
other under radiological measurements. However, the inset-type patellar component is a
design that maintains the bony flange within the lateral flange, therefore relieving the
shear stress and rotational forces loaded on the patellofemoral joint and protecting the
metal-backing from exposure. Thereby, even if dislocation or subluxation of the patellar
component should occur, polyethylene wear or metallosis caused by excessive wearing
can be minimal.