Cameron H U
Orthopedic & Arthritic Hospital, Toronto, Ontario, Canada.
Acta Orthop Belg. 1991;57(2):144-6.
In revising knee replacements 3 wear patterns have been noted; severe single facet wear which only occurs when the patella is dislocated or severely tilted, mild single facet wear from contact with the trochlear groove, and double facet wear. Double facet wear can occur when the knee flexes to more than 105-110 degrees, the edges of the patellar component then making contact with the edges of the femoral condyles across the cruciate gap. This double facet wear is potentially serious and may result in the patellar component wearing through.
在翻修膝关节置换手术时，发现了3种磨损模式；严重的单平面磨损仅在髌骨脱位或严重倾斜时出现，与滑车沟接触导致的轻度单平面磨损，以及双平面磨损。当膝关节屈曲超过105 - 110度时会出现双平面磨损，此时髌骨部件的边缘会通过交叉间隙与股骨髁的边缘接触。这种双平面磨损可能很严重，可能导致髌骨部件磨损穿孔。
