Clarius M, Mohr G, Jaeger S, Seeger J B, Bitsch R G
Department of Orthopaedic Surgery, University of Heidelberg, Schlierbacher Landstrasse 200a, 69118 Heidelberg, Germany.
Knee. 2010 Dec;17(6):398-402. doi: 10.1016/j.knee.2009.11.006. Epub 2009 Dec 14.
Femoral component loosening is a rare but serious complication in cemented Oxford unicompartmental knee arthroplasty (OUKA). In a cadaver study, OUKA was performed in 24 knees to evaluate the femoral fixation pattern. Due to the geometry of bone and implant, three different zones were identified. Complete cement mantles and good interdigitation were found in the spherical part of the implant (zone 1) and around the peg (zone 3), which implies that these are most important for implant fixation. The posterior plane facet (zone 2) is the weak point of the interface due to incompleteness of the cement mantle and a lack of interdigitation. This study suggests that the cancellous bone in zone 2 and the drill holes in sclerotic bone areas should be filled with cement and pressurised prior to component seating.
股骨部件松动是骨水泥型牛津单髁膝关节置换术（OUKA）中一种罕见但严重的并发症。在一项尸体研究中，对24个膝关节进行了OUKA手术以评估股骨固定模式。由于骨骼和植入物的几何形状，确定了三个不同区域。在植入物的球形部分（区域1）和栓钉周围（区域3）发现了完整的骨水泥套和良好的相互交错，这意味着这些对植入物固定最为重要。后平面小关节（区域2）由于骨水泥套不完整和缺乏相互交错而成为界面的薄弱点。本研究表明，在部件就位前，应使用骨水泥填充区域2的松质骨和硬化骨区域的钻孔并进行加压。
