Wernecke Gregory C, Harris Ian A, Houang Michael T W, Seeto Bradley G, Chen Darren B, MacDessi Samuel J
Sydney Knee Specialists, Edgecliff, NSW, Australia.
J Orthop Surg (Hong Kong). 2012 Aug;20(2):143-7. doi: 10.1177/230949901202000201.
To compare the extent of tibial bone covered by the tibial tray in 6 most commonly used total knee arthroplasty designs in order to strike a balance between mediolateral cortical fit and optimal tibial component rotation.
In 74 men and 27 women aged 17 to 60 (mean, 32) years with suspected soft-tissue injuries, their magnetic resonance images of the knee in full extension were superimposed with scans of the tibial trays of the 6 designs (one asymmetric and 5 symmetric). The tibial coverage by the tray and any posterolateral/posteromedial overhang/underhang were measured.
All 6 tray designs achieved tibial bone coverage of over 80%. Only 28% of all trays achieved optimal posterolateral fit, whereas 49% had posterolateral overhang enough to cause popliteal tendon impingement. Although the asymmetric tray provided highest tibial coverage (88%), its rates of relative and absolute posterolateral and posteromedial overhang were also highest (64%).
The asymmetric tray provided improved tibial coverage at the expense of posterolateral and posteromedial overhang of the tibial tray.
比较6种最常用的全膝关节置换术设计中胫骨托覆盖胫骨骨的范围，以便在内外侧皮质贴合与胫骨组件最佳旋转之间取得平衡。
对74名男性和27名女性（年龄17至60岁，平均32岁）进行研究，这些人疑似有软组织损伤，将他们膝关节完全伸直时的磁共振图像与6种设计（1种不对称和5种对称）的胫骨托扫描图像叠加。测量胫骨托对胫骨的覆盖情况以及任何后外侧/后内侧的悬垂/不足情况。
所有6种托盘设计的胫骨骨覆盖率均超过80%。所有托盘中只有28%实现了最佳后外侧贴合，而49%的托盘后外侧悬垂足以导致腘肌腱撞击。尽管不对称托盘提供了最高的胫骨覆盖率（88%），但其相对和绝对的后外侧及后内侧悬垂率也最高（64%）。
不对称托盘提高了胫骨覆盖率，但代价是胫骨托盘的后外侧和后内侧出现悬垂。
