Haaker R G, Wojciechowski M, Patzer P, Willburger R E, Senkal M, Engelhardt M
Klinik für Orthopädie, Rheumatologie, Traumatologie St.-Vincenz-Hospital, Danziger Strasssse 17, 33034 Brakel, Deutschland.
Orthopade. 2006 Oct;35(10):1073-9. doi: 10.1007/s00132-006-1006-y.
From January 2003 to July 2005 a total of 50 St Georg medial knee monosleds with metal-backed tibial components in stably seated form and Uniglide prostheses (Alphanorm/Corin) with mobile bearing onlays were implanted in minimally invasive operations. Postoperatively the alignment-especially of the tibial components-was investigated, to check whether we had achieved the dorsal slope we had been aiming at, i.e. 5-7 degrees , in the region of these knee replacements.
Before surgery there were initial malalignments of up to 10 degrees varus and 3 degrees valgus. All leg axes were restored to between -3 degrees and +3 degrees . The desired dorsal slope of 5-7 degrees for the knee monosleds relative to the tibial component was realized, the average slope being 5.3 degrees . The a-p alignment of the tibial component and of the femoral component was correct.
Use of the navigation system leads to more accurate and reproducible results in terms of tibial dorsal slope, which is extremely important when these monosleds are used. Overcorrection of the leg axis is generally avoided. The use of too-high medial onlays is also reliably avoided by the navigation system's monitoring of the level of the cut.
2003年1月至2005年7月期间，共有50例患者在微创膝关节置换手术中植入了稳定坐姿形式的带金属背衬胫骨部件的圣乔治内侧膝关节单髁假体，以及仅带有活动衬垫的Uniglide假体（Alphanorm/Corin）。术后对假体的对线情况进行了研究，特别是胫骨部件的对线情况，以检查在这些膝关节置换区域是否达到了我们所期望的5至7度的背侧倾斜度。
术前存在高达10度的内翻和3度的外翻初始对线不良。所有下肢力线均恢复至-3度至+3度之间。膝关节单髁假体相对于胫骨部件实现了5至7度的期望背侧倾斜度，平均倾斜度为5.3度。胫骨部件和股骨部件的前后位对线正确。
在使用这些单髁假体时，导航系统的使用能在胫骨背侧倾斜度方面带来更准确且可重复的结果，这极其重要。通常可避免下肢力线的过度矫正。导航系统对截骨水平的监测也能可靠地避免使用过高的内侧衬垫。
