Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, 1-4-3 Asahi-machi, Abeno-ku, Osaka, 545-8585, Japan.
Knee Surg Sports Traumatol Arthrosc. 2010 Jun;18(6):718-22. doi: 10.1007/s00167-009-0927-5. Epub 2009 Sep 26.
Use of navigation systems has recently been introduced in total knee arthroplasty (TKA) to achieve more reliable prosthetic alignment. In the sagittal plane, there are two important requirements for navigation systems: (1) perpendicular cut to the femoral mechanical axis and (2) prevention of notching of anterior femoral cortex. These two requirements, however, may conflict. The angles between the line of the anterior femoral cortex and four sagittal femoral mechanical axes for navigation systems using radiographs of the entire lower extremity, while standing were measured and compared. These four sagittal axes simulated on the radiographs in navigation systems were in extension relative to the line of the anterior femoral cortex in 40-85% of cases in male and 65-100% in elderly female. The present study showed that navigation systems have the potential risk for notching of anterior femoral cortex.
近年来，导航系统已被应用于全膝关节置换术（TKA）中，以实现更可靠的假体对线。在矢状面中，导航系统有两个重要的要求：（1）股骨机械轴的垂直截骨和（2）防止前侧股骨皮质切迹。然而，这两个要求可能会发生冲突。我们测量并比较了使用下肢全长 X 线片时导航系统中前侧股骨皮质线与四条矢状面股骨机械轴之间的角度。在男性中，40-85%的情况下，导航系统 X 线片上模拟的这四条矢状轴相对于前侧股骨皮质线处于伸直位，而在老年女性中这一比例为 65-100%。本研究表明，导航系统存在前侧股骨皮质切迹的潜在风险。
