Graydon A J, Malak S, Anderson I A, Pitto R P
Department of Orthopaedic Surgery, Middlemore Hospital, South Auckland Clinical School, University of Auckland, Private Bag 93311, Auckland, New Zealand.
Int Orthop. 2009 Aug;33(4):975-9. doi: 10.1007/s00264-008-0586-z. Epub 2008 May 28.
The objective of this study was to develop a method to assess the accuracy of an electromagnetic technology image-free navigation system for total knee arthroplasty in a leg with normal or abnormal mechanical alignment. An acrylic phantom leg was constructed to simulate tibia and femur deformation. Determination of actual leg alignment was achieved using a digital caliper unit. In the setting of normal alignment, the mean error of the system characterised as the difference between the measured computer navigation and digital caliper angles ranged between 0.8 degrees (frontal plane) and 1.5 degrees (lateral plane). In the setting of abnormal alignment, the mean error ranged between 0.4 degrees (frontal plane) and 1.6 degrees (lateral plane). Deformity had no demonstrable effect on accuracy. The study demonstrates satisfactory in vitro system accuracy in both normal and abnormal leg mechanical alignment settings.
本研究的目的是开发一种方法，以评估用于全膝关节置换术的电磁技术无图像导航系统在具有正常或异常机械对线的腿部中的准确性。构建了一个丙烯酸假体腿来模拟胫骨和股骨变形。使用数字卡尺单元确定实际腿部对线。在正常对线情况下，该系统的平均误差（以测量的计算机导航角度与数字卡尺角度之间的差异表示）在0.8度（额状面）至1.5度（矢状面）之间。在异常对线情况下，平均误差在0.4度（额状面）至1.6度（矢状面）之间。畸形对准确性没有明显影响。该研究表明，在正常和异常腿部机械对线情况下，该系统在体外均具有令人满意的准确性。
