Olsen M, Davis E T, Chiu M, Gamble P, Tumia N, Boyle R A, Schemitsch E H
Division of Orthopaedic Surgery, St. Michael's Hospital, University of Toronto, Toronto, Ontario, Canada.
J Bone Joint Surg Br. 2009 Oct;91(10):1281-6. doi: 10.1302/0301-620X.91B10.22020.
The computed neck-shaft angle and the size of the femoral component were recorded in 100 consecutive hip resurfacings using imageless computer-navigation and compared with the angle measured before operation and with actual component implanted. The reliability of the registration was further analysed using ten cadaver femora. The mean absolute difference between the measured and navigated neck-shaft angle was 16.3 degrees (0 degree to 52 degrees). Navigation underestimated the measured neck-shaft angle in 38 patients and the correct implant size in 11. Registration of the cadaver femora tended to overestimate the correct implant size and provided a low level of repeatability in computing the neck-shaft angle. Prudent pre-operative planning is advisable for use in conjunction with imageless navigation since misleading information may be registered intraoperatively, which could lead to inappropriate sizing and positioning of the femoral component in hip resurfacing.
在连续100例使用无影像计算机导航的髋关节表面置换手术中，记录计算得出的颈干角和股骨假体的尺寸，并与术前测量的角度以及实际植入的假体进行比较。使用10具尸体股骨进一步分析配准的可靠性。测量的颈干角与导航得出的颈干角之间的平均绝对差值为16.3度（0度至52度）。在38例患者中，导航得出的颈干角低于测量值，在11例患者中，导航得出的假体尺寸不正确。尸体股骨的配准往往高估了正确的假体尺寸，并且在计算颈干角时重复性较差。建议在使用无影像导航的同时进行谨慎的术前规划，因为术中可能会记录到误导性信息，这可能导致髋关节表面置换术中股骨假体尺寸选择不当和位置不佳。
