Sagittal Cutting Error Changes Femoral Anteroposterior Sizing in Total Knee Arthroplasty
Sagittal Cutting Error Changes Femoral Anteroposterior Sizing in Total Knee Arthroplasty
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DOI：
10.1007/s11999-012-2397-1
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发表时间：
2012-12-01
影响因子：
4.2
通讯作者：
Iwamoto, Yukihide
中科院分区：
文献类型：
--
作者：
Nakahara, Hiroyuki;Matsuda, Shuichi;Iwamoto, Yukihide
背景假体对线和尺寸是实现TKA长期生存的重要因素。尽管已经引入了用于部件尺寸确定的二维和三维（3-D）规划，但是有时难以根据术前规划精确地切割骨。目前还不清楚是否改变股骨远端的矢状面对准影响AP尺寸和大小的准备bone.Questions/Purposes因此，我们确定是否准备股骨远端的AP尺寸增加，如果股骨远端是在延长和减少，如果它是在flexion.Methods削减一百膝关节进行了评估，使用3-D成像软件。当股骨部件垂直于解剖轴对齐时，测量切割表面的AP尺寸。结果股骨后伸3 °和5 °时，股骨前后径分别增加2 mm和3 mm，而前伸3 °和5 °时，股骨后伸3 °和5 °时，股骨前后径分别增加3 mm和2 mm。准备股骨的AP尺寸分别减少了2和3 mm，3度和5度flexions.Conclusions我们的数据表明，如果股骨截骨术在至少3度的伸展或flexions.Level证据等级II，诊断研究中，股骨组件的尺寸增大或减小可能会发生。有关证据等级的完整描述，请参见作者指南。
Background Prosthetic alignment and size are important factors in achieving a long-term survival in TKA. Although two-dimensional and three-dimensional (3-D) planning for component sizing has been introduced, it sometimes is difficult to cut the bones accurately according to preoperative planning. It is unclear whether changing sagittal alignment of the distal femur affects the AP dimension and sizing of the prepared bone.Questions/Purposes We therefore determined whether the AP dimension of the prepared distal femur increases if the distal femur is cut in extension and decreases if it is cut in flexion.Methods One hundred knees were evaluated using 3-D imaging software. The AP dimension of the cutting surface was measured when the femoral component was aligned perpendicular to the anatomic axis. The measurement was repeated when the distal bone cut was planned in flexed positions of 3 degrees and 5 degrees and extended positions of 3 degrees and 5 degrees.Results The AP dimension of the prepared femur was increased by 2 and 3 mm with 3 degrees and 5 degrees extension, respectively. The AP dimension of the prepared femur was decreased by 2 and 3 mm with 3 degrees and 5 degrees flexion, respectively.Conclusions Our data suggest upsizing or downsizing of the femoral component can occur if the femoral osteotomy is performed in at least 3 degrees extension or flexion.Level of Evidence Level II, diagnostic study. See Guidelines for Authors for a complete description of levels of evidence.