Royal Lancaster Infirmary, Lancaster, United Kingdom.
University Hospital South Manchester, Manchester, United Kingdom.
J Arthroplasty. 2014 Aug;29(8):1658-60. doi: 10.1016/j.arth.2014.03.013. Epub 2014 Mar 21.
We report the accuracy of positioning of the calibration ball in the process of pre-operative templating for total hip arthroplasty (THA). The ball should be placed in the coronal plane of the hip to provide suitable accuracy. We reviewed 112 post-operative THA radiographs where a calibration ball had been placed. We templated the femoral head size of the implant after calibrating the templating system from the ball. The calibrated femoral head diameter was compared to the known prosthetic head size. A percentage error was calculated. Overall, incorrect placement of the calibration ball resulted in a mean percentage error in templating of 6.8% (median 5.7%; range 0-26%). Such error carries implications with the templating process and may result in incorrect component sizes, leg lengths and offset.
我们报告了在全髋关节置换术（THA）术前模板制作过程中校准球定位的准确性。校准球应放置在髋关节冠状面以提供合适的准确性。我们回顾了 112 例术后 THA 射线照片，其中放置了校准球。我们从球校准模板系统后对植入物的股骨头尺寸进行了模板化。校准后的股骨头直径与已知的假体头尺寸进行了比较。计算了百分比误差。总体而言，校准球的不正确放置导致模板制作的平均百分比误差为 6.8%（中位数 5.7%；范围 0-26%）。这种误差对模板制作过程有影响，可能导致组件尺寸、腿长和偏心距不正确。
