Accuracy of a Simple Digital Templating in Primary Uncemented Total Hip Arthroplasty

Hai-bo Si; Yi Zeng; Fei Cao; Fu-xing Pei; Bin Shen

摘要

Objective To introduce a simple preoperative digital templating in uncemented total hip arthroplasty (THA) and to determine its accuracy for preoperative size selection of the prostheses. Methods A prospective study of digital planned THAs was performed on 90 hips with different types of prostheses from August 2013 to Angust 2014. The plastic templates of different types of prostheses were scanned for desired digital templating and the scanned images were then processed to the transparent, digital templates using Photoshop software. We calibrated the scales of the digital templates with the preoperative radiographs, and then selected the right size of the component. The preoperatively digital planned component sizes were compared to the actual sizes used in the operation, as well as the preoperatively traditional planned sizes. Results In either cup or stem templating, no difference was found among the groups with different types of prostheses, and the accuracy of digital templating was statistically higher than traditional templating. In cup templating, digital planned and implanted cup sizes were identical in 43.33% of the cases, 78.89% of the cup sizes were predicted within 1 size (± 2mm) and 95.56% were predicted within 2 sizes (±4 mm), all significantly higher than the results of traditional planned sizes (30.00%,P=0.044; 61.11%,P=0.007; 82.22%,P=0.004). The exact femoral stem size was predicted in 40.00% of cases using the digital templating, 84.44% of stem sizes were predicted within 1 size, and 93.33% within 2 sizes, better than using traditional templating (25.56%,P=0.028; 53.33%,P<0.001; 77.77%,P=0.003). Conclusion This simple digital preoperative templating is an accurate and reproducible process to preoperatively predict the implant size of uncemented THA.

机译：目的介绍一种简单的术前数字模板化非骨水泥全髋关节置换术（THA），并确定其在术前选择假体尺寸时的准确性。方法从2013年8月至2014年8月，对90种不同类型的假体的髋关节进行数字化THA的前瞻性研究。扫描不同类型的假体的塑料模板以得到所需的数字模板，然后将扫描的图像处理为透明的，使用Photoshop软件的数字模板。我们使用术前X射线照片对数字模板的比例进行了校准，然后选择了合适的组件尺寸。将术前数字化计划的组件大小与手术中使用的实际大小以及术前传统的计划大小进行比较。结果无论是杯型还是干型模板，在使用不同类型假体的组之间均未发现差异，数字模板的准确性在统计学上高于传统模板。在杯模板中，数字计划杯和植入杯的大小在43.33％的情况下是相同的，其中78.89％的杯大小预计在1大小（±2mm）之内，而95.56％的预计在2个大小（±4 mm）之内。高于传统计划规模的结果（30.00％，P = 0.044; 61.11％，P = 0.007; 82.22％，P = 0.004）。使用数字模板可预测40.00％的病例的确切股骨干大小，在1个尺寸以内预测84.44％的茎干大小，在2个尺寸以内预测93.33％的股骨干大小，优于传统模板（25.56％，P = 0.028; 53.33％，P <0.001; 77.77％，P = 0.003）。结论这个简单的数字术前模板是准确，可重复的过程，可在术前预测未胶结THA的植入物尺寸。

Accuracy of a Simple Digital Templating in Primary Uncemented Total Hip Arthroplasty

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