BACKGROUND Inaccurate meniscus allograft size is still an important problem of the currently used sizing methods. The purpose of this study was to evaluate a new three-dimensional (3D) meniscus-sizing method to increase the accuracy of the selected allografts. METHODS 3D triangular surface models were generated from 280 menisci based on 50 bilateral and 40 unilateral knee joint magnetic resonance imaging (MRI) scans. These models served as an imaginary meniscus allograft tissue bank. Meniscus sizing and allograft selection was simulated for all 50 bilateral knee joints by (1) the closest mean surface distance (MeSD) (3D-MRI sizing with contralateral meniscus), (2) the smallest meniscal width/length difference in MRI (2D-MRI sizing with contralateral meniscus), and (3) conventional radiography as proposed by Pollard (2D-radiograph (RX) sizing with ipsilateral tibia plateau). 3D shape and meniscal width, length, and height were compared between the original meniscus and the selected meniscus using the three sizing methods. RESULTS Allograft selection by MeSD (3D MRI) was superior for all measurement parameters. In particular, the 3D shape was significantly improved (p < 0.001), while the mean differences in meniscal width, length, and height were only slightly better than the allograft selected by the other methods. Outliers were reduced by up to 55% (vs. 2D MRI) and 83% (vs. 2D RX) for the medial meniscus and 39% (vs. 2D MRI) and 56% (vs. 2D RX) for the lateral meniscus. CONCLUSION 3D-MRI sizing by MeSD using the contralateral meniscus as a reconstruction template can significantly improve meniscus allograft selection. Sizing using conventional radiography should probably not be recommended. TRIAL REGISTRATION Kantonale Ethikkommission Zürich had given the approval for the study (BASEC-No. 2018-00856).

中文翻译：

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三维半月板同种异体移植的尺寸研究-280例健康半月板的研究。

背景技术同种异体的半月板异体尺寸仍然是当前使用的施胶方法的重要问题。这项研究的目的是评估一种新的三维（3D）弯月面尺寸确定方法，以提高所选同种异体移植的准确性。方法基于50个双边和40个单侧膝关节磁共振成像（MRI）扫描，从280个弯月面生成3D三角形表面模型。这些模型用作假想的半月板异体移植组织库。通过（1）最接近的平均表面距离（MeSD）（对侧半月板的3D-MRI尺寸），（2）MRI中最小的半月板宽度/长度差异（2D-对侧半月板的MRI尺寸调整），（3）Pollard提出的常规放射线照相（2D放射线照相术（RX）尺寸为患侧胫骨平台）。使用三种尺寸调整方法比较了原始弯月面和选定弯月面的3D形状和弯月面宽度，长度和高度。结果通过MeSD（3D MRI）进行的同种异体移植物在所有测量参数上均表现出色。特别是3D形状得到了显着改善（p <0.001），而半月板宽度，长度和高度的平均差异仅比其他方法选择的同种异体移植稍好。内侧半月板的异常值减少了55％（vs. 2D MRI）和83％（vs. 2D RX），外侧半月板减少了39％（vs. 2D MRI）和56％（vs. 2D RX）。结论MeSD使用对侧半月板作为重建模板的3D-MRI尺寸可显着改善半月板同种异体移植的选择。不建议使用常规放射线照相术进行尺码调整。试验注册Kantonale EthikkommissionZürich已批准该研究（BASEC-No。2018-00856）。