Reference Axes for Tibial Component Rotation in Total Knee Arthroplasty Computed Tomography-Based Study of 1,351 Tibiae

被引:3
作者
Jang, Eugene S. [1 ]
Davignon, Robert [2 ]
Geller, Jeffrey A. [1 ]
Cooper, H. John [1 ]
Shah, Roshan P. [1 ]
机构
[1] Columbia Univ, Dept Orthopaed Surg, Med Ctr, New York, NY 10027 USA
[2] Stryker Orthopaed, Mahwah, NJ USA
关键词
TRANSEPICONDYLAR AXIS; ALIGNMENT; VARIABILITY; TKA;
D O I
10.2106/JBJS.22.00520
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
Background:Many anatomic landmarks have been described for setting tibial component rotation intraoperatively. There is no consensus as to which axis is best for reducing outliers and preventing malrotation.Methods:The SOMA (Stryker Orthopaedic Modeling and Analytics) database (Stryker) was used to identify 1,351 computed tomography (CT) scans of the entire tibia. Several reference axes for the tibia (including the Mayo axis, Akagi line, Insall line, anterior condylar axis [ACA], posterior condylar axis [PCA], lateral tibial cortex [LTC], Cobb axis, tibial crest line [TCL], and transmalleolar axis [TMA]) were constructed according to published guidelines. The Berger method served as the reference standard.Results:The Mayo method (involving a line connecting the medial and middle one-thirds of the tibial tubercle and the geometric center of the tibia) and the Insall line (involving a line connecting the posterior cruciate ligament [PCL] insertion and the intersection of the middle and medial one-thirds of the tibial tubercle) both had low variability relative to the Berger method (7.8 degrees +/- 1.0 degrees and 5.1 degrees +/- 2.2 degrees, respectively) and a low likelihood of internal rotation errors (0.7% and 1.8%, respectively). No clinically significant gender-based differences were found (<0.7 degrees for all). The same was true for ethnicity, with the exception of consistently greater tibial intorsion in Asian versus Caucasian individuals (mean difference in TCL position, +4.5 degrees intorsion for Asian individuals; p < 0.001).Conclusions:This CT-based study of 1,351 tibiae (which we believe to be the largest study of its kind) showed that the Mayo and Insall methods (both of which reference the medial and middle one-thirds of the tibial tubercle) offer an ideal balance of accuracy, low variability, and a reduced likelihood of internal rotation errors. Setting rotation on the basis of distal landmarks (tibial shaft and beyond) may predispose surgeons to substantial malrotation errors, especially given the differences in tibial torsion found between ethnic groups in this study.
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页码:1 / 8
页数:8
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