Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan.
Knee Surg Sports Traumatol Arthrosc. 2020 Sep;28(9):2917-2923. doi: 10.1007/s00167-019-05669-y. Epub 2019 Aug 26.
This study aimed to examine the accuracy of tibial implant alignment using an accelerometer-based portable navigation system in unicompartmental knee arthroplasty (UKA).
This retrospective matched case-control study reviewed 51 UKAs performed using an accelerometer-based portable navigation system, matched with 51 UKAs performed using conventional extramedullary rods. Coronal alignment and posterior slope of the tibial implant were measured on postoperative radiographs, and differences from preoperative planning were examined. Outliers and accuracy of tibial implant alignment were compared between the portable navigation and conventional groups using Fisher's exact test and Mann-Whitney U test, respectively.
In the portable navigation group, 100% of the implants were aligned within 3.0° of both target coronal and sagittal implant alignment. In the conventional group, 76.5% and 88.2% of the implants were within 3.0° of both target coronal and sagittal implant alignment. Statistical analysis revealed that outliers of coronal and sagittal alignment were significantly less in the portable navigation group than in the conventional group (P < 0.05). In addition, the absolute value difference between postoperative measurement and preoperative planning of both coronal and sagittal alignment was significantly smaller in the portable navigation group than in the conventional group (P < 0.05).
The portable navigation system improved the accuracy of tibial implant alignment in UKA. We found that 100% of the implants were aligned within 3.0° of both target coronal and sagittal implant alignment. The portable navigation system decreased the outliers of tibial coronal and sagittal alignment.
Retrospective case-control study, Level III.
本研究旨在探讨基于加速度计的便携式导航系统在单髁膝关节置换术（UKA）中测量胫骨假体对线准确性的能力。
本回顾性配对病例对照研究共纳入了 51 例使用基于加速度计的便携式导航系统进行的 UKA 手术，并与 51 例使用传统髓外定位杆的 UKA 手术进行配对。术后 X 线片上测量胫骨假体的冠状位和后倾角，并与术前规划进行比较。使用 Fisher 精确检验和 Mann-Whitney U 检验分别比较了便携式导航组和传统组的胫骨假体对线的离群值和准确性。
在便携式导航组中，100%的假体在冠状位和矢状位目标假体对线的 3.0°范围内。在传统组中，76.5%和 88.2%的假体在冠状位和矢状位目标假体对线的 3.0°范围内。统计分析显示，便携式导航组的冠状位和矢状位对线离群值明显少于传统组（P<0.05）。此外，便携式导航组术后测量与术前规划的冠状位和矢状位对线的绝对值差异明显小于传统组（P<0.05）。
便携式导航系统提高了 UKA 中胫骨假体对线的准确性。我们发现 100%的假体在冠状位和矢状位目标假体对线的 3.0°范围内。便携式导航系统减少了胫骨冠状位和矢状位对线的离群值。
回顾性病例对照研究，III 级。
