Unicondylar Knee Arthroplasty (UKA) is a minimally-invasive surgical procedure for treating isolated compartmental knee osteoarthritis. Accurate implant placement is crucial for a successful UKA procedure. Previous work has shown the improvement in UKA by using robotic systems. Here, we present the implant alignment accuracy of a hand-held robotic UKA system compared with a conventional manual UKA system for 12 cadaver specimens. Two surgeons carried out equal number of medial UKAs with robotic UKA on one knee and the manual UKA on the other knee. Preoperative and postoperative computed tomography (CT) scans were obtained for each cadaveric model. The final implant positions were identified in the postoperative CT scan. The implant orientations were compared with the planned implant positions to obtain femoral and tibial implant alignment errors. Our results show that the femoral flexion, varus, and rotation root mean square errors for the robotic and conventional approach were 1.23°, 2.81°, 1.62° and 7.52°, 6.25°, 5.0°, respectively. The tibial slope and varus errors for the robotic and conventional approaches were 2.41°, 2.96° and 4.06°, 1.8°, respectively. We did not find any statistical significant difference (p = .05) in the performance of the two surgeons. We conclude that the hand-held robotic UKA system offers significant improvement in the final implant placement

单con膝关节置换术（UKA）是一种微创外科手术方法，用于治疗孤立的隔室膝关节骨关节炎。正确的植入物放置对于成功的UKA手术至关重要。先前的工作表明使用机器人系统可以改善UKA。在这里，我们介绍了与12个尸体标本的常规手动UKA系统相比，手持式机器人UKA系统的植入物对准精度。两名外科医生用一个机器人的UKA进行相同数量的内侧UKA，而在另一个膝盖上进行了手动UKA。每种尸体模型均获得了术前和术后CT扫描。最终的植入物位置在术后CT扫描中确定。将植入物的方向与计划的植入物位置进行比较，以获得股骨和胫骨植入物的对准误差。我们的结果表明，机器人和常规方法的股骨屈曲，内翻和旋转均方根误差分别为1.23°，2.81°，1.62°和7.52°，6.25°，5.0°。机器人方法和常规方法的胫骨倾斜度和内翻误差分别为2.41°，2.96°和4.06°，1.8°。我们没有发现任何统计上的显着差异（p  = .05）在两位外科医生的表现中。我们得出的结论是，手持式机器人UKA系统在最终植入物放置方面提供了重大改进