Improved implant alignment accuracy with an accelerometer-based portable navigation system in medial unicompartmental kn
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KNEE
Improved implant alignment accuracy with an accelerometer‑based portable navigation system in medial unicompartmental knee arthroplasty Yoshihito Suda1 · Koji Takayama1 · Kazunari Ishida1 · Shinya Hayashi1 · Shingo Hashimoto1 · Takahiro Niikura1 · Takehiko Matsushita1 · Ryosuke Kuroda1 · Tomoyuki Matsumoto1 Received: 12 May 2019 / Accepted: 7 August 2019 © European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2019
Abstract Purpose This study aimed to examine the accuracy of tibial implant alignment using an accelerometer-based portable navigation system in unicompartmental knee arthroplasty (UKA). Methods 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. Results 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
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