AI Article Synopsis
- Computer navigation, specifically using a robotic system, enhances the accuracy of total knee arthroplasty (TKA) by improving implant placement compared to traditional methods.
- In a study involving 173 knees, measurements of alignment (like femoral and tibial angles) were taken and compared between navigated cuts and post-operative CT scans to assess accuracy.
- Results indicated that the robotic navigation system achieved high accuracy for femoral and tibial coronal alignment, with slightly less precision for femoral sagittal alignment and hip-knee-ankle angles.
Article Abstract
Background: Computer navigation increases reproducibility compared to non-navigated total knee arthroplasty (TKA). Robotics navigation is a branch of computer navigation technology that might further improve accuracy of implant placement. The aim of this study is to assess the accuracy achieved in TKA with a robotic navigation system.
Methods: One hundred seventy three knees. System studied: Omni navigation System (OMNI, Raynham, MA). Navigated femoral and tibial cuts were compared to postoperative computed tomography (CT). Measurements reviewed: femoral coronal alignment (FCA), femoral sagittal alignment (FSA), femoral rotational alignment (FRA), tibial coronal alignment (TCA), tibial sagittal alignment (TSA) and hip-knee-ankle (HKA) angle. Statistical analysis was made using R.
Results: The mean differences between the navigated reported and the CT positions were: FCA: 0.1 ± 1.2° more varus (P = 0.58), FSA: 1.5 ± 0.3° more flexed (P < 0.001), FRA: 0.0 ± 1.7° (P = 0.93), TCA: 0.7 ± 1.1° more varus (P < 0.001), TSA: -1.3 ± 1.5 more negative slope (P < 0.001), HKA angle: 0.4 ± 2.4 more varus (P < 0.049). The percentages of concordance inside a three degree difference were: FCA: 98% (169 knees), FSA: 100% (173 knees), FRA: 94% (162 knees), TCA: 99% (171 knees), TSA: 93% (161 knees) and HKA angle: 83% (144 knees).
Conclusions: The current study showed that the robotic navigation system studied is highly accurate regarding final implant positioning for FCA, FRA and TCA. It has less accuracy in FSA, TSA and the HKA angle.
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| http://dx.doi.org/10.1016/j.knee.2019.05.004 | DOI Listing |
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