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J Arthroplasty. 2014 Dec;29(12):2373-7. doi: 10.1016/j.arth.2013.12.010. Epub 2013 Dec 14.

Robot-assisted total knee arthroplasty accurately restores the joint line and mechanical axis. A prospective randomised study.

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Orthopaedic Surgery Department, Singapore General Hospital, Singapore.


Robot-assisted Total Knee Arthroplasty (TKA) improves the accuracy and precision of component implantation and mechanical axis (MA) alignment. Joint-line restoration in robot-assisted TKA is not widely described and joint-line deviation of>5mm results in mid-flexion instability and poor outcomes. We prospectively randomised 60 patients into two groups: 31 patients (robot-assisted), 29 patients (conventional). No MA outliers (>±3° from neutral) or notching was noted in the robot-assisted group as compared with 19.4% (P=0.049) and 10.3% (P=0.238) respectively in the conventional group. The robot-assisted group had 3.23% joint-line outliers (>5mm) as compared to 20.6% in the conventional group (P=0.049). Robot-assisted TKA produces similar short-term clinical outcomes when compared to conventional methods with reduction of MA alignment and joint-line deviation outliers.


ROBODOC; joint line restoration; mechanical axis; robot-assisted total knee arthroplasty; robotic knee surgery

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