2021 ISAKOS Biennial Congress ePoster
CT Validation of Intraoperative Implant Position and Knee Alignment as Determined by the MAKO Total Knee Arthroplasty System
Christopher J. Wilson, A/Prof, MBChB, MRCS, FRACS, PhD, Adelaide, SA AUSTRALIA
James Sires, MD, Adelaide, SA AUSTRALIA
Flinders Medical Centre, Adelaide, South Australia, AUSTRALIA
FDA Status Cleared
Summary
Robotic-assisted technology in total knee arthroplasty (TKA) aims to increase implantation accuracy. Postoperatively, Perth CT protocol is a valid measurement technique in determining both femoral and tibial component alignments. The aim of this study was to evaluate the accuracy of intraoperative component alignment by robotic-assisted TKA through CT validation.
ePosters will be available shortly before Congress
Abstract
Background
Robotic-assisted technology in total knee arthroplasty (TKA) aims to increase implantation accuracy, with real-time data being used to estimate intraoperative component alignment. Postoperatively, Perth computed tomography (CT) protocol is a valid measurement technique in determining both femoral and tibial component alignments. The aim of this study was to evaluate the accuracy of intraoperative component alignment by robotic-assisted TKA through CT validation.
Methods
total of 33 patients underwent TKA using the MAKO robotic-assisted TKA system. Intraoperative measurements of both femoral and tibial component placements, as well as limb alignment as determined by the MAKO software were recorded. Independent postoperative Perth CT protocol was obtained (n=29) and compared with intraoperative values.
Results
Mean absolute difference between intraoperative and postoperative measurements for the femoral component were 1.17 degrees (1.10) in the coronal plane, 1.79 degrees (1.12) in the sagittal plane, and 1.90 degrees (1.88) in the transverse plane. Mean absolute difference between intraoperative and postoperative measurements for the tibial component were 1.03 degrees (0.76) in the coronal plane and 1.78 degrees (1.20) in the sagittal plane. Mean absolute difference of limb alignment was 1.29 degrees (1.25), with 93.10% of measurements <3 degrees of postoperative CT measurements.
Conclusion
Overall, intraoperatively measured component alignment as estimated by the MAKO robotic-assisted TKA system is comparable to CT-based measurements.