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Technical Brief

Force and Contact Location Measurement Errors of the VERASENSE

[+] Author and Article Information
Stephanie J Nicolet-Petersen

Biomedical Engineering Graduate Group, University of California, Davis, 4635 2nd Ave (Building 97), Sacramento, CA 95817
sjpetersen@ucdavis.edu

Stephen M. Howell

Department of Biomedical Engineering, University of California, Davis, 4635 2nd Ave (Building 97), Sacramento, CA 95817
sebhowell@mac.com

Maury Hull

Department of Mechanical Engineering, Department of Biomedical Engineering, and Department of Orthopaedic Surgery, University of California, Davis, 4635 2nd Ave (Building 97), Sacramento, CA 95817
mlhull@ucdavis.edu

1Corresponding author.

ASME doi:10.1115/1.4040601 History: Received October 19, 2017; Revised June 05, 2018

Abstract

Background: The OrthoSensor VERASENSE knee system is a commercially available instrumented tibial insert that provides real-time intraoperative measurements of tibial contact force and contact location to guide surgeons toward improving outcomes in total knee arthroplasty (TKA). However, the device has been used contrary to the manufacturer's recommendations in several studies and lacks published accuracy data. Therefore, the primary objectives of this study were to evaluate the device's error in tibial contact force when used according to and contrary to the manufacturer's recommendations, and also to evaluate the device's error in anterior-posterior (A-P) and medial-lateral (M-L) contact locations. Methods: The error in tibial contact force in single compartment distributed loading was evaluated by applying known forces in ranges within and exceeding that recommended by the manufacturer, with rezeroing as recommended by the manufacturer, and without rezeroing. The error in tibial contact location in single compartment concentrated loading was evaluated by applying known forces at known locations on the articular surface. Results: Exceeding the maximum allowable load and not rezeroing did not adversely affect the bias (i.e. average error) (p > 0.05). The maximum absolute bias without rezeroing was 2.9 lbf. Rezeroing more than doubled the bias. The maximum root mean squared error in tibial contact location was 1.5 mm in the A-P direction. Conclusion: The device measures tibial contact force with comparable error well above the maximum allowable load and without rezeroing, contrary to the manufacturer's instructions.

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