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A new mini-navigation tool allows accurate component placement during anterior total hip arthroplasty

Authors Parvizi J, Benson JR, Muir JM

Received 16 September 2017

Accepted for publication 27 January 2018

Published 22 March 2018 Volume 2018:11 Pages 95—104


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Editor who approved publication: Dr Scott Fraser

Javad Parvizi,1,2 Jessica R Benson,3 Jeffrey M Muir3

1Department of Orthopaedic Surgery, Thomas Jefferson University Hospital, College of Biomedical Science, Philadelphia, PA, USA; 2Orthopaedics, Rothman Institute, Philadelphia, PA, USA; 3Department of Clinical Research, Intellijoint Surgical, Waterloo, ON, Canada

Introduction: Computer-assisted navigation systems have been explored in total hip arthroplasty (THA) to improve component positioning. While these systems traditionally rely on anterior pelvic plane registration, variances in soft tissue thickness overlying anatomical landmarks can lead to registration error, and the supine coronal plane has instead been proposed. The purpose of this study was to evaluate the accuracy of a novel navigation tool, using registration of the anterior pelvic plane or supine coronal plane during simulated anterior THA.
Methods: Measurements regarding the acetabular component position, and changes in leg length and offset were recorded. Benchtop phantoms and target measurement values commonly seen in surgery were used for analysis. Measurements for anteversion and inclination, and changes in leg length and offset were recorded by the navigation tool and compared with the known target value of the simulation. Pearson’s r assessed the relationship between the measurements of the device and the known target values.
Results: The device accurately measured cup position and leg length measurements to within 1° and 1 mm of the known target values, respectively. Across all simulations, there was a strong, positive relationship between values obtained by the device and the known target values (r=0.99).
Conclusion: The preliminary findings of this study suggest that the novel navigation tool tested is a potentially viable tool to improve the accuracy of component placement during THA using the anterior approach.

total hip arthroplasty, computer-assisted navigation, anterior approach, accuracy, anterior pelvic plane, supine coronal plane

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