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Non-invasive navigation in total knee arthroplasty : a validation study.

Harold Jennart, Natacha Gosset, David Zorman

Acta Orthopaedica Belgica

|February 13, 2021

Summary

A handheld navigation system, iAssist, demonstrated satisfactory implant alignment in total knee arthroplasty, comparable to conventional optical navigation systems. This technology shows promise as a viable alternative for surgical procedures.

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Area of Science:

Orthopedic Surgery
Medical Device Technology
Surgical Navigation

Background:

Accurate component alignment is crucial for successful total knee arthroplasty outcomes.
Conventional optical surgical navigation systems are widely used but can be cumbersome.
Handheld navigation devices offer a potentially more streamlined approach to intraoperative guidance.

Purpose of the Study:

To evaluate the intraoperative accuracy of the handheld iAssist navigation system for total knee arthroplasty.
To compare the iAssist system's performance against a conventional optical surgical navigation system.
To assess implant component positioning and alignment using iAssist.

Main Methods:

A prospective study involving sixty-two consecutive patients undergoing total knee arthroplasty.

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iAssist system used for determining implant component positioning.

Orientation of surgical cuts verified with a conventional optical surgical navigation system.

Comparison based on accuracy, outlier percentage, bias, and precision.

Main Results:

Low occurrence of component malalignment was observed with both systems.
No significant differences in accuracy or outlier occurrence were found between iAssist and optical navigation when compared to standard radiography.
Both technologies exhibited small bias and comparable precision.

Conclusions:

The handheld iAssist system provides satisfactory implant alignment in total knee arthroplasty.
iAssist demonstrates comparable accuracy and precision to conventional optical navigation.
iAssist presents a viable alternative to traditional optical navigation systems for total knee arthroplasty.