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Related Experiment Video

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Electromagnetic Navigation Transthoracic Nodule Localization for Minimally Invasive Thoracic Surgery

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Published on: May 4, 2022

Minimizing electromagnetic interference from surgical instruments on electromagnetic surgical navigation.

Faustin Stevens¹, Michael A Conditt, Nikhil Kulkarni

¹Baylor College of Medicine, Houston, TX, USA.

Clinical Orthopaedics and Related Research

|June 1, 2010

Summary

Metallic objects significantly impact electromagnetic computer-assisted surgery (EM-CAS) accuracy. Keeping surgical instruments like stainless steel items over 10 cm from EM-CAS systems minimizes electromagnetic interference and ensures precision.

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Investigation of the Electrophysiological and Thermographic Safety Parameters of Surgical Energy Devices During Thyroid and Parathyroid Surgery in a Porcine Model

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Published on: October 13, 2022

Area of Science:

Orthopedic Surgery
Medical Device Technology
Surgical Navigation

Background:

Electromagnetic computer-assisted surgery (EM-CAS) systems are susceptible to interference from metallic and ferromagnetic materials.
Ensuring the accuracy of EM-CAS is critical for successful surgical outcomes.

Purpose of the Study:

To quantify the extent of interference metallic objects cause to EM-CAS accuracy.
To identify practical measures for preventing such interference during surgery.

Main Methods:

Standard tibiofemoral position and alignment measurements were performed on a knee surrogate using an EM-CAS system.
Metallic objects (stainless steel mallet, various metal bars) were positioned at varying distances (10 cm) from the EM-CAS stylus and localizer to induce electromagnetic interference.
Experiments were repeated with different metal types and shapes to assess their impact.

Main Results:

Significant errors in varus/valgus alignment, flexion/extension, and resection levels were recorded with metallic objects near the EM-CAS stylus.
Errors were minimized when metallic objects were placed more than 10 cm away from the stylus.
Titanium, cobalt-chrome alloy, and stainless steel cylinders produced the smallest errors.

Conclusions:

The accuracy of EM-CAS systems is substantially influenced by the size, type, proximity, and shape of nearby metal objects.
To maintain accuracy, stainless steel surgical components (e.g., cutting blocks, trial prostheses) should be positioned at least 10 cm away from EM-CAS instruments.