How precise is navigation for minimally invasive surgery?

Area of Science:

• Medical technology
• Surgical navigation systems
• Orthopedic surgery

Background:

• Infrared measurement systems are integral to surgical navigation, especially for minimally invasive procedures where visibility is reduced.
• Despite system reliability, residual errors in measurement can affect the overall success of surgical navigation.
• Accuracy and suitability of these systems in daily practice require ongoing evaluation.

Purpose of the Study:

• To empirically evaluate the impact of digitization errors from navigated probes on the accuracy of acetabular cup positioning and orientation.
• To quantify the relationship between probe digitization accuracy and predicted cup placement errors.

Main Methods:

• Performed empirical experiments using a navigated probe to digitize anatomical landmarks.
• Calculated the predicted position and orientation of an acetabular cup based on digitization data.
• Analyzed the effect of a known digitization error (approximately 0.3 mm) on the final predicted cup parameters.

Main Results:

• A digitization accuracy of approximately 0.3 mm with the navigated probe resulted in a potential error of 1.5 mm in the predicted acetabular cup position.
• The same digitization accuracy introduced a potential orientation error of 0.2 degrees in inclination.
• These findings highlight the sensitivity of surgical navigation accuracy to probe digitization precision.

Conclusions:

• Digitization errors in navigated probes significantly impact the accuracy of acetabular cup placement in surgical navigation.
• Statistical methods can be employed to estimate expected accuracy and optimize surgical procedures and testing protocols.
• Understanding and minimizing digitization errors are crucial for enhancing the reliability and success of image-guided orthopedic surgery.