AI Article Synopsis
- The study aimed to create a hybrid navigation system that helps with acetabular reorientation during peri-acetabular osteotomy (PAO).
- The system uses a tracking unit on the pelvis, an augmented marker on the acetabular fragment, and a computer for processing the data, combining video feed and orientation measurements with a Kalman filter for accuracy.
- Validation results showed the new system has very small differences in measurement accuracy compared to existing methods, confirming its effectiveness for real-world applications.
Article Abstract
Objective: To develop a hybrid augmented marker-based navigation system for acetabular reorientation during peri-acetabular osteotomy (PAO).
Methods: The system consists of a tracking unit attached to the patient's pelvis, augmented marker attached to the acetabular fragment and a host computer to do all the computations and visualization. The augmented marker is comprised of an external planar Aruco marker facing toward the tracking unit and an internal inertial measurement unit (IMU) to measure its orientation. The orientation output from the IMU is sent to the host computer. The tracking unit streams a live video of the augmented marker to the host computer, where the planar marker is detected and its pose is estimated. A Kalman filter-based sensor fusion combines the output from marker tracking and the IMU. We validated the proposed system using a plastic bone study and a cadaver study. Every time, we compared the inclination and anteversion values measured by the proposed system to those from a previously developed optical tracking-based navigation system.
Results: Mean absolute differences for inclination and anteversion were 1.34 ([Formula: see text]) and 1.21 ([Formula: see text])[Formula: see text], respectively, for the cadaver study. Mean absolute differences were 1.63 ([Formula: see text]) and 1.55 ([Formula: see text])[Formula: see text] for inclination and anteversion for the plastic bone study. In both validation studies, very strong correlations were observed.
Conclusion: We successfully demonstrated the feasibility of our system to measure the acetabular orientation during PAO.
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| http://dx.doi.org/10.1007/s11548-017-1690-6 | DOI Listing |
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