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Accuracy of acetabular component positioning with a fluoroscopically referenced CAOS system
James B Stiehl1, David A Heck, Mark Lazzeri
1Department of Orthopaedic Surgery, Medical College of Wisconsin, Columbia St Mary's Hospital, Milwaukee, Wisconsin, USA. jbstiehl@aol.com
Summary
This study found a fluoroscopic navigation system suitable for guiding acetabular component placement in hip surgery, demonstrating good accuracy and reproducibility for inclination and anteversion. However, anteversion measurements showed more variability, potentially due to challenges in identifying anatomical landmarks on fluoroscopic images.
Area of Science:
- Orthopedic surgery
- Medical imaging
- Surgical navigation systems
Background:
- Accurate acetabular component positioning is crucial for successful total hip arthroplasty.
- Fluoroscopic navigation systems offer potential for improved intraoperative guidance.
- Evaluating the performance of these systems is essential for clinical adoption.
Purpose of the Study:
- To assess the accuracy, repeatability, and reproducibility of a fluoroscopic-referenced navigation system for acetabular component placement.
- To determine the system's suitability for surgical use in guiding cup positioning.
Main Methods:
- The Medtronic StealthStation Treon Plus system was calibrated and validated using a Weber gage block and a cadaveric pelvis.
- Repeatability and reproducibility were assessed by surgeons using the system on a cadaveric model.
- A coordinate measuring machine (CMM) provided a baseline measurement for comparison.
Main Results:
- The system demonstrated a mean bias of 0.69 mm in linearity assessments.
- Repeatability and reproducibility measurements for inclination and anteversion were within a +/-5 degree acceptability range.
- While generally accurate, anteversion measurements exhibited greater variability compared to inclination.
Conclusions:
- The fluoroscopic referencing method is accurate and reproducible enough for surgical guidance of acetabular component positioning.
- Increased variability in anteversion measurements may stem from difficulties in identifying anatomical landmarks on fluoroscopic images.
- The system shows promise for enhancing surgical precision in hip arthroplasty.