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Statistical Shape Modelling the In Vivo Location of Acetabular Wear in Retrieved Hip Implants
Sean Bergiers1, Johann Henckel2, Harry Hothi2
1Institute of Orthopaedics and Musculoskeletal Science, University College London, London WC1E 6BT, UK.
Bioengineering (Basel, Switzerland)
|January 21, 2023
Summary
This study used statistical shape modeling to pinpoint wear locations on hip implants. Superior edge-wear was common, influenced by implant positioning, aiding future hip implant design.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Medical Imaging
Background:
- Edge-wear in acetabular cups correlates with material loss, but in vivo locations are poorly understood.
- Statistical shape modeling (SSM) offers a potential method to analyze wear patterns.
- Understanding wear location is crucial for improving hip implant longevity and patient outcomes.
Purpose of the Study:
- To identify the most common in vivo locations of edge-wear in metal-on-metal acetabular cups.
- To investigate the influence of wear volume, implant positioning, and patient factors on wear location.
- To apply statistical shape modeling (SSM) to retrieved acetabular surfaces for wear analysis.
Main Methods:
- Utilized statistical shape modeling (SSM) on 20 retrieved metal-on-metal acetabular surfaces.
- Combined retrieval analysis with CT imaging to determine in vivo orientation.
- Analyzed the impact of wear volume, inclination, anteversion, time, gender, and size on wear patterns.
Main Results:
- Superior edge-wear was identified, centered at 7° within the posterosuperior quadrant.
- Greater volumetric wear occurred in the anterosuperior quadrant.
- Higher implant inclination correlated with increased superior edge-wear; increased anteversion correlated with posterosuperior edge-wear.
Conclusions:
- Statistical shape modeling (SSM) effectively identifies in vivo wear locations on acetabular cups.
- Implant positioning, specifically inclination and anteversion, significantly influences wear patterns.
- Findings can inform future acetabular cup design and refine optimal implant positioning guidelines.
