Statistical Shape Modelling the In Vivo Location of Acetabular Wear in Retrieved Hip Implants

Edge-wear in acetabular cups is known to be correlated with greater volumes of material loss; the location of this wear pattern in vivo is less understood. Statistical shape modelling (SSM) may provide further insight into this. This study aimed to identify the most common locations of wear in vivo,...

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Bibliographic Details
Published in:Bioengineering (Basel) 2022-12, Vol.10 (1), p.46
Main Authors: Bergiers, Sean, Henckel, Johann, Hothi, Harry, Di Laura, Anna, Goddard, Chris, Raymont, David, Ullah, Furqan, Cotton, Ross, Bryan, Rebecca, Hart, Alister
Format: Article
Language:English
Subjects:
Acetabular components
Acetabulum
Automation
Bioengineering
Bone implants
Computed tomography
CT imaging
Fins
Geometry
hip replacement
In vivo methods and tests
Inclination
Investigations
Mathematical models
Mean
Medical imaging
Modelling
Pelvis
Quadrants
retrieval analysis
Software
statistical shape modelling
Surgeons
Transplants & implants
Wear
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Summary:Edge-wear in acetabular cups is known to be correlated with greater volumes of material loss; the location of this wear pattern in vivo is less understood. Statistical shape modelling (SSM) may provide further insight into this. This study aimed to identify the most common locations of wear in vivo, by combining CT imaging, retrieval analysis and SMM. Shape variance was described in 20 retrieved metal-on-metal acetabular surfaces. These were revised after a mean of 90 months, from 13 female and seven male patients. They were positioned with a mean inclination and anteversion of 53° and 30°, respectively. Their orientation, in vivo, was established using their stabilising fins, visible in pre-revision CT imaging. The impact of wear volume, positioning, time, gender and size on the in vivo location of wear was investigated. These surfaces had a mean wear volume of 49.63 mm . The mean acetabular surface displayed superior edge-wear centred 7° within the posterosuperior quadrant, while more of the volumetric wear occurred in the anterosuperior quadrant. Components with higher inclination had greater superior edge-wear scars, while a relationship was observed between greater anteversion angles and more posterosuperior edge-wear. This SSM method can further our understanding of hip implant function, informing future design and may help to refine the safe zone for implant positioning.
ISSN:2306-5354
2306-5354
DOI:10.3390/bioengineering10010046