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Symmetry matching of the medial acetabular surface - A quantitative analysis in view of patient specific implants


Osterhoff, Georg; Petersik, Andreas; Sprengel, Kai; Pape, Hans-Christoph (2019). Symmetry matching of the medial acetabular surface - A quantitative analysis in view of patient specific implants. Journal of Orthopaedic Trauma, 33(3):e79-e83.

Abstract

OBJECTIVE To quantify intrapelvic surface symmetry in reference to a pre-shaped suprapectineal acetabular implant. METHODS In this cross-sectional study, an anatomically pre-shaped acetabular fracture implant was fitted on 3D surface models of 516 pelvises from a pre-existing bone database using a software tool for automated implant fitting (SOMA, Stryker Orthopaedic Modeling and Analytics) of a CAD model of the implant. The distances between bone and the reference implant were measured at 2310 reference points for each hemipelvis. RESULTS The average distance between the left hemipelvis and the plate was 1.98 mm (median, 10% percentile: 1.45, 90% percentile: 2.78) and 2.0 mm (median, 10% percentile: 1.45, 90% percentile: 2.92) between the right hemipelvis and the plate. There was no significant difference between the two hemipelvises (medianabsolute pairwise delta: 0.25mm; 10% percentile: 0.04, 90% percentile: 0.82; Wilcoxon, p = 0.064). CONCLUSION With regard to the periacetabular surface of the inner pelvis, the pelvis can be considered sufficiently symmetric for using the mirrored contralateral hemipelvis as a template for patient-specific implants in acetabular fracture fixation.

Abstract

OBJECTIVE To quantify intrapelvic surface symmetry in reference to a pre-shaped suprapectineal acetabular implant. METHODS In this cross-sectional study, an anatomically pre-shaped acetabular fracture implant was fitted on 3D surface models of 516 pelvises from a pre-existing bone database using a software tool for automated implant fitting (SOMA, Stryker Orthopaedic Modeling and Analytics) of a CAD model of the implant. The distances between bone and the reference implant were measured at 2310 reference points for each hemipelvis. RESULTS The average distance between the left hemipelvis and the plate was 1.98 mm (median, 10% percentile: 1.45, 90% percentile: 2.78) and 2.0 mm (median, 10% percentile: 1.45, 90% percentile: 2.92) between the right hemipelvis and the plate. There was no significant difference between the two hemipelvises (medianabsolute pairwise delta: 0.25mm; 10% percentile: 0.04, 90% percentile: 0.82; Wilcoxon, p = 0.064). CONCLUSION With regard to the periacetabular surface of the inner pelvis, the pelvis can be considered sufficiently symmetric for using the mirrored contralateral hemipelvis as a template for patient-specific implants in acetabular fracture fixation.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Department of Trauma Surgery
Dewey Decimal Classification:610 Medicine & health
Scopus Subject Areas:Health Sciences > Surgery
Health Sciences > Orthopedics and Sports Medicine
Language:English
Date:March 2019
Deposited On:04 Jan 2019 10:32
Last Modified:29 Jul 2020 08:34
Publisher:Lippincott Williams & Wilkins
ISSN:0890-5339
OA Status:Green
Publisher DOI:https://doi.org/10.1097/BOT.0000000000001373
PubMed ID:30562250

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