Symmetry Matching of the Medial Acetabular Surface-A Quantitative Analysis in View of Patient-Specific Implants.
- Osterhoff G Department of Trauma, University Hospital Zurich, Zürich, Switzerland.
- Petersik A Research & Development, Trauma & Extremities division, Stryker Trauma GmbH, Schoenkirchen, Germany.
- Sprengel K Department of Trauma, University Hospital Zurich, Zürich, Switzerland.
- Pape HC Department of Trauma, University Hospital Zurich, Zürich, Switzerland.
- 2018-12-19
Published in:
- Journal of orthopaedic trauma. - 2019
Acetabulum
Bone Plates
Cross-Sectional Studies
Fractures, Bone
Humans
Models, Anatomic
Patient-Specific Modeling
Pelvic Bones
Surgery, Computer-Assisted
English
OBJECTIVE
To quantify intrapelvic surface symmetry in reference to a preshaped suprapectineal acetabular implant.
METHODS
In this cross-sectional study, an anatomically preshaped acetabular fracture implant was fitted on 3D surface models of 516 pelvises from a preexisting 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 2 hemipelvises (median absolute pairwise delta: 0.25 mm; 10% percentile: 0.04, 90% percentile: 0.82; Wilcoxon, P = 0.064).
CONCLUSIONS
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.
To quantify intrapelvic surface symmetry in reference to a preshaped suprapectineal acetabular implant.
METHODS
In this cross-sectional study, an anatomically preshaped acetabular fracture implant was fitted on 3D surface models of 516 pelvises from a preexisting 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 2 hemipelvises (median absolute pairwise delta: 0.25 mm; 10% percentile: 0.04, 90% percentile: 0.82; Wilcoxon, P = 0.064).
CONCLUSIONS
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.
- Language
-
- English
- Open access status
- green
- Identifiers
-
- DOI 10.1097/BOT.0000000000001373
- PMID 30562250
- Persistent URL
- https://sonar.ch/global/documents/298723
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