A statistical shape model to predict the premorbid glenoid cavity.

Abler, Daniel; Berger, Steve; Terrier, Alexandre; Becce, Fabio; Farron, Alain; Büchler, Philippe (2018). A statistical shape model to predict the premorbid glenoid cavity. Journal of shoulder and elbow surgery, 27(10), pp. 1800-1808. Elsevier 10.1016/j.jse.2018.04.023

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BACKGROUND This study proposes a method for inferring the premorbid glenoid shape and orientation of scapulae affected by glenohumeral osteoarthritis (OA) to inform restorative surgery. METHODS A statistical shape model (SSM) built from 64 healthy scapulae was used to reconstruct the premorbid glenoid shape based on anatomic features that are considered unaffected by OA. First, the method was validated on healthy scapulae by quantifying the accuracy of the predicted shape in terms of surface distance, glenoid version, and inclination. The SSM-based reconstruction was then applied to 30 OA scapulae. Glenoid version and inclination were measured fully automatically and compared between the original OA glenoids, SSM-based glenoid reconstructions, and healthy scapulae. RESULTS Validation on healthy scapulae showed a root-mean-square surface distance between original and predicted glenoids of 1.0 ± 0.2 mm. The prediction error was 2.3° ± 1.8° for glenoid version and 2.1° ± 2.0° for inclination. When applied to an OA dataset, SSM-based reconstruction restored average glenoid version and inclination to values similar to the healthy situation. No differences were observed between average orientation values measured on SSM-based reconstructed and healthy scapulae (P ≥ .10). However, the average orientation of the reconstructed premorbid glenoid differed from the average orientation of OA glenoids for Walch classes A1 (version) and B2 (version, inclination, and medialization). CONCLUSION The proposed SSM can predict the premorbid glenoid cavity of healthy scapulae with millimeter accuracy. This technique has the potential to reconstruct the premorbid glenoid cavity shape, as it was prior to OA, and thus to guide the positioning of glenoid implants in total shoulder arthroplasty.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Abler, Daniel; Berger, Steve and Büchler, Philippe

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health
600 Technology > 620 Engineering

ISSN:

1058-2746

Publisher:

Elsevier

Language:

English

Submitter:

Philippe Büchler

Date Deposited:

19 Jun 2019 11:09

Last Modified:

19 Jun 2019 11:14

Publisher DOI:

10.1016/j.jse.2018.04.023

PubMed ID:

29958822

Uncontrolled Keywords:

3D reconstruction Glenoid computed tomography inclination statistical shape model total shoulder arthroplasty version

BORIS DOI:

10.7892/boris.126716

URI:

https://boris.unibe.ch/id/eprint/126716

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