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research-article

Modeling the Variability of Glenoid Geometry in Intact and Osteoarthritic Shoulders

[+] Author and Article Information
Charlotte de Vries

Department of Mechanical Engineering, The Pennsylvania State University Erie, Erie, PA 16510
devries@psu.edu

Matthew B Parkinson

Engineering Design Program, Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802
parkinson@psu.edu

1Corresponding author.

ASME doi:10.1115/1.4037408 History: Received January 27, 2017; Revised July 19, 2017

Abstract

The objective of this research is to model the geometric variability of the glenoid of the scapula. The glenoid is the "socket" component of the "ball and socket" connection of the shoulder joint. The model must capture the ob- served variability with sufficient resolution such that it in- forms both operative and design decisions. This requires the quantification of variability in landmark locations and relevant bone geometry. Landmarks were placed on the existing glenoid meshes such that they provided enough information to represent the geometry while being consistent across each glenoid. Additionally, the surface geometry of the glenoid vault was modeled. This required the application of existing mathematical and statistical modeling approaches, including geometric fitting, radial basis functions, and principal component analysis. The landmark identification process represented the glenoid in a new manner. The work was validated against existing approaches and CT scans from 42 patients. Information on the range of shoulder geometries can assist with preoperative planning as well as implant design for Total Shoulder Arthroplasty (TSA). Principal component analysis (PCA) was used to quantify the variability of shape across the glenoid landmarks and synthesize new glenoid models. The process of creation of these shoulder geometries may be useful for the study of other joints. The mod- els created will help surgeons and engineers to understand the effects of osteoarthritis on bone geometry, as well as the range of variability present in healthy shoulders.

Copyright (c) 2017 by ASME
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