Bone and Joint Institute
Title
A rigid body model for the assessment of glenohumeral joint mechanics: Influence of osseous defects on range of motion and dislocation
Document Type
Article
Publication Date
2-29-2016
Journal
Journal of Biomechanics
Volume
49
Issue
4
First Page
514
Last Page
519
URL with Digital Object Identifier
10.1016/j.jbiomech.2015.11.001
Abstract
© 2016. The purpose of this study was to employ subject-specific computer models to evaluate the interaction of glenohumeral range-of-motion and Hill-Sachs humeral head bone defect size on engagement and shoulder dislocation. We hypothesized that the rate of engagement would increase as defect size increased, and that greater shoulder ROM would engage smaller defects. Three dimensional computer models of 12 shoulders were created. For each shoulder, additional models were created with simulated Hill-Sachs defects of varying severities (XS=15%, S=22.5%, M=30%, L=37.5%, XL=45% and XXL=52.5% of the humeral head diameter, respectively). Rotational motion simulations without translation were conducted. The simulations ended if the defect engaged the anterior glenoid rim with resultant dislocation. The results showed that the rate of engagement was significantly different between defect sizes (0.001