A rigid body model for the assessment of glenohumeral joint mechanics: Influence of osseous defects on range of motion and dislocation

Abstract 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...

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Bibliographic Details
Published in:Journal of biomechanics 2016-02, Vol.49 (4), p.514-519
Main Authors: Welsh, Mark F, Willing, Ryan T, Giles, Joshua W, Athwal, George S, Johnson, James A
Format: Article
Language:English
Subjects:
Adult
Aged
Biomechanical Phenomena
Biomechanics
Computer simulation
Defects
Dislocation
Dislocations
Hill–Sachs
Humans
Humeral Head - physiology
Humeral Head - physiopathology
Instability
Joint Instability - pathology
Joint Instability - physiopathology
Joint surgery
Male
Mathematical models
Mechanical Phenomena
Middle Aged
Models, Anatomic
Multibody models
Patients
Physical Medicine and Rehabilitation
Range of Motion, Articular
Rigid-body dynamics
Rotation
Rotational
Scapula - physiology
Scapula - physiopathology
Shoulder
Shoulder Dislocation - pathology
Shoulder Dislocation - physiopathology
Shoulder Dislocation - surgery
Shoulder Joint - anatomy & histology
Shoulder Joint - physiology
Shoulder Joint - surgery
Shoulders
Studies
Translations
Young Adult
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Description
Summary:Abstract 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< p
ISSN:0021-9290
1873-2380
DOI:10.1016/j.jbiomech.2015.11.001