Development of a shoulder musculoskeletal model to assess the impact of scapular morphology on glenohumeral biomechanics

Abstract

Many theories, which aim to explain pathomechanisms of glenohumeral joint disorders, focus on unfavorable scapula morphology. In silico methods, such as musculoskeletal modeling, give an opportunity to better understand underling pathomechanism. In silico methods do not require invasive procedures and expensive cadaveric specimens. However, before applying the model to a research problem, the researcher must ensure that the model is able to give the correct answer. The purpose of this doctoral thesis was hence in the first phase to find and evaluate an approach for the deltoid muscle wrapping, which represents physiological behavior in full-range of GHJ motion. The purpose of the second phase is to assess the variability of the morphological measurement called the critical shoulder angle (CSA) on the biomechanics of the glenohumeral joint after NC-TSA and potential glenoid component loosening. In the first phase, the advancement in the development of the large-scale musculoskeletal model of NC total shoulder arthroplasty was demonstrated Improvement was made in the geometrical representation of the deltoid muscle. Two distanced approaches had been proposed and evaluated, namely 2D-mesh model and multi-ellipsoid wrapping model. The changes allows to study the impact of the scapula morphology on the glenohumeral joint biomechanics The second phase demonstrates the feasibility of the above model to be used in clinical application. The presented study aimed to evaluate the impact of the morphological variability of the scapula, and more specifically the morphological parameter called the critical shoulder angle, as a potential risk factor in glenoid component loosening.

Date	30 Jul 2021
Original language	American English
Awarding Institution	École de technologie supérieure
Supervisor	Nicola Hagemeister (Supervisor), Mickael Begon (Co-supervisor) & Lauranne Sins (Co-supervisor)