title: Computational reverse shoulder prosthesis model: Experimental data and verification.
abstract: The reverse shoulder prosthesis aims to restore the stability and function of pathological shoulders, but the biomechanical aspects of the geometrical changes induced by the implant are yet to be fully understood. Considering a large-scale musculoskeletal model of the upper limb, the aim of this study is to evaluate how the Delta reverse shoulder prosthesis influences the biomechanical behavior of the shoulder joint. In this study, the kinematic data of an unloaded abduction in the frontal plane and an unloaded forward flexion in the sagittal plane were experimentally acquired through video-imaging for a control group, composed of 10 healthy shoulders, and a reverse shoulder group, composed of 3 reverse shoulders. Synchronously, the EMG data of 7 superficial muscles were also collected. The muscle force sharing problem was solved through the minimization of the metabolic energy consumption. The evaluation of the shoulder kinematics shows an increase in the lateral rotation of the scapula in the reverse shoulder group, and an increase in the contribution of the scapulothoracic joint to the shoulder joint. Regarding the muscle force sharing problem, the musculoskeletal model estimates an increased activity of the deltoid, teres minor, clavicular fibers of the pectoralis major, and coracobrachialis muscles in the reverse shoulder group. The comparison between the muscle forces predicted and the EMG data acquired revealed a good correlation, which provides further confidence in the model. Overall, the shoulder joint reaction force was lower in the reverse shoulder group than in the control group.
authors.affiliation: IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. Electronic address: anam@dem.ist.utl.pt.
authors.forename: A
authors.initials: A
authors.lastname: Martins
authors.affiliation: IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. Electronic address: cquental@dem.ist.utl.pt.
authors.forename: C
authors.initials: C
authors.lastname: Quental
authors.affiliation: IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. Electronic address: jfolgado@dem.ist.utl.pt.
authors.forename: J
authors.initials: J
authors.lastname: Folgado
authors.affiliation: IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. Electronic address: jorge@dem.ist.utl.pt.
authors.forename: J
authors.initials: J
authors.lastname: Ambrósio
authors.affiliation: Faculty of Medicine, Universidade de Lisboa, Lisboa, Portugal. Electronic address: jac.monteiro@chln.min-saude.pt.
authors.forename: J
authors.initials: J
authors.lastname: Monteiro
authors.affiliation: Faculty of Medicine, Universidade de Lisboa, Lisboa, Portugal. Electronic address: marco.sarmento@chln.min-saude.pt.
authors.forename: M
authors.initials: M
authors.lastname: Sarmento
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D002968:Clavicle / Q000502:physiology; D003198:Computer Simulation; D057645:Deltoid Muscle / Q000502:physiology; D005260:Female; D006801:Humans; D007595:Joint Prosthesis; D008297:Male; D008954:Models, Biological; D009119:Muscle Contraction; D053580:Muscle Strength; D010369:Pectoralis Muscles / Q000502:physiology; D016059:Range of Motion, Articular / Q000502:physiology; D017006:Rotator Cuff / Q000502:physiology; D012540:Scapula / Q000502:physiology; D012782:Shoulder / Q000502:physiology; D012785:Shoulder Joint / Q000502:physiology*; D055815:Young Adult
keywords: Inverse dynamics; Multibody system dynamics; Musculoskeletal model; Reverse shoulder prosthesis; Shoulder joint