JOSE OTAVIO REGGI PECORA

(Fonte: Lattes)
Índice h a partir de 2011
4
Lattes
Projetos de Pesquisa
Unidades Organizacionais
LIM/41 - Laboratório de Investigação Médica do Sistema Músculoesquelético, Hospital das Clínicas, Faculdade de Medicina

Filtros

Limpar filtros

Configurações

Tipo de acesso: restrictedAccess ×

Resultados de Busca

Agora exibindo 1 - 2 de 2
  • article 0 Citação(ões) na Scopus
    A numerical study of the contact geometry and pressure distribution along the glenoid track
    (2022) TRICHEZ JUNIOR, Alexandre Neves; PECORA, Jose Otavio Reggi; FERREIRA NETO, Arnaldo Amado; ROESLER, Carlos Rodrigo de Mello; FANCELLO, Eduardo Alberto
    The glenoid track geometry and the contact forces acting on the glenohumeral joint at static positions of 30 degrees, 60 degrees, 90 degrees and 120 degrees of abduction with 90 degrees of external rotation were evaluated using a finite element model of the shoulder that, differently from most usual approximations, accounts the humeral head translations and the deformable-to-deformable non-spherical joint contact. The model was based on data acquired from clinical exams of a single subject, including the proximal humerus, scapula, their respective cartilages concerning the glenohumeral joint, and the rotator cuff and deltoid muscles. The forces acting on the glenohumeral joint were estimated using a simulation framework consisting of an optimization procedure allied with finite element analysis that seeks the minimum muscle forces that stabilize the joint. The joint reaction force magnitude increases up to 680.25 N at 90 degrees of abduction and decreases at further positions. From 60 degrees onward the articular contact remains at the anterior region of the glenoid cartilage and follows an inferior to superior path at the posterior region of the humeral head cartilage. The maximum contact pressure of 3.104 MPa occurs at 90 degrees abduction. Although translating inferiorly throughout the movement, the projection of the humeral head center at the glenoid plane remains at the central region of the glenoid surface. The model results qualitatively matched the trends observed in the literature and supports the consideration of the translational degrees of freedom to evaluate the joint contact mechanics.
  • article 8 Citação(ões) na Scopus
    Glenoid track evaluation by a validated finite-element shoulder numerical model
    (2020) PECORA, Jose Otavio Reggi; NEVES JUNIOR, Alexandre T.; ROESLER, Carlos Rodrigo M.; FANCELLO, Eduardo Alberto; MALAVOLTA, Eduardo A.; GRACITELLI, Mauro Emilio C.; ASSUNCAO, Jorge Henrique; NETO, Arnaldo Amado F.
    Background: The limits of the glenoid track have been defined through methods that do not take properly into account the physiological articular forces involved in the articular contact, which may interfere with its size. Finite elements numerical models can simulate joint forces more realistically. Objective: To evaluate the glenoid track in a finite element numerical model of the shoulder. Methods: We developed a finite element numerical model of the shoulder, based on imaging exams of a volunteer, including the proximal humerus, scapula, their respective articular cartilages, and the rotator cuff muscles. An algorithm to balance the weight of the arm calculated muscle, wrapping, and articular reaction forces. The model has freedom of translation in three axes. The articular contact characteristics and glenoid track's dimensions according to the literature references were evaluated in 60 degrees, 90 degrees and 120 degrees of abduction, all at the 90 degrees external rotation. Results: The model's anatomy and physiology were validated. The value of the glenoid track (according to Yamamoto's parameters) was 86% of glenoid length at 90 degrees abduction before loading of forces, and 79% afterwards. The glenoid track at 60 degrees, 90 degrees and 120 degrees of abduction (Omori's parameters) corresponded, respectively, to 71%, 88% and 104% of glenoid length before loading of forces, and 76%, 84% and 103% afterward. Conclusion: The numerical model is suitable for the shoulder articular contact evaluation. The articular contact analysis ratifies the glenoid track concept and contributes to its evolution. This value is influenced by glenohumeral joint forces, which should be considered for the analysis.