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dc.contributor.authorCosta, Joao
dc.contributor.authorPeixoto, Joaquim
dc.contributor.authorMoreira, Pedro
dc.contributor.authorSouto, Antoio Pedro
dc.contributor.authorFlores, Paulo
dc.contributor.authorLankarani, Hamid M.
dc.identifier.citationCosta J, Peixoto J, Moreira P, Pedro Souto A, Flores P, Lankarani HM. Influence of the Hip Joint Modeling Approaches on the Kinematics of Human Gait. ASME. J. Tribol. 2016;138(3):031201-031201-10en_US
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractThe influence of the hip joint formulation on the kinematic response of the model of human gait is investigated throughout this work. To accomplish this goal, the fundamental issues of the modeling process of a planar hip joint under the framework of multibody systems are revisited. In particular, the formulations for the ideal, dry, and lubricated revolute joints are described and utilized for the interaction of femur head inside acetabulum or the hip bone. In this process, the main kinematic and dynamic aspects of hip joints are analyzed. In a simple manner, the forces that are generated during human gait, for both dry and lubricated hip joint models, are computed in terms of the system's state variables and subsequently introduced into the dynamics equations of motion of the multibody system as external generalized forces. Moreover, a human multibody model is considered, which incorporates the different approaches for the hip articulation, namely, ideal joint, dry, and lubricated models. Finally, several computational simulations based on different approaches are performed, and the main results are presented and compared to identify differences among the methodologies and procedures adopted in this work. The input conditions to the models correspond to the experimental data capture from an adult male during normal gait. In general, the obtained results in terms of positions do not differ significantly when different hip joint models are considered. In sharp contrast, the velocity and acceleration plotted vary significantly. The effect of the hip joint modeling approach is clearly measurable and visible in terms of peaks and oscillations of the velocities and accelerations. In general, with the dry hip model, intrajoint force peaks can be observed, which can be associated with the multiple impacts between the femur head and the cup. In turn, when the lubricant is present, the system's response tends to be smoother due to the damping effects of the synovial fluid.en_US
dc.description.sponsorshipPortuguese Foundation for Science and Technology for the Ph.D. Grant Nos. SFRH/BD/76573/2011 and SFRH/BD/64477/2009, respectively. The authors would like to thank the Portuguese Foundation for Science and Technology through the Project No. UID/EEA/04436/2013. The authors also gratefully acknowledge the financial support from QREN (Quadro de Referencia Estrategico Nacional-National Strategic Reference Framework), for this study "INOVSHOES-Padronizar para Customizar Calcado Ortopedico," Project No. 2010/12032.en_US
dc.publisherAmerican Society of Mechanical Engineersen_US
dc.relation.ispartofseriesJournal of Tribology;v.138:no.3
dc.subjectHip articulationen_US
dc.subjectIdeal jointen_US
dc.subjectDry jointen_US
dc.subjectLubricated jointen_US
dc.subjectMultibody modelen_US
dc.titleInfluence of the hip joint modeling approaches on the kinematics of human gaiten_US
dc.rights.holderCopyright © 2016 by ASMEen_US

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