RESUMO
The China Mechanical Virtual Human (CMVH) is a human musculoskeletal biomechanical simulation platform based on China Visible Human slice images; it has great realistic application significance. In this paper is introduced the construction method of CMVH 3D models. Then a simulation system solution based on Creator/Vega is put forward for the complex and gigantic data characteristics of the 3D models. At last, combined with MFC technology, the CMVH simulation system is developed and a running simulation scene is given. This paper provides a new way for the virtual reality application of CMVH.
Assuntos
Humanos , Algoritmos , Anatomia Transversal , Fenômenos Biomecânicos , China , Gráficos por Computador , Simulação por Computador , Imageamento Tridimensional , Métodos , Modelos Biológicos , Músculo Esquelético , Fisiologia , Software , Interface Usuário-Computador , Projetos Ser Humano VisívelRESUMO
This paper presents a component mode synthesis approach to estimate tibial strains in gait. First, 3D models of the human musculoskeletal system were constructed based on the China Visible Human (CVH) dataset. Then an experiment was carried out to capture the subject gait motion. An inverse dynamic algorithm was developed to predict joint moments and an optimization algorithm was used to predict muscle forces in subject gait. Finally, a finite element model of the tibia was built. The muscle forces were input into the tibia finite element model as boundary conditions. Through the proposed component mode synthesis approach, 12 mode shapes and strains of tibia were estimated. The maximum and minimum principal strain magnitudes of tibia are 499 microstrain and -612 microstrain respectively. The maximum and minimum strain rates of tibia are 4130 microstrain s(-1) and -3970 microstrain s(-1) respectively. These figures are in line with literature values from in vivo measurements using an invasive strain gauge. In conclusion,the component mode synthesis approach may be used as a surrogate for experimental bone strain measurements and thus be of use in detailed strain estimation of bones indifferent applications.
Assuntos
Marcha/fisiologia , Esqueleto , Tíbia/anatomia & histologia , Tíbia/fisiologia , Adulto , Fenômenos Biomecânicos , Simulação por Computador , Humanos , Imageamento Tridimensional , Masculino , Software , Estresse MecânicoRESUMO
Operation navigation is one of the important compositions of minimally invasive surgery technology. Operation navigation is one of the important compositions of minimally invasive surgery technology. It is a hotspot studied at home and abroad. The navigation products have been studied and applied at abroad, but they are still exploring at home.The article introduces the concept, composition and application of the operation navigation system briefly. Directing against the difficulty of interlocking intramedullary nails location in femoral shaft fracture operation, the fact that the necessity of using operation navigation system is expounded. And the feasibility of using femoral shaft fracture operation navigation and the relevant researches are discussed. It is doable for the navigation system to be used in fixing interlocking intramedulary nail in our laboratory.
