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    Wyświetlanie 1-5 z 5
    Tytuł:
    Experimental study of the loss of balance process before falling from a height
    Autorzy:
    Milanowicz, M.
    Budziszewski, P.
    Kędzior, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/307442.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    równowaga człowieka
    analiza 3D
    wirtualna rzeczywistość
    loss of balance
    falls from height
    3D motion analysis
    virtual reality
    Opis:
    Due to a high number of accidents at work, actions have been undertaken to apply numerical simulation for reconstruction of their course in time. First works on this issue showed that the numerical human body model developed in the Central Institute for Labour Protection – National Research Institute (CIOP-PIB) should be adjusted to the nature of specific accidents. Hence, a need arose to adjust the model for reconstruction and simulation of falls from heights. The adjustment involved supplementing the model with functions enabling taking into account movements of a person at the time of losing their balance, as such movements influence the course of a fall. For this purpose, a study with participation of volunteers has been conducted to define these movements. Within the framework of the study, reactions (body movements) of the subjects at the time of losing their balance were recorded. The works resulted in obtaining parameters that, after an analysis, may be used as initial conditions for a numerical model of the human body.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 1; 55-64
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The evaluation of the accuracy of shape imaging of prosthetic abutment
    Autorzy:
    Ryniewicz, W. I.
    Ryniewicz, A. M.
    Wiśniewska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/306759.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    filar protetyczny
    technika replik
    model numeryczny
    analiza 3D
    prosthetic abutment
    replica technique
    numerical models
    3D analysis
    shape errors
    Opis:
    Purpose: The aim of the study was the in vitro evaluation of the accuracy of shape imaging of abutment teeth using different impression compounds. Methods: To compare the accuracy of the shape of the numerically imaged real prosthetic abutments with the tested models of abutments obtained with the replica technique, the Geomagic Qualify program was applied. Making use of the licensed program Statistica, statistical analysis of the results obtained was conducted. Results: In the research procedures, analyses were conducted for 10 abutment premolars and 10 abutment molars. The tests allowed us to state that the dimensional accuracy of the models of prosthetic abutments obtained with the application of elastic compounds tested ensures comparable shape imaging. Conclusions: The objective method developed and applied here is suitable for controlling the imaging of the abutment teeth. The Geomagic Qualify program that was used during the research is a reliable tool of 3D analysis for the estimation of procedure of abutment tooth preparation and indication of an error of shape of prepared occlusal surface, lateral surface of abutment and errors of shaping the chamfer zone.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 2; 43-50
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three-dimensional analysis of gait in children and adolescents with juvenile idiopathic arthritis
    Autorzy:
    Bazarnik-Mucha, Katarzyna
    Snela, Sławomir
    Szczepanik, Magdalena
    Jarmuziewicz, Agnieszka
    Guzik, Agnieszka
    Wolińska, Olga
    Drużbicki, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/27324146.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    rehabilitation
    arthritis
    juvenile
    3D gait analysis
    rehabilitacja
    artretyzm
    nieletni
    analiza chodu 3D
    Opis:
    The paper aimed to assess the gait pattern in children and adolescents with juvenile idiopathic arthritis (JIA) treated at the rehabilitation center and to assess changes in this pattern after the end of treatment and 9 months later. Methods: 50 children with JIA were enrolled into the study. 35 healthy volunteers were enrolled into the study for a comparison. Spatiotemporal and kinematic gait parameters were obtained using a movement analysis system. The Gait Deviation Index (GDI) was calculated. The assessment was performed three times: on the day of admission to the rehabilitation center, after the end of a 4-week treatment period and 9 months later. Results: With regard to the majority of spatiotemporal and kinematic parameters, differences in their distribution were highly statistically significant between the study group and the control group ( p < 0.001). In two subsequent tests, differences were less significant when compared to the control group ( p < 0.01). In the study group, ranges of motion in the sagittal plane in the hip ( p < 0.01), knee ( p < 0.001) and ankle joints ( p < 0.01) increased significantly between tests 1 and 2, and 1 and 3. A significantly lower value of GDI was observed in the study group (right limb; p = 0.036). Conclusions: The gait pattern of children with JIA is significantly different from the one observed in healthy children. A rehabilitation program significantly improved gait in children with JIA, but differences compared to healthy children were still observed, and it indicates that the abnormal gait pattern became permanent in this group of subjects.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 2; 35--45
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and stress analyses of a normal foot-ankle and a prosthetic foot-ankle complex
    Autorzy:
    Ozen, M.
    Sayman, O.
    Havitcioglu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/306591.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    3D modeling
    finite element analysis
    prosthetic foot-ankle complex
    modelowanie 3D
    proteza
    analiza elementów skończonych
    Opis:
    Total ankle replacement (TAR) is a relatively new concept and is becoming more popular for treatment of ankle arthritis and fractures. Because of the high costs and difficulties of experimental studies, the developments of TAR prostheses are progressing very slowly. For this reason, the medical imaging techniques such as CT, and MR have become more and more useful. The finite element method (FEM) is a widely used technique to estimate the mechanical behaviors of materials and structures in engineering applications. FEM has also been increasingly applied to biomechanical analyses of human bones, tissues and organs, thanks to the development of both the computing capabilities and the medical imaging techniques. 3-D finite element models of the human foot and ankle from reconstruction of MR and CT images have been investigated by some authors. In this study, data of geometries (used in modeling) of a normal and a prosthetic foot and ankle were obtained from a 3D reconstruction of CT images. The segmentation software, MIMICS was used to generate the 3D images of the bony structures, soft tissues and components of prosthesis of normal and prosthetic ankle-foot complex. Except the spaces between the adjacent surface of the phalanges fused, metatarsals, cuneiforms, cuboid, navicular, talus and calcaneus bones, soft tissues and components of prosthesis were independently developed to form foot and ankle complex. SOLIDWORKS program was used to form the boundary surfaces of all model components and then the solid models were obtained from these boundary surfaces. Finite element analyses software, ABAQUS was used to perform the numerical stress analyses of these models for balanced standing position. Plantar pressure and von Mises stress distributions of the normal and prosthetic ankles were compared with each other. There was a peak pressure increase at the 4th metatarsal, first metatarsal and talus bones and a decrease at the intermediate cuneiform and calcaneus bones, in prosthetic ankle-foot complex compared to normal one. The predicted plantar pressures and von Misses stress distributions for a normal foot were consistent with other FE models given in the literature. The present study is aimed to open new approaches for the development of ankle prosthesis.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 3; 19-27
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D kinematic analysis of patients’ gait before and after unilateral total hip replacement
    Autorzy:
    Kolářová, Kateřina
    Vodička, Tomáš
    Bozděch, Michal
    Repko, Martin
    Powiązania:
    https://bibliotekanauki.pl/articles/27324147.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hip joint
    arthrosis
    THR
    3D kinematics
    gait analysis
    staw biodrowy
    artroza
    kinematyka 3D
    analiza chodu
    Opis:
    Purpose: The purpose of the study was to describe changes in the kinematic parameters in the patients’ gait after total hip replacement. Methods: Research group of men in the end stage of osteoarthritis indicated to the THR (n = 10; age 54.1 ± 7.5 years; weight 92.2 ± 9.6 kg; height 179.7 ± 5.9 cm). All participants underwent a total of three measurements: before surgery, 3 and 6 months after the surgery. Using the 3D kinematic analysis system, the patients’ gait was recorded during each measurement session and kinematic analysis was carried out. The parameters that were monitored included the sagittal range of motion while walking in the ankle, the knee and the hip joints of the operated and the unoperated limb, and the range in the hip joint’s frontal plane, the rotation of pelvis in the frontal and transverse planes, as well as the speed of walking and the walking step length. Results: Significant increases were found in sagittal range of motion in the operated hip joint, sagittal range of motion in the ankle joint on the unoperated side and in the walking step length of the unoperated limb. Conclusions: During walking after a THR, the sagittal range of motion in the ankle of the unoperated limb increases. Also, the range of motion in the sagittal plane on the operated joint increases, which is related to the lengthening of the step of the unoperated lower limb.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 2; 165--171
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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