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    Wyświetlanie 1-4 z 4
    Tytuł:
    Assessment of standing balance in patients after ankle fractures
    Autorzy:
    Dudek, K.
    Drużbicki, M.
    Przysada, G.
    Śpiewak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/306346.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    staw skokowy
    równowaga
    biomechanika
    ankle fractures
    operative treatment
    balance
    Opis:
    Purpose: The objective of the study is to evaluate the degree of balance disorders in patients with surgical treatment of ankle fractures with the use of stabilometric examinations.Methods: The subjects in the study were 21 patients with ankle fractures treated surgically, within one year of the procedure. The control group were 20 healthy subjects. The balance was evaluated with the use of force platform in standing posture in both single and double limb stance. The analysed parameters were the transition area of the centre of feet pressure (COP), the length of the COP path and the COP velocity. The range of movement in the ankle joint and the intensification of pain were also measured.Results: In the balance evaluation in double limb stance, there were no statistically significant differences. A significant difference was found in the attempts of single limb-stance An average value of COP transition area in the study group was 261.2 mm2 in single stance (on the right operated limb) and in the control group – 93.2 mm2, so the difference was statistically significant (p=0,0096). The presence of pain, the presence or the removal of anastomosis had no significant influence on the balance of the studied subjects. Also a significant correlation between the balance of the subjects and their age was found.Conclusions: The balance in single limb stance after an instable ankle fracture within one year of the surgical procedure is significantly poorer in comparison with healthy subjects. Elderly persons have significantly poorer balance control.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 4; 59-65
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the biomechanical behaviour of articular cartilage in hindfoot joints
    Autorzy:
    Venturanto, C.
    Pavan, P. G.
    Forestiero, A.
    Carniel, E. L.
    Natali, A. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/307388.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ankle joint
    articular cartilage
    constitutive model
    numerical analysis
    staw skokowy
    chrząstka stawowa
    analiza numeryczna
    Opis:
    Numerical models represent a powerful tool for investigating the biomechanical behavior of articular cartilages, in particular in the case of complex conformation of anatomical site. In the literature, there are complex non-linear-multiphase models for investigating the mechanical response of articular cartilages, but seldom implemented for the analysis of high organized structure such as the foot. In the present work, the biomechanical behavior of foot cartilage is investigated by means of a fiber-reinforced hyperelastic constitutive model. The constitutive parameters are obtained through the comparison between in vitro experimental indentation tests on cartilage and numerical analysis data interpreting the specific experimental conditions. A finite element model of the hindfoot region is developed. Particular attention is paid to model cartilage in order to respect its morphometric configuration, including also the synovial capsule. The reliability of the procedure adopted is evaluated by comparing the numerical response of tibio-talar joint model with in vivo experimental tests mimicking the foot response in stance configuration.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 2; 57-65
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The upper ankle joint: Curvature morphology of the articulating surfaces and physiological function
    Autorzy:
    Nägerl, H.
    Kubein-Meesenburg, D.
    Fanghänel, J.
    Dathe, H.
    Dumont, C.
    Wachowski, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/306564.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biomechanika
    kinematyka
    człowiek
    górny staw skokowy
    biomechanics
    joint kinematics
    human
    curvature morphology
    upper ankle joint
    incongruity
    Opis:
    Purpose: The curvature morphology of the articulating surfaces determines the physiological movement pattern. We quantitatively examined the curvature morphology of the tibiotalar articulating surfaces and specified their geometric contact patterns. Methods: Geometrically equivalent cartographic nets were marked on the talar and tibial articulating surfaces of true-to-scale moldings of 20 human ankle joints (intervals of 5 mm) to relate corresponding articulating units of the surfaces. The corresponding contours of the net lines were compared, and the incongruity of articulating surfaces could thus be quantified locally. Results: All tibial sagittal net lines represented circular arcs. Along the sagittal talar net lines, the curvature radii increased medially from anterior to posterior but decreased laterally. Each net line could be approximated by three circular arcs. Examining these three parts of the talar net lines, the anterior sagittal curvature radii increased from medial to lateral, whereas the posterior radii decreased. The tibial and talar transversal net lines were congruent. The articulation surfaces showed a transversal contact line in every dorsal/plantar joint position. The degree of local congruity was solely ascertained by the incongruity of the corresponding sagittal net lines. The maximal degrees of congruity were found laterally for dorsal flexion, laterally/centrally for neutral joint position, and centrally/medially for plantar flexion. Conclusions: By the transversal line contact, the contact area is broadened over the articulating surfaces from lateral to medial. In dorsal flexion, compressive loads are mainly transferred by lateral/anterior zones and in plantar flexion by medial/posterior zones of the articulating surfaces. Reconstruction of the transversal contact line is essential.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 3; 83-90
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neuromechanical control in submaximal drop jumps: The effects of volitional effort demands and drop height magnitude on soleus muscle activation
    Autorzy:
    Mrdakovic, V.
    Pazin, N.
    Vulovic, R.
    Filipovic, N.
    Ilic, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/307166.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    elektromiografia
    sprzężenie zwrotne
    staw skokowy
    biomechanika
    electromyography
    stretch-shortening cycle
    feedback control
    pre activation
    feedforward control
    ankle biomechanics
    Opis:
    The purpose of this study was to investigate soleus muscle activation during different phases of drop jump performed at submaximal levels of volitional effort and drop height magnitude. Methods: Fifteen professional volleyball players with minimum of eight years of experience in jumping activities participated in the study. Experimental protocol involved executing submaximal drop jumps at three levels of volitional effort (i.e., 65, 80 and 95% of the maximal height of jump). All submaximal drop jumps were done from three drop heights (20, 40 and 60 cm). The soleus muscle activation was monitored during four jump phases: pre-activation phase before touchdown, early contact phase upon touchdown, early and late push-off phase. Results: The results indicate that volitional effort level did not change the muscle activation during pre activation and early contact phase, but only in early and late push-off phase ( p ≤ 0.05). Conversely, it was observed that muscle activation during all phases of drop jump was adapted to the increased intensity of the external load caused by increasing of drop height magnitude ( p ≤ 0.01). Conclusions: The findings of the present study suggested that soleus muscle activation has selective responses to internal load (i.e., volitional effort level) and external load (i.e., drop height magnitude) intensities when drop jump is executing with submaximal effort.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 4; 101-111
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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