Autor: Křen, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of plant residue management on microbial properties and water-stable aggregates of two agricultural soils
Autorzy:: Balashov, E.
Kren, J.
Prochazkova, B.
Powiązania:: https://bibliotekanauki.pl/articles/25304.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:: International Agrophysics; 2010, 24, 1; 9-13
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Biomechanical comparison of a transiliac internal fixator and two iliosacral screws in transforaminal sacral fractures: a finite element analysis
Autorzy:: Salasek, M.
Jansova, M.
Křen, J.
Pavelka, T.
Weisova, D.
Powiązania:: https://bibliotekanauki.pl/articles/306399.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: analiza MES
stabilizator
biomechanika
finite element analysis
transiliac internal fixator
iliosacral screw
pelvic ring
transforaminal fracture
Opis:: Purpose: Vertically unstable sacral transforaminal fractures can be stabilized with a transiliac internal fixator (TIFI) or two iliosacral screws (IS). This study was designed to compare stiffness between TIFI and IS. Methods: Using CT images finite element model of the pelvis was developed. Denis II type fracture was simulated and fixed either with TIFI or two IS. The sacral base was loaded vertically (250–500 N), displacement magnitudes on medial and lateral fracture surface and the maximum bone stress were calculated. The intact pelvis was used as a reference. Stiffness was determined by linear regression of load and displacement, computed stiffness ratio %. The von Mises stress was expressed as % ratio, evaluation of colour mapping was made. Results: The mean stiffness ratio medially in TIFI was 75.22%, in IS 46.54% ( p = 0.00005), laterally in TIFI 57.88%, in IS 44.74% ( p = 0.03996). The von Mises stress ratio of TIFI was 139.27%, of IS 565.35% ( p < 0.00001). Conclusions: Significantly higher stiffness and lower stress were found in TIFI model. TIFI provides a lower risk of over-compression of the fracture line in comparison with IS. TIFI thus exhibits superiority for fixation of transforaminal fractures, particularly with comminutive zone.
Źródło:: Acta of Bioengineering and Biomechanics; 2015, 17, 1; 39-49
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

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