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Wyszukujesz frazę "Knee" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Comparison of results of ACL reconstruction using LARS method and autogenous ST/GR graft
    Autorzy:
    Płocki, Jędrzej
    Pelikan, Piotr
    Bejer, Agnieszka
    Granek, Arkadiusz
    Krawczyk-Suszek, Marlena
    Kotela, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/306843.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    kolano
    wiązadło
    LARS
    artroskopia
    knee
    ACL reconstruction
    knee function
    arthroscopy
    Opis:
    The objective of the study was assessment of the function of the knee joint after ACL reconstruction using the LARS method and autogenous graft. The study was of a retrospective character and included 96 patients who had undergone reconstruction of the torn ACL. The study was conducted within 36–48 months after surgery. Methods: In order to compare the results of the ACL reconstruction performed with 2 types of grafts, the following instruments were used: Lysholm Knee Scoring Scale, SF 36v2 questionnaire for assessment of health-related quality of life, and Biodex System 4 for isokinetic muscle testing. Results: No differences in the evaluation of the quality of life measured using SF 36v2 questionnaire were observed between the LARS and ST GR groups. Using the Lysholm Scale, the distribution of knee function scores was compared according to the type of surgery. There are no grounds to confirm the differences in the distribution of knee function scores considering the type of graft ( p = 0.756). Isokinetic test showed a significant weakening of muscle strength in the operated limb, compared to the strength of the healthy limb. Conclusions: The type of graft used for ACL reconstruction does not exert an effect on the quality of life of patients or the level of their knee joint function. Extensor and flexor muscles strength of the knee joint was lower in the operated limb, irrespective of the type of graft used. Weak relationships were observed between the level of knee joint function and extensor muscle strength of this joint.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 1; 113-119
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The morphology of the articular surfaces of biological knee joints provides essential guidance for the construction of functional knee endoprostheses
    Autorzy:
    Nagerl, H.
    Dathe, H.
    Fiedler, Ch.
    Gowers, L.
    Kirsch, S.
    Kubein-Meesenburg, D.
    Dumont, C.
    Wachowski, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/307060.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    kolano
    kinematyka
    biomechanika
    endoproteza
    knee arthroplasty
    kinematics
    biomechanics
    knee
    endoprosthesis
    pig
    Opis:
    Purpose: In comparative examinations of kinematics of the knees of humans and pigs in flexional/extensional motion under compressive loads, the significant differential geometric essentials of articular guidance are elaborated to criticise the shaping of the articular surfaces of conventional knee-endoprostheses and to suggest constructional outlines that allow the endoprosthesis to adopt natural knee kinematics. Implantation is discussed with regard to the remaining ligamentous apparatus. Methods: Twelve fresh pig knee joints and 19 preserved human knee joints were moved into several flexional/extensional positions. In each joint, the tibia and femur were repeatably caught by metal plates. After removing all ligaments, the tibia and femur were again caught in these positions, and their points of contact were marked on both articular surfaces. Along the marker points, a thin lead wire was glued onto each surface. The positions and shapes of the four contact lines were mapped by teleradiography. Results: All contact lines were found to be plane curves. The medial and lateral planes were parallel, thus defining the joint’s sagittal plane. In the human knee, as compared to the lateral, the medial femoral contact line was always shifted anteriorly by several millimetres. The tibial contact curve was laterally convex and medially concave. In the pig knees, the lateral and medial contact lines were asymmetrically placed. Both tibial curves were convex. Conclusions: Both knees represent cam mechanisms (with one degree of freedom) that produce rolling of the articular surfaces during the stance phase. Implantation requires preservation of the anterior cruciate ligament, and ligamentous balancing is disadvantageous.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 2; 45-53
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of postural stability in patients after reconstruction of the anterior cruciate ligament with LARS and autogenous graft
    Autorzy:
    Plocki, J.
    Kotela, I.
    Bejer, A.
    Pelikan, P.
    Granek, A.
    Krawczyk-Suszek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/307030.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    postural stability
    knee
    ACL reconstruction
    LARS
    knee function
    stabilność postawy
    kolano
    ACL
    Opis:
    The aim of the study was to assess static balance after reconstruction of the anterior cruciate ligament (ACL), using gracialis tendons graft (GR) or semi-tendinosus (ST), compared to patients treated with the Ligament Advanced Reinforcement System (LARS). The study was performed within 36 to 48 months after the surgery. Methods: The study included 96 patients. The LARS group consisted of 44 patients, control group operated with ST/GR tendons included 52 patients. The stabilometric platform Alpha was used to assess the static balance. Two 30-second trials in the double-leg stance position with eyes opened and closed were performed. The distribution of loads in a free standing was also assessed. Results: In the test with open eyes the subjects from the LARS group had a significantly longer center of pressure (COP) path, a higher mean velocity, a greater mean COP sway in foot in the lateral direction and a larger path area occupied by the COP graph. During the tests with eyes closed, a significant difference occurred in the mean displacement of COP in lateral direction – greater in the LARS group. In addition, all parameters deteriorated during the tests with eyes closed in both groups. Conclusions: In static balance assessed with eyes closed, more proprioceptive deficits may appear in the LARS group.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 4; 9-14
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Układ wylotowy typu kolana sprężarki promieniowej i osiowo-promieniowej
    Autorzy:
    Antas, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/2032833.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    sprężarka promieniowa
    sprężarka osiowo-promieniowa
    kanał wylotowy
    kolano
    radial compressor
    axial-radial compressor
    exhaust duct
    knee
    Opis:
    Kolano jest układem wylotowym kanału przepływowego sprężarki promieniowej i osiowo-odśrodkowej, w którym następuje zmiana kierunku przepływu z promieniowego na kierunek wyznaczony przez oś dyfuzora komory spalania. W pracy przedstawiono metodę wyznaczania parametrów strumienia w przekroju wyjściowym układu wylotowego sprężarki promieniowej i osiowo-odśrodkowej. Analiza obejmuje układ wylotowy typu kolana. Zaprezentowano także odpowiednią metodę określania parametrów geometrycznych dla kanału wylotowego tego typu. Wymienione metody mogą być stosowane w trakcie realizacji projektu koncepcyjnego sprężarki, a oparto je na równaniu zachowania energii, równaniu ciągłości przepływu, pierwszej i drugiej zasadzie termodynamiki oraz funkcjach gazodynamicznych i definicjach używanych w teorii maszyn wirnikowych. Końcowa część pracy zawiera zasady doboru obliczeniowej wartości sprężu sprężarki z promieniowym dyfuzorem łopatkowym oraz wnioski.
    Źródło:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2020, z. 92 [300], 1; 29-43
    0209-2689
    2300-5211
    Pojawia się w:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physiological parameters analysis of transfemoral amputees with different prosthetic knees
    Autorzy:
    Li, Sujiao
    Cao, Wujing
    Yu, Hongliu
    Meng, Qiaoling
    Chen, Wenming
    Powiązania:
    https://bibliotekanauki.pl/articles/306380.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    protetyka
    kolano
    mikroprocesor
    chód
    energia
    transfemoral amputee
    microprocessor-controlled prosthetic knee
    energy cost
    gait efficiency
    relative exercise intensity
    Opis:
    Physiological parameters analysis allows for a precise quantification of energy expenditure of transfemoral amputees with different prosthetic knees. Comparative physiological parameters analysis that indicate the functional characteristics of knee joints is essential to the choice of transfemoral amputee. The aim of this study was to propose a microprocessor-controlled prosthetic knee (i-KNEE) and conducted physiological parameters (energy cost, gait efficiency and relative exercise intensity) comparison of transfemoral amputees with C-leg, Rheo Knee and Mauch under different walking speeds. Methodsː A microprocessor-controlled prosthetic knee with hydraulic damper (i-KNEE) was developed. A two-factor repeated measurement experiment design was used. Each subject was instructed to accept the same treatments. The two factors were type of prosthetic knees (the i-KNEE, the C-Leg, the Rheo Knee and the Mauch) and speed (0.5, 0.7, 0.9, 1.1, 1.3 m/s). The energy cost, gait efficiency and relative exercise intensity of ten transfemoral amputees were measured. Resultsː For all the prosthetic knees, the energy cost increased along with walking speed. There was no significant difference between three microprocessor-controlled prosthetic knees in energy cost. The gait efficiency of Mauch was always less than or equal to other three microprocessor-controlled prosthetic knees in specific walking speed. The relative exercise intensity increased with speed for all the prosthetic knees. More effort was needed for the transfemoral amputees with Mauch than other three microprocessorcontrolled prosthetic knees in the same walking speed. Conclusionsː The use of the microprocessor-controlled knee joints resulted in reduced energy cost, improved gait efficiency and smaller relative exercise intensity.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 3; 135-142
    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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