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  • 1
    ISSN: 1433-0431
    Keywords: Schlüsselwörter Vergleichende Studie ; Chirulen ; Hylamer ; Enduron ; Key words Comparative study ; Chirulen ; Hylamer ; Enduron
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The creep and wear behaviour of Chirulen, Hylamer and Enduron, materials which differ only in their manufacturing procedures, was examined and compared. Chirulen is manufactured by being pressed into form by plates, whereas Hylamer and Enduron are shaped by tubes. Hylamer differs from Enduron in that intermediate material processing is undertaken with the goal of improving the initial material. The wear and deformation rate was determined by means of the ring-on-disc testing device after 360,000 cycles and after 1.0 × 106 cycles, respectively. The static tests for the determination of wear were carried out at a contact stress of 5.62 MPa and a testing time of 100 h in analogy to the ring-on-disc tests. Chirulen and Hylamer demonstrated comparable wear with a tendency toward a lower wear rate in Hylamer, while Enduron presented a clearly higher wear rate.
    Notes: Zusammenfassung Das Kriech- und Verschleißverhalten von Chirulen, Hylamer und Enduron wurde gegenübergestellt. Diese Materialien unterscheiden sich durch das Herstellungsverfahren. Chirulen wird durch Pressen in Form von Platten hergestellt, während Hylamer und Enduron aus extrudierten Stäben resultiert. Hylamer unterscheidet sich von Enduron durch eine spezielle Materialzwischenaufbereitung, wodurch eine Veredelung des Ausgangsmaterials erreicht werden soll. Im Ring-on-disc-Prüfverfahren wurden Verschleiß- und Deformationsvolumen pro 360 000 Zyklen und 1,0× 106 Zyklen ermittelt. Die statischen Prüfungen zur Ermittlung des Deformationsverhaltens wurden bei der Flächenpressung von 5,62 MPa und einer Prüfdauer von 100 h durchgeführt, analog der Ring-on-disc-Prüfung. Bei Chirulen und Hylamer zeigte sich ein vergleichbares Verschleißverhalten, wobei aber bei Hylamer ein tendentiell geringeres Verschleißvolumen ermittelt werden konnte. Enduron lieferte ein deutlich ungünstigeres Verschleißverhalten.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Knee surgery, sports traumatology, arthroscopy 1 (1993), S. 34-38 
    ISSN: 1433-7347
    Keywords: Sports ; Children ; Adolescents ; Knee injury ; Arthroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Sports Science
    Notes: Abstract Within a 3-year period (1985–1988), 60 children and adolescents with knee injuries sustained mainly while skiing or playing football (soccer) underwent clinical examination, X-radiography and arthroscopy. Nearly all the patients still had open epiphyseal plates in the knee region. Arthroscopy revealed more severe intra-articular trauma than had been suspected on the basis of clinical findings. The skiing injuries most commonly involved anterior cruciate ligament tears, whereas injuries of the patellar retinaculum and medial meniscus lesions predominated in soccer injuries. On comparison with arthroscopic diagnosis, clinical diagnosis was erroneous in about 45%. The sost common mistaken clinical diagnosis was “medial meniscus tear”. Of the 60 knee joints subjected to arthroscopy, 40 were severely enough injured to warrant surgery. Only one had normal intra-articular findings. The study demonstrates that children and adolescents can suffer knee trauma requiring surgery, despite open growth plates. Downhill skiing and soccer are particularly risky sports in this respect. Therefore, sports injuries involving haemarthrosis are clearly an indication for arthroscopy, even in childhood and adolescence. Arthroscopy enables early identification of the type and extent of intra-articular trauma and subsequent early initiation of appropriate therapy.
    Type of Medium: Electronic Resource
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