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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Der Orthopäde 26 (1997), S. 251-257 
    ISSN: 1433-0431
    Keywords: Schlüsselwörter Hüftprothese ; Zementfreie Prothese ; Computergesteuerter Robotereinsatz ; Präoperative Planung ; ROBODOC ; Key words Hip replacement ; Cementless implant ; Robot-assisted surgery ; Preoperative planning ; ROBODOC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Computer-guided robot-assisted surgery in cementless total hip replacement requires exact preoperative planning at the 3D workstation Orthodoc. Only the Robodoc procedure allows the precise execution of the preoperative plan in surgery. Robot-assisted surgery has been undergoing clinical evaluation at the Berufsgenossenschaftliche Unfallklinik, Frankfurt, since November 1994. In all 465 patients, the preoperative plan was successfully carried out intraoperatively. The high precision in reaming, leading to a superb bone implant contact, guarentees absolute initial stability and is likely to promote primary healing between implant and bone. The common and often published incidence of varus or valgus malpositioning and any fractures or fissures could be avoided through the use of Robodoc. Although immediate full-weight bearing was strongly recommended to the patients, no implant subsidence was seen in the regular follow-up X ray studies. In der Literatur beschriebene Varus- sowie Valgusfehlstellungen sowie intraoperativ aufgetretene Frakturen bzw. Fissuren konnten bei der Anwendung dieser Operationsmethode vermieden werden. Trotz sofortiger erlaubter postoperativer Belastung konnte eine Sinterung des Prothesenschaftes auch bei den regelmäßig durchgeführten Verlaufskontrollen nicht nachgewiesen werden.
    Notes: Zusammenfassung Der computergesteuerte Robotereinsatz bei der Implantation einer zementfreien Prothese erfordert eine exakte präoperative Planung am dreidimensionalen Graphik-Computer (Orthodoc). Erstmals ist es mit diesem Verfahren möglich, daß die in 3 Ebenen erfolgte Planung durch den computergesteuerten Robotereinsatz am Patienten umgesetzt werden kann. Seit Herbst 1994 wird an der Berufsgenossenschaft Unfallklinik Frankfurt am Main dieses Verfahren eingesetzt. Bei bisher 465 operierten Patienten konnte in allen Fällen die präoperative Planung intraoperativ umgesetzt werden. Es kann davon ausgegangen werden, daß aufgrund eines wesentlich verbesserten Knochenkontaktes, bedingt durch die hohe Präzision beim Fräsvorgang und der dadurch erreichbaren hohen Primärstabilität ein besseres Anwachsverhalten durch den Knochen gegeben sein wird.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-2451
    Keywords: Key words Crohn’s disease ; Cytolytic activity ; Inflammatory bowel disease ; Intraepithelial lymphocytes ; Natural killer cells ; T cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Background and aims: Dysfunction of the immune system with inappropriate responses of lymphocytes to various antigens has been implicated in the development of Crohn’s disease. Therefore, the functional and phenotypic characteristics of intestinal intraepithelial lymphocytes (IEL) in comparison to peripheral blood lymphocytes (PBL) were analyzed in patients with and without Crohn’s disease. Patients and methods: Six patients with Crohn’s disease and six control patients were studied. Isolated IEL and PBL were tested for cytolytic activity against the human adenocarcinoma cells DLD-1 and the human leukemia cells K562 in a 51Cr-release assay. Two-color flow cytometry was performed for phenotype analysis of isolated lymphocytes. Results: IEL from patients with Crohn’s disease showed significantly increased cytolytic activity against epithelial-derived target cells when compared with IEL from control patients. In contrast, no functional changes were detectable among PBL from patients with Crohn’s disease. IEL from patients with Crohn’s disease contained a significantly higher percentage of CD8+ lymphocytes when compared with IEL from control patients, whereas no phenotypic changes were observed among PBL. Conclusions: In Crohn’s disease, the functional and phenotypic changes of T cells are limited to lymphocytes of the intestinal mucosa. Furthermore, it is conceivable that the increased cytolytic activity of IEL contributes to the tissue damage in this disease.
    Type of Medium: Electronic Resource
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