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  • 1990-1994  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Errata: Fluctuations in nonequilibrium systems and broken supersymmetry (1994)
    Springer
    Journal of statistical physics 75 (1994), S. 1205-1205 
    Details
    ISSN: 1572-9613
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02186766
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Moderate heat treatment of bone allografts (1992)
    Springer
    Archives of orthopaedic and trauma surgery 112 (1992), S. 18-22 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The use of bone allografts is often essential in orthopedic surgery. Strict donor screening, including HIV testing 3 months postoperatively, is mandatory before a transplant may be used. Yet these measures do not definitely rule out the possibility of HIV transmission, as there is a window period before infection is revealed by blood testing. Accordingly, there is a need for virus inactivation methods that can be used on bone allografts. As radiation treatment and chemical methods have a number of disadvantages, we chose a moderate heat treatment of 65°C for a series of animal experiments. In 12 rabbit femoral condyles, moderate-heattreated bone allografts were implanted into 6-mm drill holes. Twelve normal allografts and 12 empty drill holes served as controls. Radiologic and histological evaluation up to 12 weeks postoperatively revealed slow spontaneous bone remodeling from the rim to the center of the empty cavities. Normal deep frozen allografts were quickly integrated after a short period of osteoclast reaction around the transplant, with occasional bone bridges between host and allgraft. The examination of heattreated allografts showed no differences to the controls, including morphologic aspects and the time course of osteointegration. Five zones of bone repair and osteointegration were distinguished. We conclude that thermal treatment of bone allografts has no adverse effects on osteointegration in the rabbit femoral condyle. Thus, it may contribute to improving safety in human bone transplantation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00431038
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Bone-cement removal with the excimer laser in revision arthroplasty (1992)
    Springer
    Archives of orthopaedic and trauma surgery 112 (1992), S. 15-17 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The excimer laser was thought to be an appropriate tool for the removal of bone cement without damaging the bone. However, due to its low ablation rate, its clinical use in total hip revision arthroplasty proved to be impossible. This experimental study was designed to evaluate the maximal ablation rate by adjusting the laser's parameters. Energy density, frequency, pulse duration, radiation area, quantity of pulses, and environmental conditions were varied in the experimental setup. Even with the best set of parameters the excimer laser was about ten times slower than, e.g., the carbon dioxide laser. The removal of 10 g bone cement takes about 1 h. Thus, complete cement removal by means of the excimer laser alone is not possible. However, selective application of the excimer laser in combination with other techniques could be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00431037
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Stress transfer at the femoral bone/bone cement interface as a function of the cement thickness (1993)
    Springer
    Archives of orthopaedic and trauma surgery 112 (1993), S. 65-68 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary When a cement canal prosthesis is used as the femoral component in total hip replacement (THR), the penetration depth of the bone cement can be varied according to the cement implantation pressure. Using experimental data which give a relation between the pressure applied to the cement at implantation and the resulting shape of the cement layer, a three-dimensional finite element study was performed to calculate the stress distribution at the bone/bone cement interface. The calculations show that the interface stresses increase with increasing depth of penetration by the cement layer. The explanation of this effect is that as the bone cement penetrates further into the cancellous bone, the cancellous bone is stiffened and can no longer act as a soft interposition between cortical bone and bone cement. From these results and from the clinical requirement that as little bone as possible be destroyed in any kind of alloarthroplasty, we conclude that the penetration depth of bone cement into cancellous bone in THR should be minimized to the depth necessary in order to achieve sufficient initial stability of the implant. The results show that a cement-canal prosthesis meets these requirements if a cement implantation pressure of 1.0 bar is used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420256
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    Paper (German National Licenses)
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  • 5
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    Unknown
    Petrographie und Lithogeochemie eines Ultramafit Diapirs in der Nähe der Rodrigues Triple Junction (RTJ), Zentraler Indischer Ozean (1994)
    In:  Berichte der Deutschen Mineralogischen Gesellschaft : Beihefte zum European Journal of Mineralogy ; 6, 1
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/conferenceObject
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  • 6
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    Unknown
    Quantification of gases dissolved in drilling mud - Results from the KTB - (1993)
    In:  KTB Report 93-2: Contributions to the 6. Annual KTB-Colloquium, Geoscientific Results; Giessen 1.-2. April 1993
    Details
    Publication Date: 2023-11-15
    Language: English
    Type: info:eu-repo/semantics/bookPart
    Format: application/pdf
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