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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 106 (1987), S. 94-101 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Twelve surface replacement arthroplasties were performed on the hips of ten mongrel dogs using scaled-down replicas of the Wagner prosthesis. The contralateral hips and two further animals served as nonoperated controls. Animals were killed 5 months postoperatively. Clinical, radiological, histological and fluorochrome-labelling studies were employed to assess the bony and soft tissue reaction to resurfacing arthroplasty. There was no clinical or radiographic evidence of prosthetic loosening. Histological examination disclosed a thick foreign body and chronic inflammatory membrane containing acrylic cement and polyethylene wear particles at the bone-cement interface of both components. Generally, the bone marrow and trabecula were viable. There was evidence of increased bony remodelling and new bone formation in the subchondral area. The similarity between the above findings and those of aseptic component loosening in man suggests a mechanism whereby wear debris initiate a biological foreign body reaction culminating in component loosening.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 103 (1984), S. 5-12 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ein häufiges Vorkommen von Pfannenlockerungen bei Hüftgelenk-Totalprothesen wird erkennbar, seitdem Langzeitbeobachtungen zur Verfügung stehen. Die Pfannen-Verstärkungsringe von Müller und Burch-Schneider sind indiziert bei mangelhaften Verankerungsbedingungen im Acetabulum, wie sie bei Prothesenauswechslungen häufig vorkommen. Der Burch-Schneider-Verstärkungsring ist angezeigt, wenn die Schädigung des Acetabulums so hochgradig ist, daß der Müller-Ring vor der Verschraubung keinen festen Halt findet. Diese Verschraubungsringe lenken die auf das Hüftgelenk einwirkenden Kräfte unter das Pfannendach und geben außerdem der Prothesenpfanne eine Metallverstärkung. Sie haben den zusätzlichen Vorteil der Schraubenfixation, wobei bei dem Müller-Ring die Schrauben in der Richtung der resultierenden Kräfte verlaufen, die auf das Hüftgelenk einwirken. In einer einbis dreijährigen Verlaufsuntersuchung von 25 Hüftgelenkprothesen bei 24 Patienten wurde der Verankerungsring von Müller bei 20 Hüften und der von Burch-Schneider bei 5 Hüften verwendet. Die Ergebnisse waren zufriedenstellend und zeigen, daß diese Verstärkungsringe bei mangelhaften Verankerungsbedingungen im Acetabulum wertvoll sind.
    Notes: Summary A high incidence of acetabular loosening following total hip arthroplasty is emerging as long term follow-up studies become available. The Müller and Burch-Schneider acetabular supports are indicated for acetabular deficiencies which are frequently present during revision hip arthroplasty. The Burch-Schneider support is indicated where the deficiences are of such magnitude that the Müller ring does not have stable seating prior to screw fixation. These devices bring the resultant of forces across the hip joint under the acetabular roof and provide metal backing for the acetabular cup. They have the additional advantage of screw fixation which in the Müller ring is in line with the resultant of forces across the hip joint. In a one to three year follow-up of twenty-five hip replacements in twenty-four patients, the Müller support ring was used in twenty hips and the Burch-Schneider in five hips. The results were satisfactory and indicate that these supports are valuable in the treatment of patients with acetabular deficiencies.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 108 (1989), S. 159-165 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Electrical resistance rosette strain gauges bonded directly to the surface of the midshaft of the normal canine tibia were utilized to study the effect of the AO external skeletal fixator on the magnitude and orientation of the peak strain values recorded during locomotion. The application of the fixator in a single lateral bar configuration resulted in a significant decrease in surface bone strain magnitude but in only minor changes in the orientation of those strains. However, in only one of three dogs tested did the addition of a second external connecting bar result in significant further decreases in bone strain.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 104 (1985), S. 150-154 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In order to assess the response of bone to low-viscosity polymethylmethacrylate, CMW or Simplex acrylic cement was digitally packed while in a doughy state into drill holes in the proximal diaphysis in each of four long bones (humeri and tibiae) of mongrel dogs. Histological assessment was performed in areas of minimal load at the interface between the viscoelastic bone and the acrylic cement. Decalcified and undecalcified sections were evaluated and a remodeling or activity index calculated. Fluorescent labeling studies were performed in order to assess bone growth. Animals were killed at 2, 4, or 5 months. Histological analysis showed a thin connective-tissue membrane containing scattered giant cells and histiocytes at the bone-cement interface. Inflammation was not an important facet of this response. The marrow and trabecular bone were viable, except for scattered localized areas of marrow necrosis and fibrosis immediately adjacent to the cement. The bone adjacent to the cement showed a lower remodeling or activity index, fewer fluorescent bands, and smaller distances between successive bands, suggesting decreased bone formation and turnover. The etiology of these findings may include vascular disturbance secondary to disruption of the cortical and marrow circulation, temperature effects during cement polymerization, and/or chemical effects from the acrylic monomer.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 114 (1994), S. 32-34 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This is the first reported case of heterotopic ossification following total hip replacement for bilateral, rapidly destructive arthropathy of the hip. The aetiological theories of this rare condition are discussed, particularly with reference to this complication.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 113 (1994), S. 81-82 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report a case of fracture of a ceramic femoral head, which spontaneously occurred 4 years after implantation of an uncemented total hip replacement in a 48-year-old male patient with avascular necrosis of the hip. At revision surgery, the fractured ceramic head was replaced with a 32-mm metallic femoral head.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 108 (1989), S. 132-140 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An uncemented scaled down version of the Mueller SLS femoral component was inserted into 30 dogs. The material (Protasul 100), geometry, and finish were identical to those designed for clinical use. Half of the prostheses inserted were fitted out with a modular collar to improve stability. Initial stability was achieved through press fit which was made possible by the special modification of the surface area and external configuration of the prosthesis. The function of the prosthesis was assessed through clinical assessment and force plate gait analysis. This was correlated with the degree of osseous integration which was evaluated on the basis of regular radiological examinations, and at post mortem by microradiography of the serially sectioned undecalcified femurs, and histological examination of selected sections under regular and ultraviolet light. The animals were sacrificed at 4, 8, and 12 months. Force plate gait analysis revealed that all animals walked with a normal gait by the 4th post-operative month. Evaluation revealed that 29/30 femoral prostheses became successfully integrated. The prostheses without the collar were less stable and most achieved stability only by incorporation of the distal tip of the prostheses in bone and the remainder in dense fibrous tissue. The prostheses with the collar were stable and achieved without fail full bony integration. The stability was provided by appositional growth of bone which came into direct contact with the implant over the proximal 1/3 and the distal 1/3 without an intervening fibrous membrane. Despite failure of full integration of the collarless prostheses clinically and by force plate analyses the two groups were indistinguishable. Microscopic examination under ultraviolet light of the flourochrome labeled sections revealed that the bone formation and remodelling were almost complete by the 4th months. The stability achieved through press fit is enhanced by the use of a modular collar which increases the success rate of osseous integration.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 112 (1993), S. 69-70 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We report a case of a subcapital fracture that occurred after reduction and fixation of an intertrochanteric fracture of the hip with a sliding screw. The subcapital fracture occurred 4 months after surgery for the intertrochanteric hip fracture. The subcapital fracture was undisplaced and occurred in an area supported by the screw without damaging the implant. This patient was treated conservatively with bedrest.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 14 (1990), S. 221-229 
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 20 (1996), S. 244-252 
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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