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  • 1
    Electronic Resource
    Electronic Resource
    Gewebsveränderungen im Bereiche metallischer Hüftgelenke; mikroanalytische Untersuchungen mittels Spektralphotometrie, Elektronenmikroskopie und der Elektronenstrahl-Mikrosonde (1971)
    Springer
    Microchimica acta 59 (1971), S. 21-37 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Abrasive inclusions of Fluorosint (mica-reinforced Teflon) and small amounts of metal were found by means of microanalytic investigations in the binding tissue near metallic hip joints having sockets made from Fluorosint. The experience gained from this investigation has led to a series of improvements in the hip joint protheses with regard to design (fully rotational totalendoprotheses) and materials (improved chromium-cobalt based alloy-PROTASUL as well as hard, tough, wear-resistant plastic material in frictional contact with the metal).
    Notes: Zusammenfassung Abriebeinlagerungen von Fluorosint (glimmerverstärktes Teflon) und kleine Mengen Metall wurden bei mikroanalytischen Untersuchungen des Bindegewebes aus der Umgebung metallischer Hüftgelenkprothesen mit Gelenkpfannen aus Fluorosint gefunden. Bei diesen Untersuchungen gewonnene Erfahrungen führten zu einer Reihe von Verbesserungen solcher Prothesen hinsichtlich ihrer Konstruktion (Rotations-Totalendoprothese) und hinsichtlich ihres Materials (Chrom-Kobalt-Legierung PROTASUL sowie ein hartzäher, körperverträglicher, gegenüber Metall abriebfester Kunststoff).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01216878
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  • 2
    Electronic Resource
    Electronic Resource
    Long-term results after implantation of McKee-Farrar total hip prostheses (1991)
    Springer
    Archives of orthopaedic and trauma surgery 110 (1991), S. 230-237 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary From 1973 to 1976, McKee-Farrar total hip arthroplasties were performed in the Orthopaedics Department at the Centre of Pulmology. In the present study, only patients with a complete record of radiological changes at the bone/implant or bone/cement interface were evaluated. A series of 81 patients with 100 total hip prostheses in situ according to the Mayo Clinic hip score and 36 patients who had undergone 36 revision operations were studied. The design of the metal cup with metal studs at the outer surface has a favourable effect on the stability of the implant/cement combination: loosening at the implant/cement interface did not occur in any of these cases and there were few cement fractures. In spite of the metal-to-metal combination, abrasion is slight and there is no danger of metallosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572878
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  • 3
    Electronic Resource
    Electronic Resource
    Implant materials for hip endoprostheses: old proofs and new trends (1995)
    Springer
    Archives of orthopaedic and trauma surgery 114 (1995), S. 61-67 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To judge the significance of a hip joint replacement, the clinical results over 10–20 years must be evaluated. Today, still over half of all hip endoprostheses involves cement fixation. The rest is uncemented, in direct contact with bone. Total hip prostheses with polyethylene cups are equipped either with cobalt-, iron-, surface-hardened titanium-based metal or Al2O3 ceramic ball heads. The pairing Al2O3/Al2O3 and CoCrMoC metal/metal for cups and balls are extremely wear resistant. Most of the cementless cups have spherical or conical cobalt- or titanium-based metal shells with inserts made of polyethylene or CoCrMoC metal. For the fixation stems, high-strength iron-, cobalt- or titanium-based wrought metals are preferred. A taper spigot connection between metallic or ceramic ball heads and stems allows a modular design of hip joint replacements. We have learnt much from the mistakes of the last 40 years in hip endoprosthetics, and there is no excuse to repeat them again.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422826
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  • 4
    Electronic Resource
    Electronic Resource
    Concept and material properties of a cementless hip prosthesis system with Al2O3 ceramic ball heads and wrought Ti-6Al-4V Stems (1982)
    Springer
    Archives of orthopaedic and trauma surgery 100 (1982), S. 229-236 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Eine zementfreie Totalhüftendoprothese nach dem Baukastensystem wird vorgestellt. Die primär stabile Verankerung des Schaftes durch flächenförmigen Kontakt mit der Femurkortikalis ist durch die Konstruktion des Implantates gewährleistet. Der Schaft in sieben verschiedenen Größen ist aus der warmgeschmiedeten Ti-6Al-4V Protasul-64 WF-Legierung hoher Korrosionsermüdungsfestigkeit gefertigt. Die Verbindung der Biolox-Keramikkugel in drei verschiedenen Halslängen erfolgt mit einem speziellen selbsthemmenden, oberflächenstrukturierten Konus des hochfesten Schaftes. Die Keramikkugel wird mit einer Endler-Polyäthylen-Schraubpfanne in vier verschiedenen Gröβen gepaart, wobei auch hier die Verankerung im Acetabulum ohne Arkylatzement erfolgt. Dieses Hüftprothesensystem befindet sich seit 1979 in klinischer Anwendung.
    Notes: Summary A cementless total hip system of modular design is presented. The design of the stem provides for a firm seating on the cortical bone over a large area. Therefore primarily stable fixation is accomplished. The stem in seven different sizes is made of hot forged Ti-6Al-4V Protasul-64 WF alloy of high corrosion fatigue strength. The Biolox ceramic ball with three different neck lengths is connected to the high strength stem by means of a special selflocking conical spigot with a structured surface. The ceramic ball is combined with a polyethylene screw socket in four different sizes, designed by Endler and anchored in the acetabulum without acrylic cement. This hip prosthesis system has proved itself in clinical application since 1979.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00381662
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  • 5
    Electronic Resource
    Electronic Resource
    Metal-on-metal CoCrMo McKee-Farrar total hip arthroplasty: characteristics from a long-term follow-up study (1997)
    Springer
    Archives of orthopaedic and trauma surgery 116 (1997), S. 121-124 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A total of 38 cemented metal-on-metal CoCrMo McKee-Farrar total hip arthroplasties (THAs) were clinically and radiographically evaluated over a long-term follow-up. No osteolysis and no granuloma were found more than 20 years after the operation. The main radiological findings were bone erosion and migration of the acetabular component, seen in 17 hips (44.7%). The direction of the migration correlated with the setting position of the acetabular component at operation. At revision surgery, metallosis was observed in unstable THA, and no metallosis was observed in stable THA. Using a micrometer, no wear of the sockets was found. Therefore, the loosening was thought to be due to the equatorial bearing rather than to metallosis. The mean survival of the THA to data was 14.6 years in those patients 60 years old or younger at operation and was significantly less (11.9 years) in those 61 years old or older at operation (P 〈 0.03). The mean survival time was 13.8 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00426058
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  • 6
    Electronic Resource
    Electronic Resource
    Massive wear of a steel ball head by ceramic fragments in the polyethylene acetabular cup after revision of a total hip prosthesis with fractured ceramic ball (1990)
    Springer
    Archives of orthopaedic and trauma surgery 109 (1990), S. 284-287 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The purpose of this case study of severe metallosis is to draw the attention of orthopedic surgeons to extremely serious results of this kind in the event of the fracture of the ceramic ball in a total hip prosthesis. Eleven months after implantation of a KJF hip prosthesis with an aluminum oxide ceramic ball in combination with a polyethylene acetabular cup, fracture of the ceramic ball was observed. After examining the polyethylene cup during the revision operation, the operating orthopedic surgeon merely replaced the fractured ceramic ball with a metal ball head made of stainless steel. Twenty-five months after this procedure, radiography revealed massive wear of the steel ball head with resulting severe metallosis of the surrounding tissues. All prosthetic components therefore had to be removed. Careful examination of the removed prosthetic components clearly showed that sharp-edged ceramic particles originating from the fractured ceramic ball had become embedded in the bearing surface of the polyethylene cup. These tiny ceramic fragments, ranging from 0.05 to 2 mm, were too small to be seen by the operating surgeon's unaided eye. It is these extremely hard ceramic fragments that were responsible for the massive wear of the steel ball head, the hardness of which is approximately ten times less than that of aluminum oxide ceramic. The fracture of the ceramic ball further resulted in damage to the metal taper of the stemmed femoral component. In cases of this kind it is consequently absolutely essential to remove both the polyethylene cup and the ball head, and — if necessary — the femoral component as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00419946
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  • 7
    Electronic Resource
    Electronic Resource
    Metal-on-metal CoCrMo McKee-Farrar total hip arthroplasty: characteristics from a long-term follow-up study (1997)
    Springer
    Archives of orthopaedic and trauma surgery 116 (1997), S. 121-124 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A total of 38 cemented metal-on-metal CoCrMo McKee-Farrar total hip arthroplasties (THAs) were clinically and radiographically evaluated over a long-term follow-up. No osteolysis and no granuloma were found more than 20 years after the operation. The main radiological findings were bone erosion and migration of the acetabular component, seen in 17 hips (44.7%). The direction of the migration correlated with the setting position of the acetabular component at operation. At revision surgery, metallosis was observed in unstable THA, and no metallosis was observed in stable THA. Using a micrometer, no wear of the sockets was found. Therefore, the loosening was thought to be due to the equatorial bearing rather than to metallosis. The mean survival of the THA to data was 14.6 years in those patients 60 years old or younger at operation and was significantly less (11.9 years) in those 61 years old or older at operation (P 〈 0.03). The mean survival time was 13.8 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00426058
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  • 8
    Electronic Resource
    Electronic Resource
    The morphology of polymethylmethaerylate (PMMA) bone cement (1979)
    Springer
    Archives of orthopaedic and trauma surgery 94 (1979), S. 265-292 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This study deals with the correlation between the polymerizing bone cement and the surrounding tissue. The surface structures of bone cements, polymerized in air, in tissue medium (in vitro) and in human bone during implantation were investigated and compared with the contours of the tissue of the implant bed. Basing on the dimensional differences it was differentiated between contours of 1st order and 2nd order: contours of 1st order are within the macroscopic range, contours of 2nd order within the microscopic range. The surface of bone cement polymerized in living human tissue differed essentially from samples polymerized under laboratory conditions. The differences are to be seen macroscopically in the coarse relief as well as microscopically in the shape and the connection of the superficial methylmethacrylate beads. Bone cements, polymerized in air show an ideal, even and closed surface. Bone cements, polymerized in tissue medium exhibit macroscopically some wrinkles, in the microscopic range their contours are either closed (samples prepolymerized at 22°C) or partly open and partly closed (samples prepolymerized at 24°C). The surface of bone cement implants, retrieved from human bones are characterized macroscopically by a marked wrinkled and papillary relief, microscopically by flattened beads, and most often by an irregular, rough and open surface with isolated beads giving almost the impression of a porous surface structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00383411
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  • 9
    Electronic Resource
    Electronic Resource
    Darstellung reinster Kristallviolettbase (KVB) mit Hilfe von Ionenaustauschern (1961)
    Springer
    Monatshefte für Chemie 92 (1961), S. 214-218 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Die Bedeutung der Kristallviolettbase (KVB) zum Nachweis der Acidität von Baumwollen, Zellstoffen und neuerdings auch Stärken läßt ein neues Darstellungsverfahren für reinste KVB wünschenswert erscheinen. Es gründet sich auf einen möglichst äquimolar verlaufenden Ausfällungsvorgang und Verwendung von basischen Ionenaustauschern zur Entfernung auch der letzten Spuren von Anionen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153874
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  • 10
    Electronic Resource
    Electronic Resource
    Properties of implant alloys for artificial hip joints (1980)
    Springer
    Medical & biological engineering & computing 18 (1980), S. 511-520 
    Details
    ISSN: 1741-0444
    Keywords: Artificial hip joint ; Chemical composition ; Corrosion behaviour ; Iron ; cobalt ; and titanium ; based implant alloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Because the requirements demanded from implant materials for artificial hip joints are extremely high, only a very few materials are suitable for this purpose. The metallic materials standardised by the ISO still predominantly include cobalt-based alloys, in cast form for wear-resistant ball heads and in forged form for fracture-resistant anchorage stems. Forged titanium-based alloys have been also used for some years for highly stressed femoral component stems. Both alloy types exhibit a higher resistance to pitting, crevice and galvanic corrosion, stress-corrosion cracking and corrosion fatigue than wrought stainless steel of relatively low strength properties. For this reason, the inadequate material strength of hip prostheses made of the latter material is compensated for by a larger cross-section of the prosthetic stem, this depending on the geometric conditions of the femur. The decision for the selection of the implant material should be made by the orthopaedic surgeon on the basis of his clinical experience, and it should not be influeced by price considerations at the expense of the quality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02443329
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