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  • 1
    Electronic Resource
    Electronic Resource
    MRI of posttraumatic cyst-like lesions of bone after a greenstick fracture (1997)
    Springer
    European radiology 7 (1997), S. 1218-1220 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Bone cysts ; Fractures ; Complications ; Cortical defect ; MRI greenstick fractures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Posttraumatic bone-cyst formation is a known but rare process. Typical location is the distal radius, usually as a result of a greenstick fracture. The pathogenesis is unknown; however, subperiosteal migration of fat or hemorrhage with later absorption may cause cyst formation. We present the first reported case of MR imaging of this lesion. At MRI subperiosteal hemorrhage was found to be the cause of cyst formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050278
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  • 2
    Electronic Resource
    Electronic Resource
    Acute calcific tendinitis of the pectoralis major insertion associated with cortical bone erosion (1997)
    Springer
    European radiology 7 (1997), S. 1215-1217 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Tendinitis ; Bone resorption ; Cortical defect ; MRI ; CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. A case of calcific tendinitis of the pectoralis major insertion with cortical bone erosion is presented. Clinical and laboratory findings showed a significant inflammatory reaction. Both CT and MR images demonstrated the extent of the lesion providing additional information on the dimensions of inflammatory soft tissue and bone marrow reaction. Biopsy was performed and histology revealed the typical features of calcification, inflammation and giant cell reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050277
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  • 3
    Electronic Resource
    Electronic Resource
    222. Der veraltete vordere Kreuzbandschaden: Plastiken und Alternativtechniken (1977)
    Springer
    Langenbeck's archives of surgery 345 (1977), S. 654-654 
    Details
    ISSN: 1435-2451
    Keywords: Anterior Cruciate ligament, repair of rupture ; Vorderer Kreuzbandschaden
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: ZusammenfaBung An Hand von 152 nachuntersuchten Kniegelenken werden verschiedene Techniken zum Ersatz des vorderen Kreuzbandes dargestellt. Geeignet sind gestielte Sehnen aus der Pes anserinus-Gruppe oder ein freies Transplantat aus dem zentralen Drittel des Ligamentum patellae. Kombinierte, statisch-dynamische MaBnahmen am Kapselbandapparat sind bei rotatorischen Instabilitäten notwendig, so die Technik nach Nicholas bei antero-medialer, bzw. das Verfahren nach Maclntosh bei antero-lateraler Rotationsinstabilität, die empfohlen werden können.
    Notes: Summary The results of postoperative examinations of 152 late reconstructions of the anterior cruciate ligament using different methods are shown. The free ligamentum patellae transplant of the central third and the distally attached tendoplasty from the pes anserinus group show the best results. Rotational instabilities have to be dealt with according to the type of instability. The techniques of Nicholas for anteromedial rotational instability and of Maclntosh for anterolateral instability seem to be succeBful.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01305668
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  • 4
    Electronic Resource
    Electronic Resource
    The prognosis of skeletal metastases (1998)
    Springer
    Der Orthopäde 27 (1998), S. 294-300 
    Details
    ISSN: 1433-0431
    Keywords: Key words Osseous metastasis • Prognosis • ; Surgical resection • Long-term survival ; Schlüsselwörter Skelettmetastasen • Prognose • Operative Therapie • Langzeitüberleben
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die operative Therapie der Skelettmetastasierung wird angesichts zunehmender Überlebenszeiten der Karzinompatienten an Bedeutung gewinnen. Anhand 228 eigener Fälle mit ossärer Metastasierung, operativ versorgt zwischen 1980 und 1993, fand sich das Gesamtüberleben mit 49 % nach einem Jahr, 32 % nach 2 Jahren, 22 % nach 3 Jahren und 11 % nach 5 Jahren. In einer retrospektiven Analyse konnten Mamma- und Schilddrüsenkarzinom als signifikant prognostisch günstig, das Bronchialkarzinom als prognostisch ungünstig festgestellt werden. Hauptfaktor war insbesondere das Vorliegen extraossärer Metastasen. Die Anzahl der ossären Läsionen erwies sich lediglich bei Mamma- und Nierenkarzinom unter der Bedingung keiner weiteren Organbeteiligung als prognostisch signifikant. Alter und Lokalisation der Metastasen im Skelett blieb ohne Relevanz. In Abhängigkeit der genannten Faktoren wurden drei Subgruppen mit ungünstigen, medianen und günstigen Verläufen definiert. Die dargestellten Parameter könnten zur differenzierten Selektion von Indikation und Radikalität des Vorgehens beitragen und Morbidität und Hospitalisationszeiten bei limitierter Prognose reduzieren.
    Notes: Summary Surgical resection of osseous metastases is becoming more and more important in obtaining longer overall survival in carcinoma patients. In 228 cases surgically treated at our institution between 1980 and 1993, the survival was 49 % after 1 year, 32 % after 2 years, 22 % after 3 years and, finally, 11 % after 5 years. Retrospectively evaluated, breast and thyroid carcinoma proved to be of positive prognostic influence and lung cancer of negative significance. As a main significant parameter, further extraosseous metastases were evaluated. The prognostic influence of the number of osseous lesions could only be demonstrated in breast and renal cell carcinoma without involvement of further organs. Age and location of the skeletal lesions proved to be of no prognostic influence. Based on these prognostic parameters, three subgroups of patients with worse, median and good long-term survival could be defined. In conclusion, the indication and amount of surgery can be based on these prognostic factors, leading to a decrease in morbidity and hospitalization time in patients with limited survival.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00003500
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  • 5
    Electronic Resource
    Electronic Resource
    Vergleichende tribologische Untersuchungen von Chirulen®, Hylamer® und Enduron® gepaart mit Al2O3 (1997)
    Springer
    Der Orthopäde 26 (1997), S. 125-128 
    Details
    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
    URL: http://dx.doi.org/10.1007/PL00003366
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  • 6
    Electronic Resource
    Electronic Resource
    Experimentelle Untersuchungen an Metall-Metall-Gleitpaarungen und ihre Wertigkeit hinsichtlich eines zu erwartenden In-vivo-Verhaltens (1997)
    Springer
    Der Orthopäde 26 (1997), S. 135-141 
    Details
    ISSN: 1433-0431
    Keywords: Schlüsselwörter Metall-Metall-Gleitpaarungen ; Experimentelle Untersuchung ; Key words Metal-on-metal couplings ; Experimental investigation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A simulator test was carried out in the hip joint simulator on a metal-on-metal coupling of a modified CoCrMo alloy. The test was run up to 1.9 million cycles and the tribological behaviour of the coupling was documented by means of roundness measurements and scanning electron microscopy. It is seen that the tribological system metal on metal is characterized by mixed friction in the artificial hip joint, thus generating material contacts that are documented by the roundness variation and by the SEM contact zone analysis, showing „three-body“ wear of this system. The roundness variations indicate that running-in wear is to be noticed at first with a decreasing tendency over the 1.9 million cycles. Nevertheless, this observation does not allow any prognosis as to the wear rates in the case of a higher number of cycles. It must be taken into consideration that aqua destillata had to be used as a lubricant for technical reasons; the use of serum/Ringer solution might have produced different results. Further investigations in the hip joint simulator and on revised metal-on-metal couplings will be carried out in this respect.
    Notes: Zusammenfassung An einer Metall-Metall-Gleitpaarung aus einer modifizierten CoCrMo-Legierung wurde ein Simulatorversuch bis 1,9 Mio. Zyklen unternommen und die Ergebnisse des tribologischen Verhaltens sowohl über Rundheitsvermessungen als auch über eine rasterelektronenmikroskopische Analyse der Tribokontaktzonen dokumentiert. Als Ergebnis dieser Untersuchungen ist festzuhalten, daß sich das Tribosystem Metall/Metall im künstlichen Hüftgelenk im Mischreibungsgebiet befindet und es demnach zu Materialkontakten kommt, die einerseits die Veränderung der Rundheit zur Folge haben, andererseits sich in der rasterelektronenmikroskopischen Tribokontaktzonenanalyse zeigt, daß das System sog. Dreikörperverschleiß aufweist. Die Ergebnisse der Rundheitsabweichungen deuten darauf hin, daß es zunächst zu einem Einlaufverschleiß kommt, der dann im Laufe der durchlaufenen 1,9 Mio. Zyklen eine eher abnehmende Tendenz erfährt, wobei allerdings eine Prognose des zu erwartenden Verschleißergebnisses für größere Lastspielzahlen nicht möglich ist. Die gefundenen Ergebnisse müssen u. a. unter dem Aspekt gesehen werden, daß als Zwischenstoffmedium aus verfahrenstechnischen Gründen Aqua dest. benützt wurde und eine Verwendung von Serum-Ringer-Lösungsgemisch hier möglicherweise andere Ergebnisse zeitigt. Weitere Untersuchungen im Simulator sowie an revidierten Metall-Metall-Paarungen folgen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00003368
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  • 7
    Electronic Resource
    Electronic Resource
    Ein neues resorbierbares Knochen-Knorpel-Ersatztransplantat (2000)
    Springer
    Der Orthopäde 29 (2000), S. 151-157 
    Details
    ISSN: 1433-0431
    Keywords: Schlüsselwörter Bioimplantat • Biomechanik •¶Knorpeldefekt • Knorpelregeneration •¶Mesenchymale Zelldifferenzierung ; Key words Bioimplant • Biomechanics • Cartilage ¶defect • Cartilage repair • Mesenchymal cell differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Hyaline cartilage is thought to be unable to regenerate. All efforts so far – including autologous chondrocyte cell transplantation – to reconstruct cartilage defects in joints have not been totally convincing. However, mesenchymal cells are able to differentiate into chondrocytes under mechanical pressure conditions. In this study, an open porous resorbable two-layer “bioimplant” was constructed in which mechanical pressure was exerted onto mesenchymal cells when migrated into the open porous structure of the bioimplant. Differentiation of the cells into chondrocytes was thus induced. The bioimplants were implanted into the medial condyles of nine rabbits and left in place for eight or twelve weeks, respectively. In seven of these cases, cartilage formation was found, in contrary to the controls in which only connective tissue and bone had grown into the empty holes. The new bioimplants have proven their effectiveness in cartilage defect repair and might evolve in the future as a new alternative treatment of full thickness defects of joint surfaces.
    Notes: Zusammenfassung Gelenkknorpel gilt in der Regel als nicht regenerationsfähig. Bis jetzt durchgeführte Versuche zur Wiederherstellung des Gelenkknorpels, inklusive der Knorpelzelltransplantation, zeigten wenig erfolgversprechende Ergebnisse. Jedoch gibt es Hinweise, dass unter Druckbelastung mesenchymale Stammzellen sich in Knorpelzellen differenzieren können. In der vorliegenden Studie wurde ein offenporiges resorbierbares, zweischichtiges „Bioimplantat“ konstruiert, das nach Implantation in einen Knochen-Knorpel-Defekt die physiologischen Druckverhältnisse nachahmt und so eine Differenzierung von mesenchymalen Stammzellen zu hyalinem Knorpel ermöglicht. An 9 Kaninchen wurde dieses Bioimplantat an Knochenknorpeldefekten des Femurkondylus über 2 verschiedene Zeiträume erprobt und mit Leerlochversuchen verglichen. Durch die Bioimplantate gelang es im Gegensatz zu den Leerlochversuchen in 7 von 9 Fällen Bereiche mit hyalinartigem Knorpel zu induzieren. Die Methode scheint einen neuen erfolgsversprechenden Ansatz zur Reparation von Knorpeldefekten darzustellen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00003710
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  • 8
    Electronic Resource
    Electronic Resource
    A study of the synovial and ligamentous structure of the anterior cruciate ligament (1987)
    Springer
    International orthopaedics 11 (1987), S. 117-124 
    Details
    ISSN: 1432-5195
    Keywords: Anterior cruciate ligament ; Synovium ; Structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Etude microscopique de 16 ligaments croisés antérieurs (L. C. A.) prélevés post-mortem en conservant la continuité topographique de leur structure synoviale et ligamentaire. Le revêtement synovial du L. C. A. se compose de trois types différents de tissu: fibreux, aréolaire et aréolo-adipeux. La synoviale elle-même est constituée de deux couches dont la seconde partie, la sous-synoviale, se différencie en une partie périphérique, fibreuse et dense et une partie faite de tissu conjonctif lâche, porteur des structures vasculaires et nerveuses. Le tissu collagène du L. C. A., le vrai tissu fonctionnel, contient environ 1500 fascicules d'un diamètre moyen de 250 μm. Ces fascicules sont constitués de faisceaux de fibres collagènes, de fibrocytes et de protéoglycans. Les structures synoviales et ligamentaires sont reliées entre elles par l'intermédiaire de la couche sous-synoviale qui irradie dans le tissu ligamentaire dont elle engaîne les fascicules. Ainsi est établie une connexion biologique entre ces deux structures. Les conséquences de cette étude sur la réparation chirurgicale des ruptures récentes du L. C. A. sont discutées.
    Notes: Summary The synovial and ligamentous structure of 16 human anterior cruciate ligaments (ACL), removed at autopsy, were examined by light microscopy with special regard to their topographical relationships. The soft tissue support of the ACL consists of fibrous, areolar and areolo-adipose synovial tissue. The subsynovial layer comprises a tight fibrous peripheral part and an element of loose connective tissue containing some tight connective tissue strands, vessels and nerves. The collagenous ligamentous part of the ACL is the proper functional tissue and contains approximately 1500 fascicles measuring an average of 250 μm in diameter. These fascicles are composed of bundles of collagen fibres, fibrocytes and deposits of proteoglycans. The synovial and ligamentous structures are attached by the second part of the subsynovial layer, which radiates into the ligamentous tissue and envelops the fascicles like a sheath. By this means the biological connection between these two structures is guaranteed. The relevance of these findings to operative reconstruction of recent ligamentous injuries is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266696
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  • 9
    Electronic Resource
    Electronic Resource
    Clinical results and radiologic findings after cementless implantation of PCA stems in total hip replacement (1992)
    Springer
    Archives of orthopaedic and trauma surgery 111 (1992), S. 305-308 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The results of radiologic and clinical follow-up of 81 PCA (porous coated anatomic) hip joint prostheses implanted in our clinic between 1986 and 1988 are presented. One of the prostheses had to be explanted because of aseptic loosening after 2.5 years' implantation. Contrary to the fixation concept of the prosthesis, which requires both proximal osseointegration and free axial shifting of the distal part of the prosthesis, our follow-up radiographs showed proximal lysis of 2 mm and more as well as distal hypersclerosis of 3 mm and more in the form of endosteal bone formation in 70% of cases 3 years after implantation. On the basis of our data, the question whether these bone reactions will finally lead to aseptic loosening of the implant cannot be answered yet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420055
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  • 10
    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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