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  • 1
    ISSN: 1432-0827
    Keywords: Key words: Bone mineral density (BMD) — Dual-energy X-ray Absorptiometry (DEXA) — Cementless total hip arthroplasty — Threaded acetabular cup.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. In a prospective longitudinal study over 2 years and a separate cross-sectional study more than 5 years after operation, we analyzed periprosthetic bone mineral density (BMD) after cementless total hip arthroplasty (THA) (press-fit cementless Spotorno stem, Mecron threaded acetabular cup) by dual-energy X-ray absorptiometry (DEXA). BMD was analyzed in a longitudinal prospective study (n = 53 patients: 29 women, 24 men) and in a separate cross-sectional study (n = 23 patients: 13 women, 10 men) with good clinical outcome (Merle d' Aubigne score 〉 12). Regions of interest were defined according to Gruen (ROI 1–7) and as netto average ROI (NETAVG I) for the periprosthetic femur, and according to De Lee and Charnley (ROI I-III) and as NETAVG II for the periprosthetic acetabulum. BMD during follow-up was compared with immediate postoperative values of the affected limb. Mean precision error (CV%) was 2.6 ± 0.5% for ROI 1–7 and 1.3 ± 0.9% for ROI I–III. BMD significantly decreased in the periprosthetic femur and acetabulum during the first 3 months after operation. At the femur, BMD (NETAVG I) for women and men, respectively, was 92.4% and 87.5% at 6 months, then 89.4% and 96.2% at 2 years. ROIs around the proximal stem showed the lowest absolute values and decreased most during follow-up (to 79.9% ROI 1 and 68.2% ROI 7, respectively). Mineralization around the cup (NETAVG II), respectively, amounted to 81.1%, 82.6% at 6 months, then 80.1% and 93.8% at 2 years. The medially placed ROI II demineralized most (respectively, 72.1% and 76.7%). More than 5 years after THA, BMD in the femur showed little change, but decreased significantly to 76.4% and 79.1%, respectively, around the cup (NETAVG II). DEXA is a useful method for analyzing changes of mineralization around cup and stem of cementless THA. The results reflect the different stress on the periprosthetic bone after implantation of THA in defined ROIs, supporting earlier reported good clinical results of the Spotorno stem and increased loosening rate of threaded acetabular cups after 5 years.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 19 (1995), S. 251-254 
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Ostéosarcome extrasquelettique au développement fortement malin. En résumé, un diagnostic par biopsie et examen histologique n'est pas nécessaire dans la plupart des cas d'ossifications ou de calcifications hétérotopiques, l'étiologie du développement étant claire. Comme nous l'avons démontré, ce sont les cas de calcifications non-classifiées qui sont suspects. Une biopsie doit alors être entreprise dans les plus brefs délais.
    Notes: Summary A case of a highly malignant extraskeletal osteosarcoma is reported. Although biopsy is not considered necessary in cases of heterotopic calcification when the aetiology is known, malignancy should be suspected when the cause is questionable.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 16 (1992), S. 113-117 
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé On a entrepris, sur 40 lapins, un travail expérimental prospectif en interrompant la vascularisation de la rotule durant des périodes allant de 2 semaines à 6 mois. On a constaté qu'une ischémie prolongée entraîne des modifications notables du cartilage articulaire, comparables à celles que l'on observe chez l'homme en cas d'arthrose.
    Notes: Summary A prospective experiment was carried out in 40 rabbits in which the blood supply to the patella was interrupted for defined periods from 2 weeks to 6 months. With prolonged ischaemia, there were clear changes in the articular cartilage which were comparable with those seen in human osteoarthritis.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Der Orthopäde 27 (1998), S. 392-395 
    ISSN: 1433-0431
    Keywords: Key words Arthritis • Cementless THA ; Schlüsselwörter Rheuma • Arthrose • Zementfreie Hüft-TEP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die zementfreie Implantation von Hüfttotalendoprothesen (Hüft-TEP) bei Patienten mit einer chronisch entzündlichen rheumatischen Erkrankung ist nicht unumstritten, weil ein erhöhtes Lockerungsrisiko durch die Grunderkrankung befürchtet wird. Zwischen 1985 und 1993 wurden bei 22 Patienten mit rheumatoider Arthritis (RA), Psoriasisarthritis oder ankylosierender Spondylitis insgesamt 26 zementfreie Hüftendoprothesen implantiert. Aus einem Pool von über 600 Patienten mit primärer Koxarthrose wurden 40 Patienten mit insgesamt 41 zementfreien Hüftendoprothesen als strukturgleiche Kontrollgruppe (KG) ausgewählt. Beim Follow-up (Rheumatiker: 58 ± 27 Moante; KG: 56 ± 26 Monate) gab es in beiden Gruppen keinerlei Probleme mit den Schäften. Gelockerte und/oder gewanderte Pfannen wurden 4mal (15 %) bei den Rheumatikern (nach 44, 65, 65 und 107 Monaten) und 3mal (7 %) in der KG (nach 63, 84 und 100 Monaten) beobachtet. Pfannenwechsel fanden in der KG 2mal statt, beide innerhalb von 18 Monaten nach Primärimplantation. Bei den Rheumatikern wurde einmal im 5. Jahr nach Primärimplantation die Pfanne gewechselt. Statistisch unterschieden sich die Lockerungsraten nicht (p 〉 0.20). Innerhalb einer durchschnittlichen Beobachtungsdauer von knapp 5 Jahren scheinen die radiologischen und klinischen Ergebnisse bei Rheumatikern nicht schlechter zu sein als die einer strukturgleichen KG. Es muß aber berücksichtigt werden, daß beim Vergleich kleiner Kollektive evtl. vorhandene Unterschiede eher übersehen werden (hohes β-Fehlerrisiko).
    Notes: Summary We compared the outcome of cementless hip arthroplasty in patients with chronic rheumatic diseases (cases) and patients with osteoarthritis (controls). Between 1985 and 1993 we implanted 26 cementless hips in 22 patients with Rheumatoid Arthritis, Psoriatic Arthritis or Ankylosing Spondylitis.From a pool of more than 600 patients with Osteoarthritis we chose 40 matched controls (41 hips). Matching variables were year of implantation, age, follow-up‚eight, weight, gender and type of implant. At follow-up (cases: 58 ± 27 months; controls: 56 ± 26 Monate) no signs of loosening or migration of the stem were found, neither in the cases nor in the controls. Loose and/or migrated cups were found in 4 patients with rheumatic diseases (after 44, 65, 65 and 107 months) and in 3 patients with osteoarthritis (after 63, 84 and 100 months). Two cups were revised within 18 months in the control group, in the case group one revision was necessary after 5 years. Loosening and revision rates did not differ significantly (p 〉 0.20). Clinically, those with Osteoarthritis had a better extension (p 〈 0.02), were more satisfied with their (artificial) hips (p 〈 0.05) and did better in some activities of daily living (climbing stairs, dressing, sitting/standing up). Within a mean follow-up of 5 years the results of patients with chronic rheumatic diseases seem to be comparable to those of a matched control-group of patients with Osteoarthritis. Differences between the groups concern areas, in which rheumatic patients are handicapped due to their chronic illness. Nevertheless, we need long-term-results, before we can recommend cementless implants for these patients.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 17 (1993), S. 384-385 
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Sept cent cinq radiographies du genou ont été examinées. 17.6% montraient l'empreinte dite de Haglund. Cette image était aussi fréquente chez les malades atteints de chondromalacie que chez ceux d'un groupe de contrôle. De plus il n'a pas été trouvé de différence statistique en fonction de l'âge, du sexe ou du poids du corps. L'empreinte de Haglund est une anomalie morphologique sans signification diagnostique.
    Notes: Summary Seven hundred and five radiographs of the knee were examined and 17.6% showed a so-called Haglund imprint on the patella. The incidence was the same in patients with chondromalacia and in a control group. There was no statistical difference regarding age, sex and body weight. Haglund's imprint is a variation from the normal and is of no diagnostic value.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé  Dans cette étude nous avons analysé les résultats de la décompression de la tête fémorale chez des patients avec ostéonécrose de la tête du fémur. 94 hanches de 74 patients ont été analysées. La durée de suivi a varié entre 18 mois et 15 ans. Deux ans après la décompression les résultats ont été satisfaisants (aucune reintervention chirurgicale) dans 85% des cas avec une nécrose préoperatoire dans les stades de Steinberg 0, I ou II. Avec les stades III, IV ou V les résultats ont été satisfaisant dans 66% des cas. Quatre ans après la décompression les résultats satisfaisant ont été 73% (0, I ou II) et 55% (III, IV ou V). Six ans après la décompression les résultats satisfaisant ont été 69% et 49%. Les traitements avec corticoide, l’alccol et la nicotine augmentent le risque d’une ré intervention chirurgicale après la decompression d’une maniére significative. Les résultats de la decompréssion sont bons, si la 1ésion de la nécrose n’excéde pas le stade II de Steinberg et s’il n’a pas autres facteurs risque. Avec des facteurs de risque les résultats déclinent significativement. Dans les stades de Steinberg III, IV ou V la décompression n’est pas indiquée.
    Notes: Abstract  The results of core decompression of the femoral head in the treatment of osteonecrosis are analyzed. This study includes 94 hips in 74 patients with a follow-up time ranging between 18 months and 15 years (average 6 years). There had been no need for further surgery 2 years postoperatively in 85% of the hips with preoperative Steinberg stages 0, I and II when compared with 66% with preoperative stages III, IV and V. At 4 years postoperatively the corresponding figures are 73 compared to 55%; and 6 years postoperatively 69 compared to 49%. This difference was significant (P=0.0402). Further significant risk factors are corticosteroid administration, smoking and alcohol intake. The results of core decompression are good when the preoperative lesion is at Steinberg stage 0, I and II and the patient does not present with other risk factors. In cases with risk factors the outcome is significantly less good. The procedure is not indicated in the presence of advanced disease.
    Type of Medium: Electronic Resource
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