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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Knee surgery, sports traumatology, arthroscopy 1 (1993), S. 54-59 
    ISSN: 1433-7347
    Keywords: Knee laxity ; Dynamic X-rays of the knee ; Arthrometric knee measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Sports Science
    Notes: Abstract The comparison of bilateral dynamic X-rays in passive anterior and posterior drawer with a load of 9 kg. and the arthrometer KT 1000 measurements obtained from 100 patients before anterior cruciate ligament reconstruction, confirms the good diagnostic efficiency of the following methods: (1) radiological measurement of the anterior translation of the medial compartment, as an absolute value and especially as a differential value in relation to the opposite, uninjured knee, the normal value limits being respectively 5 and 2 mm; and (2) arthrometric measurement of the maximal manual translation, also as absolute and differential values, the normal value limits being 10 and 2 mm respectively. These two measurements have a predictive value of 90%. No numerical equivalency exists between the radiological and arthrometric values, but their variations in relation to each other are statistically correlated. The arthrometer, simple to use and totally innocuous, is an excellent test device for consultation, while dynamic X-rays allow separate studies of each compartment to look for lesions of the posteromedial or posterolateral corners.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1433-7347
    Keywords: Keywords Anatomical ¶reconstruction ; Ankle ; Instability ; Ligament ; Tenodesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Sports Science
    Notes: Abstract The clinical outcome of anatomical reconstruction or tenodesis in the treatment of chronic anterolateral ankle instability was assessed in a retrospective multicenter study. The anatomical reconstruction group (group A) consisted of 106 patients (mean age at operation 24 ± 8.4 years) and the tenodesis group (group B) of 110 patients (mean age at operation 26 ± 11.4 years). Patients were evaluated at a mean follow-up of 5.5 ± 2.8 years in group A and 5.2 ± 2.9 years in group B. The review protocol included patient characteristics, physical examination, two ankle scoring scales to evaluate the functional results, and standard anteroposterior and lateral radiographs to evaluate degenerative changes. Mechanical stability was evaluated using standardized stress radiographs. A larger number of reoperations was performed in group B (P = 0.008). At physical examination, more patients in group B had a smaller range of ankle motion than those in group A (P = 0.009). ¶A larger proportion of patients in group B had medially located osteophytes, as seen on standard radiographs (P = 0.04). On stress radiographic examination, the mean talar tilt (P = 0.001) and mean anterior talar translation (P 〈 0.001) were seen to be significantly greater in group B than in group A. There were no differences in mean Karlsson score between the groups, but more patients in group A had an excellent result on the Good score (P = 0.011). Unlike anatomical reconstructions, tenodeses do not restore the normal anatomy of the lateral ankle ligaments. This results in restricted range of ankle motion, reduced long-term stability, an increased risk of medially located degenerative changes, a larger number of reoperations, and less satisfactory overall results.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Base alumina ceramics with dispersoids (BAC) are a new class of ceramics with improved mechanical properties as compared to pure alumina. They are obtained by dispersion of powder within an alumina matrix. Of the three new ceramics studied here, A20Z possesses the best mechanical properties as well as tribological properties superior to those of pure alumina whether it is used in ceramic-ceramic or ceramic-polyethylene combination. Mechanical behaviour and tissue response afterin vivo implantation were studied. Small four-point flexion bars obtained by pressureless sintering were implanted subcutaneously in the rat. The mechanical properties were unmodified even after one year from implantation. The tissue response was studied up to one year on cylinders implanted in the paravertebral muscles of Wistar rats, and was evaluated by qualitative examination of the encapsulating membrane and measurement of its thickness in relation to pure alumina. The tissue responses were comparable for both alumina and the three tested ceramics.
    Type of Medium: Electronic Resource
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