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Biomedical subjects

S Markert

Publications and source records attributed to S Markert.

5 recordsLinked to original sources
PubMed2003

[Preliminary results with Cuénod's osteoligamentoplasty and capsulodesis for treatment of chronic scapholunate dissociation].

Until now, the ideal treatment of scapholunate dissociation has not yet been found. Cuénod described an operation with reconstruction of the dorsal part of the scapholunate ligament using a bone-ligament-bone autograft (dorsal trapezoidometacarpal II ligament) and an additional dorsal capsulodesis using the dorsal intercarpal ligament. From December 2000 until January 2002, we operated on twelve patients with symptomatic chronic scapholunate dissociation without signs of osteoarthrosis using Cuénod's procedure. Preoperatively as well as at follow-up patients were evaluated using a traditional wrist score and a DASH-questionnaire in addition to clinical examination. X-rays of both wrists in two planes each and additional stress radiographs were done. All patients had an arthroscopy preoperatively and a CT scan before K-wire removal. The mean follow-up time was twelve months. Clinical follow-up showed good results (traditional wrist score: 77 points; DASH-score: 27 points), but with regard to the good preoperative findings (traditional wrist score: 73 points; DASH-score: 28 points) no significant improvement. Postoperative X-rays showed a correction of static instability in three cases; in four cases we found a recurrent SL gap, which was interpreted as failure of the transplanted ligament. Until now, one patient had to be reoperated by STT-fusion. In our patients, Cuénod's operation showed different results. So, further studies are necessary to find the correct indications for applying this procedure.

Adult↗
PubMed2002

Comparing light sensitivity, linearity and step response of electronic cameras for ophthalmology.

PURPOSE: To develop and test a procedure to measure and compare light sensitivity, linearity and step response of electronic cameras. METHODS: The pixel value (PV) of digitized images as a function of light intensity (I) was measured. The sensitivity was calculated from the slope of the P(I) function, the linearity was estimated from the correlation coefficient of this function. To measure the step response, a short sequence of images was acquired. During acquisition, a light source was switched on and off using a fast shutter. The resulting PV was calculated for each video field of the sequence. RESULTS: A CCD camera optimized for the near-infrared (IR) spectrum showed the highest sensitivity for both, visible and IR light. There are little differences in linearity. The step response depends on the procedure of integration and read out.

Equipment Design↗
PubMed1994

Sexual behaviour of gay and bisexual men in eight European countries.

To compare the sexual behaviour and HIV risk reduction strategies of gay and bisexual men in Europe, a survey, disseminated via the gay press and gay associations, was conducted amongst gay and bisexual men in Austria, Switzerland, Germany, Denmark, France, Great Britain, Italy and the Netherlands during the autumn and winter of 1991. By end March of 1992, 12,347 completed questionnaires had been obtained. A preliminary analysis shows striking similarities in patterns of sexual behaviour of gay men in the 8 European countries but indicates that strategies of risk management concerning HIV and AIDS vary widely. While the majority of gay men have multiple partners, and intercourse is more common with stable partners than with causal partners. The proportion of men who, during the past 12 months, engaged in unprotected anal intercourse with a partner with different or unknown HIV-status ranged from 1/3 in East Germany to 1/6 in UK. However, reported incidence over the past 12 months of STDs, other than HIV infection, was similar in all countries (2%-3%). The reported HIV antibody prevalence varied from less than 7% in East Germany, Italy and the United Kingdom to 15% in Denmark and 17% in France. HIV risk reduction strategies appear to be most common in those countries where the gay community had been included in targeted prevention campaigns during the early phase of the AIDS epidemic. Considering the high proportion of gay men engaging in high risk activities it is imperative that prevention efforts are sustained and improved.

Acquired Immunodeficiency Syndrome↗