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R Behrend

Publications and source records attributed to R Behrend.

8 recordsLinked to original sources
PubMed2006

Charon's size and an upper limit on its atmosphere from a stellar occultation.

Pluto and its satellite, Charon (discovered in 1978; ref. 1), appear to form a double planet, rather than a hierarchical planet/satellite couple. Charon is about half Pluto's size and about one-eighth its mass. The precise radii of Pluto and Charon have remained uncertain, leading to large uncertainties on their densities. Although stellar occultations by Charon are in principle a powerful way of measuring its size, they are rare, as the satellite subtends less than 0.3 microradians (0.06 arcsec) on the sky. One occultation (in 1980) yielded a lower limit of 600 km for the satellite's radius, which was later refined to 601.5 km (ref. 4). Here we report observations from a multi-station stellar occultation by Charon, which we use to derive a radius, R(C) = 603.6 +/- 1.4 km (1sigma), and a density of rho = 1.71 +/- 0.08 g cm(-3). This occultation also provides upper limits of 110 and 15 (3sigma) nanobar for an atmosphere around Charon, assuming respectively a pure nitrogen or pure methane atmosphere.

Journal Article↗
PubMed1994

Intraarticular hip treatment with triamcinolonehexacetonide in juvenile chronic arthritis.

To evaluate the effect and tolerance of intraarticular Triamcinolonehexacetonide (TCH) in the course of chronic coxitis in juvenile chronic arthritis (JCA) in an open uncontrolled study. Since 1990 we treated patients < 16 years of age suffering from chronic coxitis with 1 mg/TCH/KG body weight. The patients were checked again 4-8 weeks after the treatment. Clinical and ultrasound courses were recorded with the help of ultrasound and joint scores. The evaluation took place 6, 12, 24 and 36 months after the treatment. At that time we give a report on the 12 months follow-up of 37 hip joints and the 24 months follow-up of 20 hip joints. The immediate effect of TCH influencing mobility, pain sensitivity and joint effusions of the patients is impressing. The long term effect of TCH has to be evaluated by regular check ups for at least 2 years. An individual comparison with the not treated contralateral joint would be desired if ethically justifiable. Most patients suffering from polyarticular diseases with a long course of coxitis needed more than one injection of TCH (mean reinjection time 5.8 months). Any avascular necrosis of the femoral heads or other complications were not observed.

Adolescent↗
PubMed1993

[Ultrasonographic diagnosis in inflammatory-rheumatic changes of the shoulder joint].

Inflammatory rheumatoid changes of the shoulder joint are often diagnosed rather late, so therapy is largely directed towards pain reduction and less towards maintenance of full joint function. When considering the mutilating type of chronic polyarthritis, it becomes evident how important the role of the shoulder joint is in the patients performance of basic everyday activities. In this paper the important structures of the shoulder joint that can be visualized by ultrasound are described as to their rheumatological significance, and pathological findings are discussed along with the appropriate therapy.

Acromioclavicular Joint↗
PubMed1987

[Spontaneous liver rupture in eclampsia].

We report on a case of a 34-year old nullipara who suffered from rupture of the liver during eclampsia and survived despite most serious complications. Most cases of rupture of a non-traumatic subcapsular haematoma of the liver during pregnancy are associated with symptoms of pre-eclampsia. The pathogenesis of this severe complication as well as diagnostic imaging and surgical treatment are discussed. The classical trias of pre-eclampsia, epigastric pain and sudden circulary collapse may vary considerably. Since early diagnosis is crucial for maternal and foetal outcome, a subcapsular haematoma of the liver should be considered in women during pregnancy and childbed presenting with pre-eclampsia and upper abdominal pain. Here ultrasonographic imaging is a valuable and readily available diagnostic tool for the obstetrician.

Adult↗
PubMedDate not supplied

[Methods of surface measurements in idiopathic scoliosis].

The radiologic evaluation of scoliotic spines is a well established, exact method. In long follow-up histories these patients aquire a remarcable radiation exposure. Measurement of additional clinical parameters intends since decades to minimize this exposure. Documentation of surface deformities follows the presumption of a correlation between these and the radiologic angles. The analysis of 714 completely documented untreated idiopathic scoliotic curves showed a good overall correlation between surface deformity and Cobb angle, but single measurements varied too widely to make the used surface documentation a real alternative to x-rays. Treated scoliosis patients pose additional problems in the evaluation, a any treatment - brace and operation - further diminish the correlation. Obviously the usual clinical surface evaluation can only document the cosmetic appearance. Regular radiologic follow-up stays inevitable especially in treated scoliotic patients.

Adolescent↗
PubMedDate not supplied

[Sonographic assessment of typical lesions in shoulder dislocation].

The traumatic dislocation of the shoulder joint is the most often joint luxation. The involved patients are often sporting and between the age of 20 to 40 years. The therapeutic and prognostic point of interest is to recognize and reconstruct injured structures. Among the soft tissue injuries the Bankart lesions, among the osseous injuries the Hill-Sachs defect are numeric well to the fore. Hitherto existing diagnostic methods for these injuries are either invasive or with X-rays. Its is demonstrated, that dynamic ultrasonography examination of the shoulder joint can visualize besides the rotator cuff abnormalities of the labrum glenoidale and the caput humeri outline.

Adult↗
PubMedDate not supplied

[Early experiences with the total mini hip-joint endoprosthesis (St. George Mini model) in dysplasia coxarthrosis].

The results of 106 patients with osteoarthritis secondary to severe congenital hip dysplasia and dislocations of the hip operated at the Endo-Klinik were evaluated after an average follow up of 21 months. 142 "St. Georg-Mini" total hips were implanted employing Refobacin-Palacos R. The clinical results were graded as "combined performance" which considered hip pain, walking distance, hip mobility and walking aids. In 93% of the cases "combined performance" was improved at follow up and 91.7% of the patients were satisfied with the result. The early (during hospitalization) and late (after discharge from hospital) complication rate which had an influence on the result at follow up was 2.1% (n = 3) and 3.5% (n = 4) respectively. There were no deep infections. An extended indication for total hip arthroplasty also for younger patients with severe osteoarthritis secondary to hip dysplasia is discussed and can be advocated.

Adult↗