Helmuth Kristen

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Seventy patients who had a rotationplasty for treatment of a malignant tumor in the region of the knee (the femur or the tibia) between 1974 and 1987 were followed for two to thirteen years (mean duration of follow-up, four years). Forty-seven patients had a stage-IIB osteosarcoma; the remaining twenty-three patients had a malignant fibrous histiocytoma, a(More)
In 97 cases of randomly selected children of an age from 5 to 16 weeks the angles of Hilgenreiner are determined. In relation to these findings also the influence of various factors such as hereditary anamnesis and untimely birth are observed. The so found data are compared with those published from Tönnis and Brunken. It seems that their data are higher(More)
The most predominant problem concerning malignant tumors in the lower extremities is the radical removal of the tumor, for this almost always involves amputation. Referring to the eventual outfitting of a prosthesis one must keep functionality in mind from the start. This includes all the planing for the preservation of a stump that can be fitted with a(More)
Alcohol-extracted and sterilised cylinders of ash- and birchwood were implanted into the tibia of rabbits. The selection criteria of these two wood species were thoroughly described. 28 implants were evaluated after 3, 5, 14 and 32 weeks using undecalcified microtome sections and ground sections employing polychromatic sequential-labelling and(More)
We are concerned with the formation and physics of interstellar molecular laments with wavy, sinusoidal shapes. We present NOT images of small-scale, helical structures in an elephant trunk in the Rosette nebula suggesting the presence of helical magnetic elds. These imply the presence of electric currents in the trunk. We also present the results of an(More)
In former experiments it could be shown, that new bone is formed around ashwood after implantation in the tibia of rabbits, in spite of a foreign-body tissue reaction. Equally prepared ashwood half-cylinders were now implanted in the soft tissue of rats and evaluated 2, 6, 12 and 30 weeks after implantation. Around the implants a foreign-body tissue(More)
The region surrounding the active nucleus of the barred spiral galaxy NGC 1365 is observed in the [O iii] λ5007 line and neighbouring continuum using the Faint Object Camera (FOC) aboard the Hubble Space Telescope (HST). In the continuum light numerous bright “super star clusters” (SSCs) are seen in the nuclear region. They tend to fall on an elongated ring(More)