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Biomedical subjects

A Höfer

Publications and source records attributed to A Höfer.

3 recordsLinked to original sources

[Early management of a fracture of the coxal end of the femur in elderly patients].

The demographical structure of the Federal Republic of Germany leads to an increasing number of very old patients in traumatology. Even minor accidents can cause severe injuries including operative treatment. In this retrospective study the data of 219 patients older than 70 years who had to undergo an operation at the femoral neck region are analyzed. The aim of operative management was a very early operation and a fixation device, that allows an immediate full weight-bearing. Fractures of the femoral neck are stabilized by hemiarthroplasty, fractures of the trochanteric region with the dynamic hip screw. 90% of our patients could be operated within 24 hours, the mortality rate during the first 14 days was 3%.

Aged

[Program for calculating diagnostic x-ray spectra].

A code written in BASIC is described which calculates x-ray spectra for tube voltages from 20 to 150 kVDC. Data for the spectral distribution, the mean photon energy, kerma in air, mean energy of the kerma distribution together with 1. and 2. half-value layers for aluminum are obtained. Numerical values for the differential energy intensity function and the Thomson-Whiddington constant were taken from Birch et al. (6). For target angles up to 30 degrees agreement between calculated and experimental data is good. For larger angles some discrepancies appear which could be either due to increased filtration by tungsten (surface roughness) or limited applicability of the data used. The program is tailored to be run on a personal computer.

Humans