[Measurements of bone conditions with ultrasound. IV. Changes in 2 indices of bone echograms in models of untreated and of fixed fractures].

Measurements on the lower leg of a corpse and on fresh human tibiae were carried out in the diaphysis with the ultrasonoscope GA 20 by using a frequency of 1 MHz. The maximum possible transsound distance of the tibia was much smaller hitherto supposed. No alteration of the ultrasound debilitation could be observed in the model test even if a complete severance of the tibia was in hand in case the fracture crack was filled up with fluid. Changes of the transfer speed proved to be extremely small. The measuring methods with 1 MHz in order to check the process of the fracture healing are very problematic.