0 which depends on the frequency at which the signal of the oscillator 3 is emitted the signal 20 has a positive portion 15 and a negative portion 16 of which the time durations are indicated respectively by t and t specifically the positive portion 15 is essentially composed in chronological order of three segments indicated respectively by 21 22 and 23 the first 21 of which defines the peak value v of said positive portion 15 the negative portion is essentially composed of a segment 24 which constitutes the prolongation of the segment 23 and defines the peak value indicated by v of the negative portion 16 this latter also comprises a region 25 of exponential extension tending to the reference value zero conveniently the values between which the peak voltage v varies lie essentially between 1 2 and 5 millivolts the length of the segment 21 is approximately double that of the segment 23 which in its turn is almost equal to the segment 24 as shown in fig3 the positive portion 15 of the signal 20 taken together with the zero voltage base line has substantially the shape of a trapezium with regard to the times the duration of the half period t is conveniently between 1 and 3 milliseconds and this range of values is to be considered essential for the purposes of the therapeutic results obtained by the method of the present invention with regard to operation certain precautions must be taken before using the device 1 for therapeutic treatment in particular the zone surrounding the fracture must be immobilized this immobilization can be entrusted to internal or external synthesis means provided they do not possess magnetic properties.