The object of the present invention is the method to assess the pelvic floor muscle injury, comprising the steps of applying the measuring probe into the anus, generation of electric current signals of constant amplitude, using a current generator, and applying the signals into the pelvic floor muscles by means of application electrodes (EA1) and (EA2), detection of electric voltage signals from the pelvic floor muscles by means of a plurality of measuring electrodes (EP1), EP2 . . . EPn, analysis of electric current and voltage signals for amplitude values and phase dependencies of their waveform, wherein the electric current signals and the electric voltage signals from the pelvic bottom muscles constitute signals variable in time, of the frequencies ranging from 2 kHz to 200 kHz. The object of the invention is also an electrode based measuring probe and apparatus implementing the method of assessment pelvic floor muscles injury.