An instrument for locating defects adjacent neural elements in bone tissue includes a handle member with a rotatable coupling member and a probe member coupled to the coupling member. The probe member extends distally from the handle member and includes a longitudinal shaft portion along a longitudinal axis and a distal angled portion extending transversely to the longitudinal axis. The angled portion has a probe end that carries an electrical signal. The handle member operates to rotate the probe member and the probe end about the longitudinal axis to sweep holes in the bone tissue to locate possible defects in the bone tissue.
