Although the evidence does not clearly state U/S has been proven effective in all physiologic mechanisms in human trials I believe it is essential in practice for the quick time it allows the therapist to build rapport with the patient. I believe in the worst case there are possible placebo effects that occur. Those five minutes could be spent waiting to see the therapist or doing something that MAY be effective. I think doing what MAY be effective would be advantageous than doing nothing with that spare time.