Phonophoresis is the use of ultrasound to enhance the delivery of topically applied drugs. Phonophoresis has been used in an effort to enhance the absorption of topically applied analgesics and anti-inflammatory agents through the therapeutic application of ultrasound.  Typically, 1% Hydrocortisone cream is used when trying to evoke a local pain reduction response; however Dexamethasone or Salicylates are also often used.    The medication is applied to the skin, and then ultrasound waves are used to help pass the medicine through the skin and into your injured body part.