A closer look at the sound-wave technique physical therapists use to push anti-inflammatory medication straight into sore joints and muscles — no needle required.
Chicago Chiropractic & Sports Injury Centers Skokie · Loop · West Loop
If your shoulder has been barking at you for weeks, or your plantar fasciitis flares up every time you lace up your running shoes, you’ve probably heard your physical therapist mention phonophoresis. It’s one of those clinical words that sounds more intimidating than the treatment actually is. In plain terms, phonophoresis is a way of getting topical medication deeper into your tissue using ultrasound waves instead of an injection. No needles, no downtime, and it’s usually folded right into a regular physical therapy session.
This guide breaks down exactly what phonophoresis is, how it works, what it treats, and what to expect if your physical therapist in Chicago recommends it for you.
No needles – Medication delivered through the skin
5–10 min- Typical treatment time per session
1 MHz – Common ultrasound frequency used
What Is Phonophoresis?
Phonophoresis (sometimes called sonophoresis or ultrasonic drug delivery) is a physical therapy modality that uses therapeutic ultrasound to drive medicine — usually an anti-inflammatory or corticosteroid gel — through the skin and into the tissue underneath. Instead of swallowing a pill or getting a shot, the medication is applied topically, and sound waves essentially “push” it past the skin barrier and toward the inflamed tendon, ligament, or muscle that needs it most.
It’s closely related to ultrasound therapy, which uses the same equipment to generate deep heat and improve circulation, but without the added medication step. Many clinics, including ours, offer both as part of a broader physical therapy plan.
How Does Phonophoresis Work?
During treatment, your physical therapist applies a topical medication often a nonsteroidal anti-inflammatory gel — directly to the affected area. A handheld ultrasound device is then moved slowly over the skin in small circular motions. The high-frequency sound waves vibrate the tissue at a microscopic level, which temporarily increases the permeability of the skin and encourages the medication to absorb more deeply than it would on its own.
A 2022 systematic review published in Scientific Reports found that phonophoresis with NSAID gel meaningfully improved pain and function scores in knee osteoarthritis patients, particularly when corticosteroid gels were used, supporting what physical therapists have observed clinically for years.
Phonophoresis vs. Iontophoresis
These two are easy to mix up. Phonophoresis uses sound waves to push medication into the tissue, while iontophoresis uses a mild electrical current to do the same job. Your physical therapist chooses between the two based on your condition, the medication being used, and how your skin responds to each method.
What Conditions Can Phonophoresis Treat?
Phonophoresis is most often used for soft-tissue and joint conditions where inflammation sits close enough to the skin surface for the ultrasound to reach it. Common uses include:
- Tendinitis and tendinopathy (shoulder, elbow, Achilles)
- Plantar fasciitis and other foot or heel pain
- Bursitis in the shoulder, hip, or knee
- Mild to moderate osteoarthritis pain
- Carpal tunnel syndrome and other repetitive strain injuries
- Muscle spasms and localized soft-tissue inflammation
- Scar tissue adhesions following surgery or injury
It’s rarely used as a standalone fix. Instead, your physical therapist typically pairs it with therapeutic exercise, trigger point therapy, or manual techniques to address the underlying cause of the pain, not just the symptom.
What to Expect During a Phonophoresis Session
- Assessment: Your physical therapist examines the injured area and confirms phonophoresis is appropriate for your condition and skin sensitivity.
- Gel application: A topical medication is applied directly over the target tissue.
- Ultrasound pass: A handheld ultrasound wand is moved in slow, steady circles for roughly 5 to 10 minutes.
- Sensation check: Most patients feel nothing more than a mild warmth or slight tingling — it shouldn’t hurt.
- Follow-up care: Phonophoresis is usually one part of a full visit that may also include stretching, strengthening, or manual therapy.
If this is your first time coming in, take a look at our guide to your first visit so you know exactly what to bring and what the intake process looks like.
Benefits of Phonophoresis in Physical Therapy
- Needle-free medication delivery for patients who want to avoid injections
- Targeted treatment that concentrates medication exactly where it’s needed
- Minimal side effects compared to oral anti-inflammatories, since less medication enters the bloodstream
- Pairs easily with other modalities like dry needling or chiropractic care for a more complete recovery plan
- Quick and comfortable, typically adding only a few minutes to a standard PT visit
Who Performs Phonophoresis?
Phonophoresis is administered by a licensed physical therapist trained in therapeutic ultrasound modalities. Because the technique involves both medication and specialized equipment, it should always be done under professional supervision rather than attempted with an over-the-counter ultrasound device at home. Your physical therapist will also monitor how your skin and tissue respond over multiple sessions and adjust the treatment plan accordingly.
Phonophoresis in Chicago: Skokie, the Loop & West Loop
At Chicago Chiropractic & Sports Injury Centers, phonophoresis is available as part of a comprehensive physical therapy plan across our Chicago-area locations. Whether you’re a marathoner nursing Achilles tendinitis or someone dealing with desk-job shoulder pain, our physical therapists can help determine whether phonophoresis fits into your recovery.
Skokie – Physical Therapy and Phonophoresis
Chicago Loop – Downtown Physical Therapy
West Loop – Physical Therapy Clinic
Ready to find relief?
Our physical therapists can evaluate your injury and let you know whether phonophoresis, ultrasound therapy, or another approach is the right fit for your recovery.
Frequently Asked Questions About Phonophoresis
How many phonophoresis sessions will I need?
It varies by condition, but most Chicago patients see phonophoresis included in 6 to 12 physical therapy visits, often scheduled two to three times per week alongside exercise and manual therapy.
Is phonophoresis covered by insurance in Illinois?
Phonophoresis is typically billed as part of a physical therapy visit, and coverage depends on your specific plan. Our front desk team can help verify your insurance benefits before your first appointment.
Can phonophoresis be combined with chiropractic care?
Yes. Many patients at our Skokie, Loop, and West Loop locations combine phonophoresis with chiropractic care, dry needling, or massage therapy as part of one coordinated treatment plan.
How soon will I feel results from phonophoresis?
Some patients notice reduced inflammation and pain within a few sessions, while others need several weeks of consistent treatment. Results depend on the severity of the injury and how well you follow your home exercise plan between visits.
Who is not a good candidate for phonophoresis?
Phonophoresis generally isn't recommended for patients who are pregnant, have certain skin conditions, sensitivity to the medication used, or implanted electronic devices near the treatment area. Your physical therapist will screen for these factors before starting treatment.
Curious about the science behind ultrasound-based treatments? Read more in our post on the benefits of phonophoresis or learn how ultrasound is used in physical therapy more broadly. You can also browse our full list of answers on the physical therapy FAQ page.
Chicago Chiropractic & Sports Injury Centers — serving Skokie, the Loop, and West Loop. This article is for informational purposes and is not a substitute for a personalized evaluation from a licensed physical therapist.
