Shockwave Therapy (ESWT): How It Works, Conditions Treated, and What the Evidence Shows

Shockwave therapy, also called extracorporeal shockwave therapy (ESWT), is a noninvasive treatment that sends acoustic pressure waves through the skin into injured tendon, fascia or bone to reduce pain and restart healing that has stalled. It is used mostly for chronic plantar fasciitis, tennis elbow and calcific tendinitis of the shoulder, usually as 3 to 5 weekly sessions after months of conservative care have failed, and the FDA approved the first focused ESWT device for chronic heel pain in 2000.

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If you’ve been battling a stubborn tendon injury that just won’t resolve, such as the nagging plantar fasciitis that makes your first steps out of bed feel like walking on broken glass, or a tennis elbow that’s been lingering for months despite rest, ice, and ibuprofen, shockwave therapy deserves a serious look. It’s one of the few regenerative treatments with a real body of randomized trials behind it, and for some conditions, such as calcific tendinitis of the shoulder, the data is genuinely encouraging.

The name “shockwave” sounds aggressive, but the therapy is actually quite elegant in its mechanism. Rather than masking pain or suppressing inflammation, shockwave therapy deliberately initiates a controlled micro-trauma at the cellular level, triggering your body’s own repair cascade in tissue that has essentially “stalled out” in a state of chronic, non-healing injury. Think of it as a biological restart signal, and the science behind how it works is fascinating.

What Is Shockwave Therapy?

Shockwave therapy is a noninvasive treatment that delivers short, high pressure acoustic pulses into soft tissue and bone to reduce chronic pain and stimulate repair. Clinicians call it extracorporeal shockwave therapy, or ESWT, because the waves are generated outside the body (extracorporeal) and travel through the skin. Other names you will see include shock wave therapy, acoustic wave therapy, radial pressure wave therapy (RPW), focused shockwave (f-ESWT), radial shockwave (r-ESWT) and low intensity shockwave therapy (Li-ESWT) when it is used for erectile dysfunction.

The technology grew out of lithotripsy, the urology procedure that uses focused shockwaves to break up kidney stones. Orthopedic researchers later noticed that the same energy, at lower doses, affected bone and tendon. Today shockwave therapy sits alongside platelet-rich plasma (PRP), prolotherapy and low level laser therapy in the group of tissue regeneration therapies offered for stubborn musculoskeletal pain.

The clinicians who deliver shockwave therapy include sports medicine physicians, orthopedic surgeons, podiatrists, physiatrists (physical medicine and rehabilitation doctors), physical therapists and chiropractors, and urologists for Li-ESWT. Our shockwave therapy treatment guide covers the device types, indications and questions to ask in more depth.

How Shockwave Therapy Works: The Mechanisms

Shockwave therapy delivers acoustic pressure waves, pulses of mechanical energy, through the skin and into the underlying tissue. These aren’t electrical shocks (a common misconception). They’re sound waves, similar in principle to the ultrasound waves used in imaging but at much higher energy levels and in short, high-amplitude pulses. When these waves hit tissue, several things happen at the cellular and molecular level:

Focused vs. Radial Shockwave: Which Type Is Better?

This distinction matters more than most patients realize, and not all clinics offer both types:

Focused shockwave (f-ESWT): Generates a true shockwave using electromagnetic, electrohydraulic, or piezoelectric technology. The energy converges to a precise focal point deep in the tissue (up to 12 cm depth). It delivers higher energy levels, is more targeted, and is the type used in the majority of clinical research. It is best suited to deep structures, calcifications, and non-unions. The equipment is more expensive and is typically found in specialized orthopedic or sports medicine clinics.

Radial shockwave (r-ESWT or radial pressure wave therapy): A projectile strikes an applicator tip, generating a pressure wave that spreads radially from the surface. The energy dissipates as it penetrates, so it’s most effective in the first 3-4 cm of tissue. It delivers lower energy per pulse but covers a broader treatment area. It is more widely available, less expensive, and used for superficial tendon conditions. Technically, purists argue these are “pressure waves” rather than true “shockwaves,” but the clinical outcomes for many conditions are comparable.

For most common musculoskeletal conditions (plantar fasciitis, tennis elbow, Achilles tendinopathy), both types are used and head-to-head trials have not shown a clear winner. Focused shockwave has an advantage for deeper structures and calcific conditions, while radial is often sufficient for superficial tendon pathology and may be more comfortable during treatment.

Three Core Mechanisms of Action

What Conditions Does Shockwave Therapy Treat?

Shockwave therapy treats chronic tendon, fascia and bone conditions that have not improved after at least 3 to 6 months of rest, stretching, orthotics, bracing or physical therapy. The best studied are chronic plantar fasciitis, lateral epicondylitis (tennis elbow) and calcific tendinitis of the rotator cuff. Clinicians also use it for Achilles tendinopathy, patellar tendinopathy (jumper’s knee), greater trochanteric pain syndrome at the hip, and fractures that have failed to heal.

Newer uses include knee osteoarthritis, erectile dysfunction and cellulite. The evidence for these is thinner, and most of these uses are off label and cash pay in the US. The table below summarizes how strong the evidence is for each, using the sources discussed in the next section.

What the Evidence Shows: Condition by Condition

Plantar Fasciitis: FDA Approved Indication, Mixed Trial Results

Plantar fasciitis is shockwave therapy’s best known indication and the one the FDA first approved. According to the FDA premarket approval record (2000), the first focused ESWT device was approved for chronic proximal plantar fasciitis that had persisted for 6 months or more and failed conservative treatment (stretching, orthotics, physical therapy). Several randomized trials and systematic reviews report greater pain reduction with ESWT than with sham treatment, and clinic and case series reports describe success rates of 60-80% in chronic cases.

The trial record is not uniform. A German multicentre trial of 272 patients published in the BMJ by Haake and colleagues (2003) found a 12 week success rate of 34% with ESWT and 30% with placebo, a difference that was not significant. Reviewing the evidence, NICE (2009) found no major safety concerns but called the efficacy evidence inconsistent, and advised that ESWT for refractory plantar fasciitis be used only with special arrangements for consent and audit or research. Most protocols deliver 2,000-3,000 pulses per session over 3-5 weekly sessions. Our deep dive on shockwave therapy for plantar fasciitis covers protocols and alternatives in more detail.

Tennis Elbow (Lateral Epicondylitis): Mixed Evidence

ESWT for chronic lateral epicondylitis (tennis elbow) is an FDA approved device indication for cases that have failed 6+ months of conservative treatment, and several RCTs have shown improvements in pain and grip strength compared to placebo. Success rates of 65-75% have been reported in some chronic case series, with improvements continuing for up to 12 months post-treatment. Pooled data are less encouraging: a 2021 meta-analysis in Clinical Rehabilitation of 27 randomized trials and 1,871 patients found some statistical improvement in pain and grip strength, but concluded with low to moderate certainty that ESWT offered no clinically meaningful benefit over sham treatment or corticosteroid injections. ESWT remains a reasonable option to discuss when cortisone is being avoided, since repeated cortisone shots raise concerns about weakening tendon tissue.

Calcific Tendinitis of the Shoulder: Supported by Randomized Trials

The clearest results are seen in calcific tendinitis, calcium deposits within the rotator cuff tendons that cause severe pain and restricted movement. Focused high-energy ESWT can fragment these calcifications and help the body resorb them, with complete resorption rates of 50-85% reported across studies. In a double blind trial of 144 patients published in JAMA by Gerdesmeyer and colleagues (2003), both high-energy and low-energy ESWT improved shoulder function scores and reduced deposit size compared with sham treatment, with the larger effect at high energy. For many patients, this means surgical removal of the calcium deposits can be avoided or postponed. Shoulder protocols are covered in our article on shockwave therapy for the shoulder.

Knee Osteoarthritis: Promising

Emerging evidence suggests that ESWT may reduce pain and improve function in knee osteoarthritis by stimulating cartilage repair processes and reducing inflammatory mediators in the joint environment. Several RCTs have shown improvements in pain scores and walking capacity. A 2020 meta-analysis found moderate evidence supporting ESWT as an adjunct therapy for knee OA. Larger, longer-term studies are needed before this can be considered established. The mechanism here likely involves both anti-inflammatory effects and stimulation of subchondral bone remodeling. For other options, see our osteoarthritis treatment overview.

Erectile Dysfunction: Investigational (Li-ESWT)

Low-intensity ESWT (Li-ESWT) for erectile dysfunction has generated significant clinical interest. The proposed mechanism is neovascularization, creating new blood vessels in the penile tissue to improve blood flow, which is the fundamental issue in vasculogenic ED. Several randomized trials have shown improvements in erectile function scores, with some men able to achieve satisfactory erections without PDE5 inhibitors (sildenafil, tadalafil) after treatment. A meta-analysis by Clavijo and colleagues in the Journal of Sexual Medicine (2017) pooled 7 randomized trials with 602 men and found statistically significant improvements in IIEF erectile function scores compared with sham. The treatment involves 6-12 sessions of low-energy focused shockwaves applied to the penile shaft and crura.

The optimal protocol (energy level, number of sessions, treatment points) is still being refined, long-term durability data is limited, and the American Urological Association’s 2018 erectile dysfunction guideline classifies Li-ESWT as investigational. In the US it is an off label, cash pay service. Our article on shockwave therapy for ED and the ED treatment guide compare it with medication and other options.

Cellulite Reduction: Early Research

Acoustic wave therapy for cellulite is based on the premise that radial shockwaves can disrupt fibrous septae (the connective tissue bands that create the dimpled appearance), improve local blood flow, and stimulate collagen remodeling. Some clinical studies have reported visible improvements in cellulite appearance, but the evidence base is still small, results are inconsistent, and high-quality controlled trials are limited. Consider this an area of active investigation rather than an evidence-based recommendation at this point.

Shockwave vs. Other Treatments: How They Compare

Shockwave therapy is one of four common options for chronic tendon pain, alongside PRP injections, cortisone injections and physical therapy. The table compares them on mechanism, number of treatments, recovery time, cost and evidence strength.

Treatment	Mechanism	Number of Treatments	Recovery Time	Cost per Course	Evidence Strength
Shockwave Therapy (ESWT)	Mechanotransduction, neovascularization, pain modulation	3-5 sessions	Minimal (may have 24-48h soreness)	$600-$2,500	Strongest for calcific tendinitis; mixed for plantar fasciitis and tennis elbow
PRP (Platelet-Rich Plasma)	Concentrated growth factors from your own blood	1-3 injections	1-2 weeks limited activity	$500-$2,000	Moderate (variable quality)
Cortisone Injection	Anti-inflammatory (suppresses, doesn’t heal)	1-3 injections (limit 3-4/year)	Minimal	$100-$400	Strong short-term; concerns about long-term tissue weakening
Physical Therapy	Exercise, manual therapy, progressive loading	12-24+ sessions over months	Ongoing (part of treatment)	$1,200-$4,800	Strong (gold standard first-line)

Shockwave Therapy in Rehabilitation

Shockwave therapy works best as one part of a rehabilitation plan rather than a standalone fix. Physical therapists and sports medicine physicians typically pair ESWT with progressive tendon loading, such as eccentric heel drops for Achilles tendinopathy, wrist extensor loading for tennis elbow, and calf and plantar fascia stretching for heel pain. The shockwave sessions aim to reduce pain enough that the patient can load the tendon, and the loading program does the long term remodeling.

A typical rehabilitation sequence looks like this:

1. A clinician confirms the diagnosis with an exam and, where needed, ultrasound, X-ray or MRI, and rules out problems shockwave cannot address, such as a full thickness tendon tear or nerve entrapment.
2. The patient completes 3-5 weekly shockwave sessions while continuing a home exercise program prescribed by a physical therapist.
3. Load is increased gradually over the following 6-12 weeks as pain allows, with high impact activity limited for a few days after each session.
4. Results are reassessed at around 12 weeks, when most protocols judge whether the course worked.

If heel pain is the problem, our guides to plantar fasciitis exercises and plantar fasciitis treatment options show the loading work that usually runs alongside shockwave.

What to Expect During Treatment

Shockwave therapy is not a spa experience. The treatment involves applying acoustic pulses to an area that’s already painful, and most patients describe the sensation as moderately uncomfortable, somewhere between a firm tapping and a snapping rubber band against the skin. Pain tolerance varies, and practitioners can adjust the energy level. Most people tolerate it well, and the discomfort diminishes as the area becomes somewhat desensitized during the session.

Before treatment: No special preparation is needed. You may be asked to avoid anti-inflammatory medications (NSAIDs like ibuprofen) for 2-3 days before and after treatment, as the inflammatory response is actually part of the healing mechanism you’re trying to trigger. Ice should also be avoided post-treatment for the same reason.

During the session: The practitioner applies ultrasound gel to the treatment area and positions the shockwave applicator. You’ll feel the pulses being delivered, typically 2,000-3,000 pulses over 5-10 minutes per treatment zone. The practitioner may ask you to identify the most tender spots, as these are often the most important areas to treat. The entire session (including setup) usually takes 15-20 minutes.

After treatment: Some soreness, redness, and mild swelling in the treatment area is normal and expected for 24-48 hours, and is part of the healing response. Most people can return to normal activities immediately, though high-impact activities on the treated area should be limited for a few days. Improvements in pain and function are typically progressive over 4-12 weeks as the biological remodeling process unfolds.

How many shockwave therapy sessions will I need?

Most musculoskeletal protocols use 3-5 sessions spaced about 1 week apart, and calcific tendinitis protocols sometimes use fewer, higher energy sessions. Li-ESWT protocols for erectile dysfunction are longer, typically 6-12 sessions. The exact count depends on the condition, the device type and the clinician’s protocol, so ask for the planned number of sessions and the total course price before starting.

Side Effects and Risks of Shockwave Therapy

The most common side effects of shockwave therapy are pain during the session, redness, swelling, small skin bruises (petechiae) and soreness that lasts 24-48 hours. Reviewing the plantar fasciitis trials, NICE (2009) reported no major safety concerns, with treatment pain and skin redness as the main reported adverse events. Less common risks include temporary numbness or tingling near the treated area and, rarely, tendon or fascia rupture, which is one reason the FDA required post-approval follow-up of the first device.

Risk rises when shockwave is applied over the contraindicated areas listed above, in people on anticoagulants, or by an operator who has not confirmed the diagnosis. A clinician who images unclear cases, adjusts energy to your tolerance and explains what to do if pain worsens after a session is doing the job properly.

Cost and Practical Considerations

Shockwave therapy sessions typically cost $200-$500 per session, with most treatment courses requiring 3-5 sessions. That puts the total cost of a treatment course at $600-$2,500. Focused shockwave tends to be more expensive than radial due to equipment costs.

Insurance coverage for ESWT is inconsistent. It’s sometimes covered for plantar fasciitis (the indication with an FDA approved device) and occasionally for other chronic tendinopathies with documented failed conservative treatment, while some commercial insurers classify ESWT as investigational for all musculoskeletal uses. Newer indications like ED are rarely covered by insurance. Verify with your specific plan before starting treatment, and ask the clinic whether a health savings account (HSA) or flexible spending account (FSA) can be used.

When choosing a provider, look for practitioners with specific training in shockwave therapy, ideally sports medicine physicians, orthopedists, podiatrists or physical therapists who have completed device-specific training courses. Ask about the type of device (focused vs. radial), the energy levels used, and the number of cases they’ve treated for your specific condition. Experience matters with shockwave therapy: proper targeting and energy dosing significantly affect outcomes.

To compare providers, you can browse shockwave therapy clinics across the US by state and city. Regenerated.com is free for patients, and listing order is not paid ranking. Featured slots are labeled and capped, and Verified means a clinic completed credential checks, not that it paid more; the guide to Featured, Verified and organic listings explains the difference. Inclusion in the directory is not an endorsement, so use the questions above with any clinic you contact.

Frequently Asked Questions

How long until I see results?

Most people who respond to shockwave therapy notice some pain relief within 1-2 weeks, with gradual improvement over 6-12 weeks as the tissue remodels. Results are usually judged at about 12 weeks after the last session. Some patients feel a change after one session, while others notice little until the third or fourth. Clinic case series report satisfactory outcomes in roughly 70-80% of well selected patients, but controlled trials show smaller and less consistent gains for plantar fasciitis and tennis elbow.

Does shockwave therapy hurt?

Yes, shockwave therapy is uncomfortable during the 5-10 minutes of treatment, and most patients rate it around 4-6 out of 10. The discomfort is worst at the start and usually eases as the session goes on. Practitioners can lower the energy or ramp it up gradually if it is too intense. Mild soreness for 24-48 hours afterward is common. No anesthesia is used, because your feedback about where it hurts helps the clinician aim the applicator at the injured tissue.

Why shouldn’t I take ibuprofen after treatment?

Ibuprofen and other NSAIDs are usually avoided because shockwave therapy relies partly on the inflammatory response it triggers. Inflammation is the first step in tissue repair: it brings blood flow, growth factors and repair cells to the area. NSAIDs such as ibuprofen and naproxen, and ice, dampen that response and may blunt the treatment. Acetaminophen is generally acceptable for pain because it works differently. Most practitioners ask patients to skip NSAIDs for 48-72 hours before and after each session.

Can shockwave therapy be combined with other treatments?

Yes, shockwave therapy is commonly combined with physical therapy, especially eccentric and progressive tendon loading exercises, and this pairing is the best supported combination. Some clinicians also add PRP injections, sometimes at the same visit, on the theory that shockwave prepares the tissue for PRP growth factors. Trials testing shockwave plus PRP are still small, so treat that combination as reasonable but not established. Ask the clinician how each part of a combined plan is expected to help and what it adds to the cost.

Is shockwave the same as ultrasound therapy?

No, shockwave therapy and therapeutic ultrasound are different treatments, even though both use acoustic energy. Therapeutic ultrasound delivers continuous, low energy sound waves that gently warm tissue. Shockwave therapy delivers short, high energy pressure pulses that mechanically stimulate cells, with energy levels many times higher than therapeutic ultrasound. The two also differ in evidence: shockwave has a larger body of randomized trials for tendinopathies, while the evidence for therapeutic ultrasound in tendon pain is generally weak.

What if shockwave therapy doesn’t work for me?

If a full course of 3-5 sessions has not brought meaningful improvement by about 12 weeks, the next step is to reassess the diagnosis and consider other options. Clinic reports suggest roughly 20-30% of patients do not respond adequately. Options include PRP or prolotherapy injections, an MRI or ultrasound to look more closely at the tissue, a revised loading program, or a surgical consultation once conservative and regenerative options are exhausted. A poor response sometimes means the original diagnosis was incomplete.

The Bottom Line

Shockwave therapy (ESWT) is a noninvasive, FDA approved device treatment for chronic plantar fasciitis and tennis elbow that has failed conservative care, and its strongest trial support is for calcific tendinitis of the shoulder. Its mechanism, triggering the body’s own repair response through controlled mechanical stimulation, is biologically plausible and backed by laboratory research. For plantar fasciitis and tennis elbow the trials are mixed, so it is best seen as a reasonable, low risk alternative to cortisone injections (which suppress but don’t heal) or surgery (which carries greater risk), not a sure fix.

The key is appropriate patient selection: shockwave is most often used for chronic conditions (3+ months) that have failed initial conservative treatment, in patients who are willing to commit to 3-5 sessions, keep up their rehabilitation exercises and allow 6-12 weeks for the full response to unfold. If that describes your situation, it is a reasonable option to discuss with a sports medicine physician, orthopedist, podiatrist or physical therapist, and you can compare shockwave providers near you in the directory.

Related Topics

Explore related therapies and conditions on Regenerated:

• Prolotherapy: Injection-based regenerative therapy for ligament and tendon injuries using dextrose solutions
• PRP (Platelet-Rich Plasma): Using concentrated growth factors from your own blood to support tissue repair
• Stem Cell Therapy: The frontier of regenerative medicine and what the evidence actually supports
• Joint Pain: A complete guide to understanding and treating chronic joint conditions through integrative approaches