Shockwave Therapy Explained: A Complete Patient Guide

Table of Contents

What Is Shockwave Therapy?
The History of Shockwave Technology
The Acoustic Wave Mechanism: How Shockwave Heals
Types of Shockwave Devices
Clinical Evidence: What the Research Shows
Conditions Treated with Shockwave Therapy
Who Is a Good Candidate?
Who Should Not Receive Shockwave Therapy?
What a Shockwave Session Feels Like
How Many Sessions Are Needed?
The Combination Approach at McNamara Chiropractic Center
Shockwave vs. Other Therapies
Frequently Asked Questions

What Is Shockwave Therapy?

Shockwave therapy — formally called Extracorporeal Shockwave Therapy (ESWT) — is a non-invasive medical treatment that uses high-energy acoustic pressure waves to stimulate healing in damaged musculoskeletal tissue. "Extracorporeal" means the waves originate outside the body and are transmitted through the skin — no incisions, no needles, no injections.

The term "shockwave" can sound alarming. It is not painful in the way the name might suggest, and it has nothing to do with electrical shock. The waves are acoustic — sound waves — similar in type (but very different in energy and clinical application) to diagnostic ultrasound. The "shock" refers to the rapid pressure rise characteristic of the waves, not to electrical current.

Shockwave therapy has been used in medicine for decades, beginning with kidney stone treatment (lithotripsy) and expanding into musculoskeletal medicine as researchers discovered powerful regenerative effects in soft tissue. Today, ESWT is a well-established treatment for a range of chronic tendinopathies and musculoskeletal conditions, supported by substantial clinical evidence.

The History of Shockwave Technology

The story of shockwave therapy begins in the 1960s when researchers at Dornier (a German aerospace company) accidentally discovered that high-energy acoustic waves could pulverize dense materials. By the 1980s, this technology was refined for lithotripsy — breaking kidney and gallstones non-invasively — and Dornier's Lithotripter became a landmark medical device.

During clinical kidney stone treatments, researchers noticed that the acoustic waves stimulated bone healing in adjacent tissue. This observation led to the investigation of lower-energy shockwaves for musculoskeletal applications. By the early 1990s, ESWT was being studied for orthopedic conditions including calcific shoulder tendinitis and plantar fasciitis.

In 2000, the FDA cleared ESWT for plantar fasciitis in the United States. Additional clearances followed for calcific shoulder tendinitis. Thousands of clinical studies have since been published on ESWT for a wide range of conditions, establishing it as a genuine evidence-based treatment rather than experimental therapy.

The Acoustic Wave Mechanism: How Shockwave Heals

Understanding why shockwave therapy works requires understanding what happens at the cellular level when acoustic pressure waves penetrate tissue.

Physical Properties of Shockwaves

A shockwave is characterized by:

Rapid pressure rise: The pressure at the focal point rises from ambient to peak (typically 10–100 MPa) in nanoseconds
Short duration: The positive pressure phase lasts only microseconds
Tensile component: Following the positive pressure phase, a tensile (negative pressure) phase occurs — this cavitation component is particularly important for calcification breakdown

These properties distinguish shockwaves from ultrasound, which uses continuous low-amplitude oscillations rather than single high-amplitude pulses.

Cellular and Tissue Mechanisms

Mechanotransduction: When shockwaves contact tissue, the mechanical energy is converted into biological signals through a process called mechanotransduction. Cells sense the pressure wave and respond by activating growth factor production and cellular repair mechanisms.

Angiogenesis (new blood vessel formation): ESWT stimulates production of Vascular Endothelial Growth Factor (VEGF), a key signal for new blood vessel growth. This is particularly important for tendons and fascia — tissues with poor innate blood supply. In chronic tendinopathy, the tendon's limited vascularity is one reason it heals poorly. Shockwave-stimulated angiogenesis restores the blood supply needed for genuine repair.

Growth Factor Release: Shockwaves trigger release of multiple growth factors including:

TGF-β1 (Transforming Growth Factor Beta 1) — stimulates fibroblast proliferation and collagen synthesis
IGF-1 (Insulin-like Growth Factor 1) — promotes tissue repair and cell growth
BMP (Bone Morphogenetic Proteins) — supports bone and tendon healing

Collagen Synthesis: The combination of mechanical stimulation and growth factor release drives fibroblasts to produce new collagen. In degenerated tendons, the disorganized, degraded collagen matrix is gradually replaced with properly organized Type I collagen — restoring structural integrity.

Calcification Breakdown: The tensile (cavitation) component of shockwave creates rapidly forming and collapsing micro-bubbles within calcific deposits. The energy of bubble collapse mechanically disrupts calcium crystals, breaking them into particles small enough for macrophages to phagocytose and remove.

Pain Modulation: ESWT modulates pain through several mechanisms:

Substance P reduction: Substance P is a neuropeptide that transmits pain signals. ESWT reduces Substance P levels at the treatment site, directly reducing pain sensitization
Gate control: The mechanical stimulation of shockwaves activates mechanoreceptors, which compete with nociceptive signals at the spinal cord level (gate control theory)
Hyperstimulation analgesia: High-energy shockwaves can temporarily numb pain receptors — a phenomenon called hyperstimulation analgesia — providing immediate post-treatment pain relief

Types of Shockwave Devices

Two primary types of shockwave devices are used clinically:

Focused Shockwave (Electrohydraulic, Electromagnetic, Piezoelectric)

Focused shockwave devices generate high-energy waves that converge at a specific focal point beneath the surface. The energy is highest at the focus and drops off rapidly around it. Focused ESWT delivers more energy to a specific depth — ideal for calcific deposits and deep tendon pathology.

The three generation methods (electrohydraulic, electromagnetic, piezoelectric) each produce slightly different wave characteristics but share the focused delivery principle.

Radial Pressure Wave (Pneumatic)

Radial devices generate pressure waves from a pneumatic piston that sends waves radially outward from the applicator tip — not to a deep focal point, but dispersing energy through a broader surface area. Often called "radial shockwave" or "ballistic shockwave." Effective for superficial conditions, trigger points, and broad-area treatment like plantar fasciitis and IT band syndrome.

At McNamara Chiropractic Center, shockwave is delivered using equipment appropriate to the conditions being treated.

Clinical Evidence: What the Research Shows

Shockwave therapy is one of the more thoroughly researched non-surgical treatments in musculoskeletal medicine. Here is a summary of the evidence for the most common clinical applications:

Plantar Fasciitis

Plantar fasciitis is the condition with the strongest evidence base for ESWT. Multiple randomized controlled trials and meta-analyses support ESWT as effective for chronic plantar fasciitis — particularly cases that have failed stretching, orthotics, corticosteroid injection, and physical therapy.

A 2012 Cochrane systematic review of 9 RCTs found that ESWT is more effective than placebo for plantar fasciitis at reducing pain and improving function. Several individual RCTs demonstrate benefit at 3-month and 12-month follow-up, suggesting the effects are durable.

Calcific Shoulder Tendinitis

ESWT has among its strongest evidence in calcific shoulder tendinitis. A landmark RCT by Gerdesmeyer et al. (2003) found focused ESWT superior to sham treatment for calcific deposits > 15mm. Subsequent studies confirm that high-energy focused ESWT produces both radiographic reduction in calcification size and clinically significant pain reduction and functional improvement.

Patellar Tendinopathy (Jumper's Knee)

ESWT is considered a first-line treatment for patellar tendinopathy that has failed eccentric exercise therapy. A meta-analysis published in the British Journal of Sports Medicine found ESWT superior to sham and comparable to or better than PRP injection for patellar tendinopathy. The effect appears related to the angiogenic and collagen-stimulating mechanisms.

Achilles Tendinopathy

Evidence for ESWT in midportion Achilles tendinopathy is positive, with several RCTs demonstrating benefit over conservative care alone. For insertional Achilles tendinopathy — which responds poorly to eccentric exercise — ESWT is one of few conservative options with clinical evidence.

Lateral Epicondylitis (Tennis Elbow)

ESWT for lateral epicondylitis has a substantial evidence base, though some trials show heterogeneous results depending on energy level and device type. Overall, the evidence supports ESWT as an effective option for chronic tennis elbow resistant to conventional treatment.

Other Conditions

Emerging evidence supports ESWT for:

Rotator cuff tendinopathy (non-calcific)
Greater trochanteric pain syndrome (hip tendinopathy)
Trigger point therapy (radial ESWT)
Stress fractures (bone healing acceleration)
Avascular necrosis

Conditions Treated with Shockwave Therapy

At McNamara Chiropractic Center, shockwave therapy is used for:

Foot and Ankle:

Plantar fasciitis (chronic heel pain)
Achilles tendinopathy (mid-portion and insertional)
Posterior tibial tendinopathy

Knee:

Patellar tendinopathy (jumper's knee)
IT band syndrome (lateral knee)
Pes anserine bursitis

Hip:

Greater trochanteric pain syndrome (hip tendinopathy)
Hamstring tendinopathy
Hip flexor tendinopathy

Shoulder:

Calcific shoulder tendinitis
Rotator cuff tendinopathy (supraspinatus, infraspinatus)
Bicipital tendinopathy

Elbow:

Lateral epicondylitis (tennis elbow)
Medial epicondylitis (golfer's elbow)

Spine and Paraspinal:

Chronic paraspinal trigger points
Facet joint pain (indirect via surrounding soft tissue)

Other:

Myofascial trigger points (multiple areas)
Non-union bone fractures (emerging evidence)

Who Is a Good Candidate?

Shockwave therapy is most effective for:

Chronic conditions that have failed first-line treatment. ESWT is not typically a first-line therapy for acute conditions — the body's normal healing response often handles acute injuries without intervention. The ideal ESWT candidate has a condition lasting more than 3 months that has not responded adequately to rest, stretching, physical therapy, and/or corticosteroid injection.

Tendinopathies (not acute tendinitis). The distinction matters: acute tendinitis (acute inflammation of an otherwise healthy tendon) responds to rest and anti-inflammatory measures. Tendinopathy (chronic degeneration of the tendon tissue itself) does not — it requires a regenerative stimulus like ESWT.

Calcific deposits. Calcific shoulder tendinitis is one of the strongest indications.

Patients who want to avoid repeated cortisone injections. Corticosteroid injections provide temporary relief but may weaken tendon tissue with repeated use. ESWT provides lasting regenerative effects.

Active adults who want to stay active. For South Florida's golfers, pickleball players, and tennis players who cannot afford extended downtime, ESWT's relatively short recovery and quick return-to-activity is a significant advantage.

Who Should Not Receive Shockwave Therapy?

Absolute contraindications:

Blood clotting disorders or anticoagulant therapy
Open wounds or infection at the treatment site
Malignancy (cancer) at or near the treatment site
Pregnancy over the treatment area
Thrombosis

Relative contraindications (require individual evaluation):

Corticosteroid injection at the treatment site within the past 6 weeks (wait until inflammation from injection resolves)
Skeletally immature patients (growth plates not yet closed)
Nerve or vascular disease affecting the treatment area

What a Shockwave Session Feels Like

One of the most common questions from patients is: "Does shockwave hurt?"

The honest answer: it varies by condition, location, and device parameters — but it is generally manageable and very different from what the term "shockwave" might imply.

Preparation: A coupling gel (similar to ultrasound gel) is applied to the skin over the treatment area. The gel allows the pressure waves to transmit efficiently into tissue without energy loss at the skin surface.

During treatment: The therapist presses the applicator firmly against the skin and applies pressure waves in a systematic pattern over the treatment area.

At lower energy settings, most patients describe the sensation as similar to a firm tapping or knocking. At higher energy settings (appropriate for some calcific conditions), patients may feel more significant pressure — some describe it as uncomfortable but tolerable.

The area may feel tender because the treatment is targeting already-painful tissue. This is expected and appropriate — the sensitivity indicates the applicator is over the right tissue.

Duration: A typical session treats one or two areas. Each area takes 3–10 minutes. Total session time including assessment is usually 15–30 minutes.

After treatment: Mild soreness in the treated area for 24–48 hours is common and expected — it indicates the regenerative process has been activated. This is comparable to the soreness after a hard workout. Ice can be applied. Anti-inflammatory medications should generally be avoided in the 48 hours after ESWT as they may blunt the beneficial inflammatory response that initiates healing.

Most patients find subsequent sessions more comfortable as the tissue heals and sensitization decreases.

How Many Sessions Are Needed?

The standard ESWT protocol for most conditions is 3 to 6 sessions spaced approximately 5–7 days apart. This weekly spacing allows:

The inflammatory response from the previous session to complete
The regenerative cascade to progress between sessions
Accumulation of treatment effects over multiple sessions

Plantar fasciitis: Typically 3–5 sessions of radial ESWT, or 3 sessions of focused ESWT at higher energy.

Calcific shoulder tendinitis: 3–5 sessions of focused ESWT. Some calcifications require additional sessions.

Patellar tendinopathy: 3–5 sessions, combined with progressive loading program.

Achilles tendinopathy: 3–6 sessions, combined with eccentric heel drop program.

Tennis/golfer's elbow: 3–5 sessions.

Results are not always immediate. Many patients see the most significant improvement 4–12 weeks after completing the treatment course — as the angiogenic and collagen remodeling effects mature. This delayed response is characteristic of regenerative therapies and is a sign that the mechanism is working as intended.

The Combination Approach at McNamara Chiropractic Center

At McNamara Chiropractic Center, shockwave therapy is not offered in isolation. It is integrated into comprehensive treatment programs that address multiple aspects of complex conditions simultaneously.

The Knee Restoration Program:

Knee-on-Trac decompression — reduces intra-articular pressure
Class IV Laser — anti-inflammatory, cartilage support, nerve regeneration
Shockwave — addresses periarticular tendinopathy (patellar, IT band, pes anserine)

This combination treats both the joint itself (decompression + laser) and the surrounding soft tissue (shockwave), which are often both contributing to pain in knee OA patients.

The Spinal Decompression Program:

Antalgic-Trac decompression — reduces intradiscal pressure, promotes disc healing
Class IV Laser — reduces nerve root inflammation, supports disc repair
Shockwave — breaks down chronic paraspinal muscle tension and trigger points

The shockwave component in the spinal program specifically addresses the chronic paraspinal muscle dysfunction that:

Increases compressive disc load
Limits range of motion
Perpetuates pain through trigger points even after disc issues improve

Shoulder and Joint Program:

Shockwave is the primary modality for tendinopathy
Laser provides complementary anti-inflammatory and tissue-healing effects
Chiropractic adjustment addresses joint alignment and mobility

Why combination is better than single modality: Each therapy addresses a different pathophysiological mechanism. A patient with knee OA has articular cartilage degeneration (addressed by decompression and laser), synovial inflammation (addressed by laser and decompression), periarticular tendinopathy (addressed by shockwave), and often muscle inhibition patterns (addressed by rehabilitation and shockwave trigger point work). Treating only one mechanism leaves others unaddressed — limiting outcomes.

Shockwave vs. Other Therapies

Therapy	Mechanism	Duration of Effect	Invasiveness
Corticosteroid Injection	Anti-inflammatory (acute)	Weeks–months	Minimally invasive (injection)
PRP Injection	Growth factor delivery	Months–years	Minimally invasive (injection)
Shockwave Therapy	Regenerative (angiogenesis, collagen)	Months–years	Non-invasive
Surgery	Structural repair/removal	Variable	Invasive
Physical Therapy Alone	Exercise-based	Variable	Non-invasive

The advantage of shockwave over corticosteroid injection is not speed of relief — corticosteroid often works faster. The advantage is durability and the absence of tissue-weakening effects. Repeated cortisone injections can weaken tendon collagen over time; ESWT strengthens it.

Compared to PRP, ESWT is equally non-invasive (no injections), generally less expensive, and has a broader evidence base for specific conditions like calcific tendinitis.

Frequently Asked Questions

Is shockwave therapy covered by insurance? Coverage varies significantly by plan. Medicare and most major insurance plans do not currently cover ESWT, viewing it as investigational despite the clinical evidence. Workers' compensation plans and some private plans may cover it. Our office can verify your benefits.

How soon can I return to activity after shockwave? Most patients return to normal activities immediately. High-impact activities targeting the treated area should be modified for 48–72 hours post-treatment while the regenerative response is active.

Can shockwave be combined with other treatments I am already receiving? Generally yes. Shockwave can be combined with chiropractic adjustment, physical therapy, and laser therapy. It should not be applied within 6 weeks of a corticosteroid injection at the same site.

Is shockwave the same as TENS or ultrasound? No. TENS (electrical stimulation) and therapeutic ultrasound are fundamentally different technologies. ESWT operates at a different energy level and through a different mechanism than ultrasound, though both use acoustic waves.

What if shockwave doesn't work? The majority of patients with appropriate indications respond to ESWT within the course of treatment. Patients who do not respond may be candidates for PRP injection, surgical consultation, or further diagnostic workup to identify contributing factors.

Ready to find out if shockwave therapy can help you? Call (954) 943-1100 or visit us at 3320 N. Federal Highway, Suite 101, Lighthouse Point, FL 33064.

McNamara Chiropractic Center | Lighthouse Point, FL

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