Shockwave Therapy: How It Works, What It Treats, and What to Expect
If you've been dealing with nagging tendon pain, Achilles pain that flares every time you run, a stubborn case of tennis elbow, plantar fasciitis that hurts worst with your first steps in the morning, and you've already tried rest, ice, and stretching without much change, shockwave therapy is worth understanding. It's not a miracle cure and it's not for every kind of pain, but for a specific set of chronic tendon conditions, it has real, independent research behind it.
Here's what it actually is, how it works, what it treats, and what a session looks like.
What Is Shockwave Therapy?
Extracorporeal shockwave therapy (ESWT) is a non-invasive treatment that uses acoustic pressure waves, delivered through a handheld device pressed against the skin, to stimulate healing in chronic, stubborn tendon tissue. “Extracorporeal” just means the energy source stays outside the body; nothing is injected and nothing is cut.
There are two broad categories of shockwave devices:
• Focused ESWT (fESWT): concentrates energy at a specific depth and target, allowing it to reach deeper structures like the proximal hamstring or gluteal tendons with more precision.
• Radial ESWT (rESWT): disperses energy across a broader, more superficial area.
Back9 uses a focused, electrohydraulic ESWT device. Electrohydraulic focused shockwave has the strongest independent evidence for delivering effective energy to depth, which matters because a lot of the tendons we're treating, especially proximal hamstring and gluteal tendons in larger-bodied or more muscular patients, sit well below the skin surface. A device that can't reach that depth can't do much for that tendon, regardless of how it's marketed.
How It Actually Works
The old explanation you'll still see floating around online is that shockwave “breaks up scar tissue” or “breaks up calcium deposits.” That's an oversimplification of a much more interesting biological process called mechanotransduction.
In plain terms: the mechanical pressure wave passing through the tendon tissue triggers a cascade of cellular signals. Research on the biological response to ESWT has found it stimulates the formation of new blood vessels in the area (angiogenesis), influences the local inflammatory and catabolic processes that clear out damaged matrix material, and encourages tendon cells to lay down new, more organized collagen during remodeling. In other words, it's less like sandblasting scar tissue away and more like giving the tendon a targeted biological nudge to restart a stalled healing process.
That's also why shockwave isn't a passive, sit-back-and-let-the-machine-fix-it treatment. The best outcomes in the research come from ESWT combined with a progressive loading and exercise program, not shockwave alone. The shockwave stimulates the biology; the loading program is what actually rebuilds the tendon's capacity.
What Conditions Shockwave Treats
Shockwave has the strongest, most consistent evidence for chronic tendinopathies, tendon pain and dysfunction that's stuck around for weeks or months and hasn't responded to basic conservative care. At Back9, that includes:
• Achilles tendinopathy (mid-portion) — chronic Achilles pain, often worse with running or push-off
• Patellar tendinopathy (“jumper's knee”) — pain at the bottom of the kneecap, common in running and jumping sports
• Lateral epicondylitis (tennis elbow) — chronic outer elbow pain from repetitive gripping or backhand-style loading
• Plantar fasciitis — heel and arch pain, classically worst with the first steps in the morning
• Rotator cuff tendinopathy, including calcific tendinopathy — chronic shoulder pain, sometimes with a calcium deposit visible on imaging
• Proximal hamstring tendinopathy — deep, sitting-bone pain that flares with sprinting, lunging, or prolonged sitting
• Gluteal tendinopathy — outer hip pain, often mistaken for “hip bursitis”
A note on scope: our shockwave program is built around tendon conditions with strong, independent evidence behind them. We don't market shockwave for things like meniscal injuries, where the evidence for shockwave's effectiveness isn't there yet. If a condition falls outside what the research actually supports, we'll tell you that directly and point you toward what does have evidence behind it.
What to Expect During a Session
• Sessions are short. Actual treatment time is typically 5 to 10 minutes for the area being targeted.
• No anesthesia or numbing is needed. You'll feel a dull, pulsing pressure, and for some people, a brief ache, during treatment. Most describe it as uncomfortable but tolerable, not sharp or unbearable.
• There's no downtime. You can drive yourself home and go about your day.
• It's normal to feel a bit sorer for 24 to 48 hours afterward, similar to post-workout soreness. That usually settles on its own.
• Treatment is typically spaced about a week apart, for a series of sessions, rather than done once and finished.
• Shockwave is almost always paired with a loading-based exercise program specific to your tendon and your activity, whether that's running, golf, or general daily function.
How Many Sessions Will You Need?
This varies by condition, how long you've had symptoms, and how your tendon responds, but most protocols run somewhere in the range of 3 to 6 sessions, roughly a week apart, with a checkpoint reassessment along the way. Chronic, longer-standing tendinopathy generally needs the fuller course; more recent-onset cases sometimes respond faster. You won't be locked into a fixed package before we've actually seen how your tendon is responding.
Who Shockwave Isn't For
Shockwave is very safe, but it's not appropriate for everyone or every area. It's generally avoided in these situations:
• Pregnancy
• Blood clotting disorders or certain anticoagulant medications (this is evaluated case by case)
• Active infection or an open wound at the treatment site
• A known tumor in the area being treated
• Over open growth plates in children and adolescents
• Directly over major nerves, blood vessels, or the lungs
• Directly over a pacemaker or similar implanted device
We screen for all of this before starting, so if you're not sure whether you're a candidate, that's exactly the kind of question to bring to an evaluation.
Frequently Asked Questions
Does shockwave therapy hurt?
It's uncomfortable for some people, especially over a very irritated tendon, but it's not a treatment that requires numbing or sedation. Most patients tolerate it well, and the intensity is adjusted based on your feedback during the session.
How soon will I notice results?
Some people notice a change in pain within the first couple of sessions, but the more reliable pattern is gradual improvement over the full course of treatment, typically over several weeks, as the tendon actually remodels rather than just feeling temporarily better.
Is shockwave the same as ultrasound therapy or TENS?
No. Therapeutic ultrasound and TENS work through different mechanisms and generally have weaker evidence for structural tendon change. Shockwave delivers a much higher-energy mechanical pulse specifically intended to stimulate a biological remodeling response in chronic tendon tissue.
What's the difference between focused and radial shockwave, and which do you use?
Focused shockwave concentrates energy at a specific depth, which matters for reaching deeper tendons like the hamstring or glutes. Radial shockwave spreads energy more broadly but doesn't penetrate as deep. Back9 uses focused, electrohydraulic shockwave technology, chosen specifically for its evidence and its ability to reach depth-sensitive tendons accurately.
Can I keep training, running, or playing golf during treatment?
Usually yes, in a modified form. We'll adjust your activity and loading program around the treatment schedule rather than telling you to stop everything. Complete rest isn't typically what the tendon needs.
Does insurance cover shockwave therapy?
Back9 is a cash-based, direct-access practice, so shockwave is billed directly rather than through insurance. We can talk through cost and what a full course looks like before you commit to anything.
How is this different from a cortisone injection?
Cortisone can reduce pain and inflammation short-term, but it doesn't rebuild tendon tissue, and repeated injections have been linked to tendon weakening over time. Shockwave is aimed at stimulating an actual remodeling response in the tendon rather than just quieting symptoms.
Is shockwave therapy safe?
Yes. It's a well-studied, non-invasive treatment with a strong safety record for the tendon conditions it's used for. Like any treatment, it has specific situations where it isn't appropriate, which is why a proper evaluation comes first.
Ready to Find Out If Shockwave Is Right for You?
Chronic tendon pain doesn't usually resolve on its own just because you've been patient with it. If you've been dealing with Achilles, patellar, elbow, shoulder, hip, or heel pain for weeks or months, an evaluation is the fastest way to find out whether shockwave, a loading program, or something else entirely is the right next step.
