Shockwave therapy gets mentioned a lot in physio clinics — sometimes as a solution to everything, sometimes dismissed entirely. The truth is more nuanced: it has genuinely strong evidence for a small number of conditions and almost none for others. Knowing which is which matters more than knowing what shockwave is.
But the mechanism is worth understanding first, because it explains why it works for some things and not others.
What shockwave actually is
Extracorporeal shockwave therapy (ESWT) delivers high-energy acoustic pressure waves into tissue through a handheld applicator. It has nothing to do with electric shock — the “shock” is a pressure wave, not a current.
There are two types used clinically:
- Focused ESWT — concentrates energy at a specific tissue depth. More precise, higher energy, typically used for deeper structures and calcific deposits.
- Radial ESWT — disperses pressure from the applicator surface outward. Lower peak energy, but effective for more superficial tissue and more commonly found in clinic settings.
The acoustic waves trigger several responses in the tissue: they stimulate new blood vessel growth (angiogenesis), drive collagen synthesis in tendons, and deplete substance P — a neuropeptide involved in pain signalling. The result is a biological environment that promotes tendon remodelling and reduces localised pain, without injecting anything or breaking the skin.
What it’s actually supported for
This is where it gets specific. A 2024 umbrella review synthesising 16 systematic reviews — covering over 15,000 patients across hundreds of primary studies — gives a clear breakdown by condition. The evidence varies more than most people realise.
Plantar fasciitis — strong evidence
This is where shockwave has its best evidence base, by a significant margin. Multiple large independent reviews agree: shockwave produces meaningful, durable pain reduction for plantar fasciitis — including at 3, 6, and 12 months. It’s the only intervention in one major meta-analysis of 236 studies that maintained significant pain reduction at medium and long-term follow-up when other treatments had faded.
Head-to-head against corticosteroid injections, shockwave outperforms them at both 3 and 6 months — and without the risks that come with injections (plantar fascia rupture, fat-pad atrophy). For plantar heel pain that hasn’t settled with stretching, footwear changes, and load management after 6–12 weeks, shockwave is a strong first recommendation.
Calcific rotator cuff tendinopathy — moderate evidence
Calcific shoulder tendinopathy — where calcium deposits form within the rotator cuff — responds reasonably well to shockwave. The mechanism makes sense: acoustic waves help fragment and disperse the calcium deposits while also promoting tissue remodelling around them.
One caveat: ultrasound-guided needling (barbotage) — where a needle directly breaks up the calcium under imaging — can produce faster early results. Shockwave is a good option for people who want a non-invasive approach, or where needling isn’t suitable. Either way, imaging confirmation of calcification matters — shockwave for the shoulder is only supported for the calcific subtype.
Non-calcific shoulder pain — not supported
This is an important one to be honest about. For general subacromial shoulder pain without calcification, the evidence does not support shockwave. The highest-quality Cochrane review on this found that while there’s technically a measurable difference versus sham, it doesn’t reach a clinically meaningful threshold. Exercise-based rehab is the right first-line treatment here, not shockwave. More on shoulder pain and what actually fixes it →
Insertional Achilles tendinopathy — reasonable adjunct
There’s a subtype distinction worth knowing here. Insertional Achilles tendinopathy — pain right at the point where the tendon meets the heel bone — responds to shockwave better than mid-portion Achilles pain does.
The reason is biomechanical. The standard treatment for Achilles tendinopathy is eccentric heel drops — slow, loaded stretching of the tendon. But for insertional disease, that movement compresses the enthesis against the calcaneus and often makes it worse. Shockwave provides a way to stimulate tendon remodelling without that compressive load, making it a useful adjunct when the exercise program has to be modified. For mid-portion Achilles pain, progressive loading remains first-line and shockwave adds less.
Tennis elbow (lateral epicondylitis) — works as part of a combined approach
Shockwave produces benefit for tennis elbow, but the evidence supports it as one component of a combined treatment program rather than as a standalone treatment. Alongside eccentric wrist extensor loading, manual therapy, and activity modification, it’s a reasonable addition for persistent cases. On its own the evidence is thinner.
Patellar tendinopathy — weak evidence
Jumper’s knee is where shockwave’s evidence is weakest. A rigorous network meta-analysis found shockwave combined with exercise was not superior to sham combined with exercise — meaning the exercise itself was driving the improvement. When loading programmes are properly implemented, adding shockwave doesn’t appear to produce meaningful additional benefit.
What a session feels like
The applicator is pressed firmly against the skin over the target area — which itself creates some pressure. When the shockwave fires, most people feel a deep percussion or thumping sensation, sometimes described as a dull impact. Over sensitive or acutely tender areas it can be uncomfortable. For most people, it’s tolerable and over in 10–15 minutes.
Immediately after, the treated area is often locally sore for 24–48 hours — similar to delayed-onset muscle soreness. This is a normal tissue response. High-impact activity on the treated area should be avoided for 24–48 hours after each session.
How many sessions and when to expect results
Most protocols run three to five sessions, spaced one week apart. Unlike corticosteroid injections — which reduce inflammation quickly but often transiently — shockwave works through tissue remodelling, which takes time. Full benefit typically manifests over 6–12 weeks after the course finishes. It’s not a treatment where you feel dramatically better after session one.
The safety profile is consistently good across the research: side effects are local, minor, and transient. No serious adverse events have been reported across trials covering thousands of patients. This favourable safety profile is part of why it’s worth considering for appropriate presentations — the risk is low, and for the right conditions, the benefit is meaningful.
When it’s worth considering
Shockwave is most appropriate when:
- The condition is on the supported list — plantar fasciitis, calcific shoulder, or insertional Achilles
- First-line conservative management (load management, stretching, appropriate exercise) has been tried for at least 6–12 weeks without adequate improvement
- You want an evidence-based alternative to corticosteroid injections
- You need to keep the area loading but with a non-compressive stimulus to drive remodelling
It’s not a substitute for proper load management and rehabilitation — it works best alongside them, not instead of them. The combination of shockwave to drive tissue remodelling plus a graduated exercise program to rebuild load capacity gets the best outcomes.