Tennis elbow, Achilles, patellar tendon, plantar fascia — chronic tendinopathy is a tissue problem, not just an inflammation problem. Here's how LAOSS specialists choose between extracorporeal shockwave therapy and a cortisone shot when conservative care has stalled past three months.
Cortisone calms the alarm. Shockwave rebuilds the tendon.
Chronic tendinopathy — tennis elbow, Achilles, patellar tendon, plantar fascia — is one of the most frustrating diagnoses in orthopedics. It hurts like an inflammatory problem but, after the first few weeks, it isn't really inflammation anymore. It's a degenerative tissue change: disorganized collagen, poor blood supply, and a tendon that has lost the ability to repair itself between bouts of load.
Cortisone (corticosteroid) injection delivers a potent anti-inflammatory steroid that suppresses the pain signal at the tendon. Relief is fast — often within 48 hours — and that can be lifesaving when pain has collapsed your ability to work, sleep, or function. The problem is that cortisone does not heal the underlying tendon. Worse, repeated steroid exposure in or near a tendon is associated with tissue weakening and, in the Achilles and patellar tendons, frank rupture.
Extracorporeal shockwave therapy (ESWT) is a non-invasive in-office treatment that delivers focused or radial acoustic pulses into the tendon over 10–20 minutes. The pulses are thought to stimulate angiogenesis (new blood vessel growth), recruit healing cells, and trigger collagen remodeling. There's no needle, no anesthesia, no medication. You feel sore for a day or two and gradually improve over the following 6–12 weeks.
At LAOSS we use both. The question we answer at every chronic tendinopathy visit isn't "shockwave or cortisone" in the abstract — it's which one fits your tendon, your timeline, your budget, and how many steroid shots you've already had.
Tendinopathy isn't a simple inflammation problem after the first few weeks — it's a tissue problem. This short video walks through how modern non-surgical care targets the underlying tendon.
Animations licensed from ViewMedica · Swarm Interactive
In a healthy tendon, parallel collagen fibers transmit load like a tightly wound rope. In chronic tendinopathy — lateral epicondylitis, Achilles, patellar, or plantar fascia — the collagen becomes disorganized, neurovascular ingrowth proliferates, and the tendon loses both strength and the ability to remodel itself between training sessions. Cortisone doesn't fix any of that; it suppresses the inflammatory signal in the surrounding tissue, which can give you weeks of relief but leaves the tendon structurally unchanged (or weaker, with repeat exposure). Shockwave delivers acoustic energy directly into the degenerative tissue, disrupting the abnormal neurovascular ingrowth and triggering the local healing response that the tendon had stopped mounting on its own.
There's no universal answer — but the decision usually breaks down along four axes: which tendon, how long, how many steroid shots, and what comes next.
Which tendon. The Achilles and patellar tendons are load-bearing tendons that can rupture catastrophically. We almost never inject cortisone directly into the body of these tendons; the literature on steroid-induced tendon rupture is too consistent to ignore. For lateral epicondylitis and plantar fascia, cortisone is more defensible short-term — but ESWT is the better long-term call past 3 months.
How long. Acute tendinopathy in the first 4–6 weeks often responds to rest, eccentric loading, and time alone. The conversation about ESWT vs cortisone really starts at the 3-month mark, when conservative care has plateaued. By 6 months, the tendon is squarely in the chronic, degenerative phase — and that's where ESWT has its strongest evidence.
How many steroid shots. If you've already had two or three cortisone injections in the past year without lasting relief, more steroid is unlikely to help and increasingly likely to harm. That's the moment to stop and switch to ESWT.
What comes next. If you're an athlete or laborer who needs the tendon to remodel and tolerate load again, ESWT is the strategic move. If you're trying to get to a planned vacation, surgery, or major life event with a few months of pain relief, cortisone is the right short-term tool — used once, with a real plan for what follows.
Most patients don't have to pick one and never touch the other. Here's how we sequence them based on which path fits your tendon and your situation.
When pain is acute, function is collapsing, or cost is a hard constraint — cortisone moves first. One shot, with a real plan for what follows.
When tissue healing matters more than fast symptom suppression — ESWT moves first. The default for athletes, laborers, and anyone past 3 months.
Cost is often the deciding factor — and unlike a lot of clinics, we quote the exact ESWT number before you commit.
Cortisone injection is a covered orthopedic service under virtually every commercial plan and Medicare. Your cost is typically just the copay for a specialist visit and a small injection fee.
Most insurance plans classify ESWT as investigational for orthopedic tendinopathies, despite strong published evidence. We tell you the exact number before you book — no surprise billing.
Onset and durability diverge sharply between these two. Knowing the curve helps you plan around real life.
The local anesthetic in the mix gives you a few hours of immediate relief. The steroid effect kicks in over 24–48 hours and runs its course over weeks to a few months.
Shockwave works on tendon biology, not pharmacology. The timeline is measured in weeks of remodeling, not hours of pain relief.
We won't oversell ESWT, and we won't dismiss cortisone. Here's the honest read on the tendinopathy literature, by site.
Cortisone consistently outperforms placebo in the first 6 weeks for most tendinopathies. The catch is that benefit fades quickly and repeat exposure carries real tissue cost.
ESWT has accumulated strong randomized-trial evidence for chronic tendinopathy at multiple sites, with sustained benefit at 6–12 months that cortisone does not match.
These checklists are a starting point — the final call comes at your evaluation, with ultrasound imaging and exam findings in front of us.
Cortisone is most often the right move when pain has collapsed function and you need a fast, short-term break — used once, with a real plan for what follows.
ESWT is the better call when tissue healing matters more than fast symptom suppression — and when steroid would be the wrong tool for the tendon.
Recovery timelines diverge sharply — cortisone is measured in hours and days, ESWT in weeks and months.
Cortisone is an in-and-out office procedure. Most patients walk out and resume normal activity the same day — though we recommend relative rest from the inciting activity for 2 weeks.
Shockwave triggers a controlled healing response. You'll feel sore for 1–2 days — that's the response working, not a complication. No anesthesia, no downtime, drive yourself home.
PT pairs with both treatments. With cortisone, PT happens while the steroid is calming pain. With ESWT, PT — especially eccentric loading — is what locks in the tendon remodeling.
It's not unusual to use both — just not on the same day and not in the same tendon body.
A common LAOSS pattern for chronic lateral epicondylitis or plantar fasciitis where pain has collapsed function: one cortisone injection now to break the pain cycle, then a shockwave series to address the underlying tendon. The steroid buys you 4–6 weeks of functional relief; ESWT then does the structural work. We typically wait at least 4–6 weeks between a cortisone injection and starting ESWT in the same area, because we want the inflammatory signal that ESWT relies on to be active when treatment starts.
For Achilles and patellar tendinopathies, we generally do not combine them in the tendon body itself — repeat steroid exposure weakens these load-bearing tendons, and the rupture risk is documented. ESWT is almost always the long-term move for these two.
And there are situations where the answer is neither yet — for tendinopathy in the first 4–6 weeks, structured eccentric loading, activity modification, and time often outperform either intervention. We'll tell you that too.
Both options are well-tolerated when delivered by experienced specialists — but the risk profiles are different in kind, not just degree.
Cortisone is one of the most-studied orthopedic interventions. Short-term risks are well-characterized; long-term tendon effects are where the real concern lives.
ESWT has no needle, no medication, and no systemic effect. The real risks are small — the bigger consideration is cost and response variability.
Both cortisone and ESWT at LAOSS are performed by board-certified specialists with deep training in ultrasound-guided injection technique and tendinopathy management. The same physician who does your diagnostic ultrasound performs the treatment — no hand-offs to ancillary staff, no marketing-driven "shockwave packages" sold by a front desk. The person diagnosing is the person treating.
Dr. Acosta saved me from spine surgery. I came in convinced I was going to need an operation. He laid out a non-surgical plan that's been working. So thankful.
Book a visit at any of our eight Los Angeles-area offices. We'll examine the tendon, image it on-site with ultrasound, and tell you straight whether cortisone, shockwave, both in sequence, or neither is the right next step.
