Prolotherapy vs. PRP vs. Cortisone vs. Shockwave: Which Injection Therapy Actually Fits Your Injury?
The injury that won't heal is its own kind of exhaustion. You've rested it, iced it, done the exercises, maybe even had one cortisone shot already - and you're still not back to running, riding, or doing the thing that keeps you sane.
Prolotherapy, PRP, cortisone, and shockwave therapy all get recommended for chronic soft tissue injuries and joint pain. They work through completely different mechanisms, and choosing the wrong one doesn't just waste money - it can delay the tissue response your injury actually needs.
Direct Answer
Prolotherapy uses an irritant solution (typically dextrose) to stimulate your body's own repair response in weakened ligaments, tendons, or joints. PRP concentrates your own platelets to deliver growth factors directly to damaged tissue. Cortisone reduces inflammation fast but doesn't repair structure. Shockwave therapy uses acoustic energy to break up calcification and trigger healing without injections. Each fits a different type of injury, timeline, and goal.
Key Takeaways
Prolotherapy works best for chronic ligament laxity, tendon degeneration, and joint instability, where the tissue needs a repair signal rather than just pain relief.
Cortisone is the fastest option for acute inflammation, but it doesn't rebuild damaged tissue and can weaken it with repeated use.
PRP delivers concentrated growth factors and is best suited for partial tendon tears and early-to-moderate osteoarthritis.
Shockwave therapy is non-injectable, effective for calcific tendinopathy and plantar fasciitis, and requires no recovery downtime.
The right choice depends on your injury type, how long it's been present, and what your tissue actually needs - not which option sounds most advanced.
Why Do So Many Chronic Injuries Fail to Heal on Their Own?
Tendons and ligaments have a poor blood supply. That's not a minor detail - it's the core reason a hamstring tendinopathy that's been bothering you for eight months doesn't just resolve with rest the way a muscle strain does.
Without adequate blood flow, the tissue can't deliver the cellular machinery needed to remodel damaged collagen. The injury enters a state called tendinosis: not acute inflammation, but chronic degeneration. The tissue looks different under imaging, behaves differently under load, and responds differently to treatment.
This is why the same treatment that works beautifully at week two can be the wrong call at month six. The biology has changed. The treatment strategy has to change with it.
Most people don't get that explanation. They get a prescription for physical therapy, a cortisone shot if it's bad enough, and a follow-up in six weeks. When that doesn't resolve it, the options start to feel confusing.
That's exactly the decision point where understanding the mechanism of each treatment - not just the name - makes the difference.
What Is Prolotherapy and How Does It Actually Work?
Prolotherapy is a regenerative injection technique that uses an irritant solution, most commonly hyperosmolar dextrose, to trigger a controlled inflammatory response in damaged or lax connective tissue.
The mechanism isn't magic. When the solution is injected into a weakened tendon insertion or ligament, it causes localized irritation that the body interprets as a new injury signal. That signal recruits fibroblasts - the cells responsible for producing collagen. The result, over several treatment cycles, is new collagen deposition and tissue tightening.
This is why prolotherapy is categorically different from cortisone. Cortisone suppresses inflammation. Prolotherapy creates a targeted, temporary one to restart a stalled repair process.
A 2021 network meta-analysis published in PLoS One reviewed 87 randomized controlled trials involving 5,859 participants that studied injection therapies for chronic soft tissue injuries. For shoulder injuries followed beyond eight months, prolotherapy showed a pain improvement effect size of 2.08 (95% CI 1.49 to 2.68) over placebo. For elbow injuries at four to eight months, the effect size was 0.91 (95% CI 0.12 to 1.70). (PLoS One / University of Malaya Sports and Exercise Medicine Research and Education Group, 2021)
Those aren't dramatic numbers at short follow-up - and that's the honest part. Prolotherapy is a slow treatment. It's not the right choice if you need to be back on the trail in three weeks.
When Does PRP Make More Sense Than Prolotherapy?
PRP, or platelet-rich plasma, is an autologous treatment - meaning it's made from your own blood, concentrated to increase the platelet count, and injected into the target tissue.
Platelets carry growth factors including PDGF, TGF-beta, and VEGF. When concentrated and delivered directly to damaged tissue, they accelerate the body's natural repair signaling. The mechanism is amplification, not irritation.
PRP tends to outperform prolotherapy when there's actual structural damage rather than just laxity or degeneration. A partial rotator cuff tear, a significant patellar tendinopathy, or early-to-moderate knee osteoarthritis are all conditions in which the growth factor load of PRP can drive more substantial tissue remodeling.
A 2020 randomized controlled trial found a statistically significant difference in immediate pain relief, lasting up to 3 months, for patients receiving hyperosmolar dextrose prolotherapy versus hyaluronic acid for knee osteoarthritis. (Chung et al., 2020) That's useful data, but it also shows that prolotherapy's strength is in the medium term, not the immediate window.
Consider a typical case: a recreational cyclist with a six-month history of patellar tendinopathy who's tried physical therapy and a single cortisone shot with no lasting improvement. PRP at the tendon insertion, followed by a structured load progression, is often the better approach than prolotherapy alone because the tissue needs growth-factor signaling, not just a repair trigger.
WOS Performance Clinic evaluates exactly this kind of decision with imaging, movement assessment, and a clear explanation of what the tissue actually needs before recommending any injection.
If you're at that decision point and tired of guessing, scheduling a consultation at WOS Performance Clinic is the most direct way to get a specific answer for your specific injury.
Why Cortisone Isn't the Enemy - and Isn't the Solution Either
Cortisone gets a bad reputation in regenerative medicine circles, and some of it is deserved. But the honest framing is simpler: cortisone does exactly what it's designed to do. It just doesn't do what chronic injuries need.
For acute bursitis, a severe tendon flare that's preventing sleep, or an inflammatory episode in an arthritic joint before a major event, cortisone is a legitimate tool. It reduces pain quickly, allowing movement and enabling rehab to start.
The problem is when cortisone becomes the primary treatment for a chronic degenerative condition. Repeated cortisone injections into a tendon can reduce collagen synthesis and weaken the tissue structure over time. You feel better. The tissue is worse. That gap is where re-injury happens.
The contrarian claim worth stating plainly: the most dangerous thing about cortisone isn't the injection itself - it's the false recovery signal it sends. Feeling 80% better after a shot doesn't mean the tissue is 80% healed. For athletes who interpret pain relief as clearance to return to full load, that gap is where Achilles tendons rupture and rotator cuffs finish tearing.
The "Repair Signal" Framework: A Decision Tool for Choosing the Right Treatment
The Repair Signal Framework is a three-question decision tool for matching treatment type to injury biology.
Use it before your appointment to understand what you're actually asking for:
Question 1: Is there active inflammation?
Yes, acute: cortisone or rest first. No, chronic/degenerative: move to question 2.
Question 2: Is the primary problem laxity, instability, or degeneration without significant structural damage?
Yes: prolotherapy is the candidate. Structural damage present (partial tear, significant cartilage loss): PRP or combination therapy.
Question 3: Is there calcification, or is this a tendinopathy that hasn't responded to load-based rehab?
Yes: shockwave therapy, alone or combined with injection therapy.
This framework doesn't replace clinical evaluation. It organizes the conversation so you walk in knowing what question you're actually trying to answer.
Who These Treatments Are Not Right For
Regenerative injections aren't appropriate for everyone, and honest care means saying so clearly.
Prolotherapy is not the right call for acute injuries, complete tendon or ligament ruptures, or anyone with active infection near the injection site. It's also not appropriate as a substitute for surgery when structural integrity is gone.
PRP requires a baseline platelet count and clotting function that some patients can't meet. It's also not a substitute for addressing the mechanical load pattern that caused the injury. Growth factors can rebuild tissue; they can't fix the training error or biomechanical fault that keeps breaking it down.
Shockwave therapy isn't appropriate over open wounds, near growth plates in skeletally immature athletes, or in tissue with active malignancy.
Cortisone should be used sparingly in tendons, avoided in weight-bearing tendons with significant degeneration, and not repeated more than a few times at any single site.
The right provider doesn't just offer these treatments - they tell you when not to use them.
FAQ
How many prolotherapy sessions will I actually need before I see results?
Most people need between three and six sessions, spaced four to six weeks apart, before seeing meaningful improvement. The repair process is biological, not mechanical - collagen remodeling takes time, and the response varies based on injury severity, location, and your individual healing capacity. Some people notice improvement after two sessions; others need the full course.
Can I combine prolotherapy with PRP or shockwave therapy?
Yes, and in some cases, combination therapy is the most effective approach. A common scenario is using shockwave therapy to break up calcification and stimulate initial healing, followed by PRP or prolotherapy to support tissue remodeling. The sequencing matters and should be determined by your specific injury presentation, not a protocol applied uniformly.
Is prolotherapy covered by insurance?
Most insurance plans in the United States don't cover prolotherapy because many carriers classify it as investigational or experimental, despite a growing body of clinical evidence. PRP is similarly not covered in most cases. Cortisone injections typically are covered. It's worth asking your provider for a specific breakdown before your first appointment.
How is prolotherapy different from a steroid injection?
They work in opposite directions. Cortisone suppresses the inflammatory response to reduce pain. Prolotherapy creates a controlled, localized inflammatory signal to restart a stalled repair process. One is for acute flares; the other is for chronic degeneration, where the tissue has stopped healing on its own.
Will these treatments hurt, and how much downtime should I expect?
Prolotherapy and PRP injections typically cause soreness at the injection site for two to five days after treatment - that's part of the mechanism, not a complication. Shockwave therapy can cause temporary discomfort during and after the session. Cortisone injections usually cause minimal post-procedure soreness. None of these treatments requires significant downtime, though high-intensity training is typically restricted for a short window after injection.
I've had a cortisone shot that helped for three months and then wore off. Does that mean I need surgery?
Not necessarily. A cortisone shot that provides temporary relief confirms there's an inflammatory component to your pain, but wearing off doesn't mean the underlying problem is surgical. It often means the tissue needs a repair-oriented treatment rather than ongoing inflammation suppression. A proper evaluation, including imaging and movement assessment, can clarify whether you're dealing with degeneration that responds to regenerative therapy or structural damage that doesn't.
How do I know which treatment is right for my specific injury without just guessing?
You don't - and you shouldn't have to. The decision depends on imaging findings, how long the injury has been present, what you've already tried, and what the tissue actually looks like under evaluation. A sports medicine physician who works with these treatments regularly can map your injury to the right tool. That's the evaluation WOS Performance Clinic is built around.
The treatment that sounds most advanced isn't always the right one. The right one is the one that matches what your tissue actually needs at this stage of its pathology.
If you've been managing a chronic injury with rest, ice, and hope - and it's still there six months later - that's not bad luck. That's a signal the tissue needs something different. WOS Performance Clinic offers a thorough evaluation with Dr. Erin Wos to identify exactly what that is and build a plan around it.
Schedule your consultation at WOS Performance Clinic and get a specific answer for your specific injury.
About the Author
WOS Performance Clinic is a sports medicine practice in Eugene, Oregon, led by board-certified Sports Medicine Physician Dr. Erin Wos. The clinic specializes in regenerative treatments, including PRP injections, shockwave therapy, and MLS laser therapy, serving runners, cyclists, endurance athletes, youth athletes, and active individuals at every level. Their approach combines evidence-based diagnostics with individualized treatment planning to help patients recover from injury, manage chronic pain, and perform at their best.
