Prolotherapy is a regenerative injection treatment that uses a carefully concentrated solution, most commonly dextrose-based, to create a controlled inflammatory response at the exact site of damaged or lax connective tissue. That response recruits the cells responsible for collagen production and restarts a repair process the body quietly abandoned before the job was done.
Key Takeaways
- Prolotherapy works by deliberately restarting the body's own repair process in tissues where healing has stalled, not by masking pain or reducing inflammation
- It's best suited for chronic ligament, tendon, and joint instability that hasn't resolved with rest, physical therapy, or anti-inflammatory care
- Treatment involves a series of injections spaced weeks apart because the goal is actual tissue remodeling, which follows a biological timeline
- WOS Performance Clinic uses prolotherapy as part of an individualized plan built around a thorough evaluation, not as a standalone procedure
- Results depend on accurate diagnosis, precise injection technique, and patient-specific factors including tissue quality, injury history, and activity level
Why Does a "Healed" Injury Keep Causing Problems?
It's a frustrating pattern. You rested the joint. You iced it, avoided the activities that aggravated it, maybe completed a full course of physical therapy. The acute pain faded. And yet, months or years later, the joint still doesn't feel right. It's unstable, unreliable, or simply never recovered its original strength and function.
The explanation for this isn't mysterious once you understand what the body actually does during soft tissue repair. When a ligament or tendon is injured, the body launches an inflammatory response to clear debris and begin rebuilding. But that process doesn't always complete the job. Once the initial inflammation resolves, the body can downregulate its repair signals, treating the tissue as "good enough" even when the structural repair is genuinely incomplete.
What's left is connective tissue that has lost some of its tensile strength and mechanical stiffness compared to the original. The joint may appear healed on imaging that isn't sensitive to subtle laxity. It doesn't hurt the way an acute injury does. But it loads differently, compensates differently, and fails under stress in ways that accumulate over time.
This is the specific problem prolotherapy is designed to address.
What Exactly Happens During a Prolotherapy Injection?
The mechanism is precise, and understanding it changes how you evaluate the treatment.
A solution, typically dextrose at a therapeutic concentration, is injected directly into the affected ligament, tendon, or joint capsule attachment points. The solution is mildly hyperosmotic, meaning it creates a local osmotic disruption that signals tissue damage to the surrounding cells. That signal triggers the body to launch a fresh inflammatory response at that exact location.
That response recruits fibroblasts, which are the cells the body uses to produce new collagen. As treatment progresses across multiple sessions, new collagen is deposited at the injury site. Over time, that collagen matures and cross-links, which is the process that gives connective tissue its actual mechanical strength. A ligament that's been functioning as a partially repaired structure starts to behave more like its original self: stiffer, more organized, better able to stabilize the joint under load.
This is why prolotherapy takes multiple sessions and why the timeline can't be compressed. You're not suppressing a symptom. You're guiding a biological process through stages that each have their own pace.
Consider a common scenario in sports medicine: a runner dealing with chronic lateral ankle instability after repeated sprains over several years. The acute injuries resolved, but the lateral ligaments never regained their original stiffness. Each time the runner returns to training, the ankle feels unreliable. In a situation like this, prolotherapy targets those specific ligament attachment points to reinitiate the repair cascade that stalled after the initial injuries. Progress unfolds across multiple treatment sessions, with each one building on the collagen response from the last.
The non-obvious detail that matters here is injection placement. The solution only works if it reaches the actual site of laxity. That requires knowing which specific structures are involved and placing the injection precisely at the attachment points, not just in the general area. This is a procedural skill, not just a protocol.
When Is Prolotherapy the Right Call?
Not every painful joint is the right candidate. Getting the indication wrong means spending time and effort on an intervention that isn't matched to the actual problem.
At WOS Performance Clinic, the decision to use prolotherapy starts with a comprehensive evaluation by Dr. Erin Wos. That evaluation looks at the specific tissue involved, how long the problem has been present, what's already been tried, and what the patient's goals are, whether that's returning to competitive running, getting through a cycling season, or simply moving without managing around a joint that never quite recovered.
Prolotherapy tends to be a strong fit when the tissue involved is a ligament, tendon, or joint capsule rather than a muscle belly or bone. It's most appropriate when the problem has been present long enough that acute healing is no longer active, typically beyond six to eight weeks without meaningful improvement. Clinical or imaging evidence of laxity, looseness, or incomplete structural repair is a clearer indicator than pain alone. And it's generally considered after conservative care has been genuinely tried and hasn't resolved the issue.
Prolotherapy is less likely to be the right first step when there's a complete structural tear that needs surgical reconstruction, when the presentation is primarily an acute inflammatory flare rather than chronic instability, or when the diagnosis is still unclear.
That last point deserves emphasis: injecting a joint before the diagnosis is accurate doesn't fix the problem, it just adds a procedure to an unresolved picture. The evaluation comes first.
Acting on a Chronic Injury vs. Waiting It Out
This comparison matters because waiting feels like the cautious choice. It rarely is.
| Situation | What Actually Happens |
|---|---|
| Getting a thorough evaluation and pursuing prolotherapy for the right indication | The underlying tissue laxity is addressed. The joint becomes more structurally sound. You return to training with a foundation that supports full activity rather than constantly compensating around an incomplete repair. |
| Waiting and hoping the joint resolves on its own | Chronicity deepens. Compensatory movement patterns develop and become habitual. Adjacent tissues absorb loads they weren't designed for. The window for the most straightforward intervention narrows over time. |
| Managing with NSAIDs or cortisone injections long-term | Symptoms are temporarily quieted, but the structural problem isn't touched. Chronic anti-inflammatory use can actually interfere with the collagen repair process you'd eventually need prolotherapy to restart. |
| Continuing training without addressing instability | The mechanical deficit persists. Each loading cycle under an unstable joint accumulates wear on cartilage, adjacent tendons, and supporting structures. Secondary injuries become more likely. |
The cost of waiting isn't zero. It's a longer recovery arc, more secondary damage to address, and in some cases a narrowing of which treatment options remain viable.
Realistic Outcomes and Honest Timelines
Prolotherapy isn't a quick fix, and anyone who presents it that way isn't giving you the full picture.
Treatment involves multiple sessions because each one is contributing to a cumulative biological process. The spacing between sessions allows the collagen response from one treatment to progress before the next one adds to it. Compressing the timeline doesn't accelerate results because it disrupts that sequence.
After a session, it's normal to experience soreness and mild swelling at the injection site for several days. That response is the inflammatory signal doing its job. This is why anti-inflammatory medications, including NSAIDs like ibuprofen, should be avoided in the days immediately following treatment. Taking them suppresses the exact mechanism prolotherapy is trying to trigger.
Pain reduction often lags behind structural improvement. You may notice the joint feeling more stable, more reliable under load, before you notice a significant reduction in pain. That sequence makes biological sense: the tissue is rebuilding first, and the pain response catches up later.
If treatment is progressing and the diagnosis is accurate, improvement should be observable across the course of treatment. If it isn't, that's clinically significant information. It means the diagnosis, the injection placement, or the treatment approach needs to be reassessed. Prolotherapy works for the right problem. It isn't a universal answer for all joint pain.
Who Isn't a Good Candidate?
Prolotherapy isn't appropriate when there's an active infection near the injection site, a bleeding disorder, or anticoagulant therapy that can't be managed appropriately around the procedure. It's not the right intervention for complete ligament or tendon ruptures that require surgical reconstruction. And while prolotherapy may reduce pain and improve function in early to moderate joint degeneration, it won't reverse significant structural cartilage loss.
The most important disqualifier isn't a medical contraindication. It's an inaccurate diagnosis. Treating the wrong tissue, or treating a joint whose pain comes from a different source entirely, produces no benefit and delays the care that would actually help. This is why WOS Performance Clinic's process starts with evaluation rather than a treatment menu.
If you're unsure whether your injury fits, that uncertainty is a reason to get evaluated, not a reason to wait.
Frequently Asked Questions
How many sessions does prolotherapy typically require?
Treatment involves multiple sessions spaced several weeks apart because each session contributes to a cumulative collagen-building process. The exact number depends on the tissue involved, how long the injury has been present, and how the individual's body responds to each treatment. Your provider should be reassessing progress across the course of treatment and adjusting the plan based on what they observe.
Is prolotherapy painful?
It's more uncomfortable than a standard single-site injection because the solution is placed at multiple points along the affected tissue rather than one location. Most patients describe a deep aching pressure rather than sharp pain, and it resolves quickly during the procedure. The post-treatment soreness, which lasts for several days, is an expected part of the process, not a sign of a problem.
Can I continue training during prolotherapy?
In most cases, yes, with modifications. You'll want to reduce training intensity in the days immediately following each injection to avoid disrupting the inflammatory repair response. Your provider will give specific guidance based on the tissue being treated and your sport. Staying active at an appropriate level is generally preferable to complete rest.
Why can't I take ibuprofen after a session?
Anti-inflammatory medications suppress the inflammatory cascade that prolotherapy is specifically designed to trigger. Using them in the days following an injection works against the treatment mechanism. Acetaminophen is generally appropriate for managing discomfort during that window without interfering with the repair process.
How is prolotherapy different from PRP?
Prolotherapy uses a dextrose solution to create a controlled irritant response that recruits fibroblasts and stimulates collagen production. Platelet-rich plasma (PRP) uses concentrated growth factors derived from your own blood to deliver a more complex biological signal. Both approaches restart tissue repair, but through different mechanisms and with different levels of biological intensity. PRP is typically used when tissue damage is more substantial or when a stronger growth factor signal is indicated.
What's the best way to know if my injury is right for prolotherapy?
The clearest indicators are chronic ligament or tendon laxity, an injury that hasn't improved meaningfully after genuine conservative care, and a clinical picture of instability rather than active acute inflammation. The only reliable way to know is a proper hands-on clinical evaluation, because the same symptom pattern can come from several different tissue problems, and prolotherapy only works when the right structure is being treated.
What happens if prolotherapy doesn't produce results?
A lack of response is clinically meaningful information. It points toward reassessing the diagnosis, reviewing the injection technique and sites, or considering a different regenerative approach such as PRP or shockwave therapy. WOS Performance Clinic treats the absence of expected progress as a signal to dig deeper, not as a conclusion. The goal is to find what actually resolves the problem, whether or not that ends up being prolotherapy.
If you've been managing the same injury for months without a real resolution, and rest and anti-inflammatories haven't gotten you back to where you want to be, a thorough evaluation at WOS Performance Clinic is the right starting point. Dr. Erin Wos will assess what's actually happening with the tissue, determine whether prolotherapy fits your situation, and build a treatment plan around your specific goals. Schedule a consultation and find out whether prolotherapy belongs in your recovery.
About WOS Performance Clinic
WOS Performance Clinic is a sports medicine clinic in Eugene, Oregon, led by board-certified Sports Medicine Physician Dr. Erin Wos. The clinic offers regenerative treatments including PRP injections, shockwave therapy, and MLS laser therapy alongside personalized injury rehabilitation and performance care. WOS Performance Clinic serves runners, cyclists, endurance athletes, youth athletes, and active individuals throughout the Eugene area.
