Stem cell therapy for knees costs about $4,000 to $12,000 per knee in the US, and you pay it yourself. The knee is the most-marketed and most-studied joint for these injections. It is also where the evidence caveat matters most, because clinics often imply more benefit than the research supports. This guide covers the cost, the recovery, the alternatives, and what the data actually shows.
The knee draws the most attention for a simple reason. Knee osteoarthritis is common, painful, and slow to treat with surgery. That demand is exactly why so many clinics advertise “stem cells for knees.”
How much a stem cell knee injection costs
A single stem cell knee injection usually runs $4,000 to $12,000, with most people paying $5,000 to $8,000. The wide range reflects the cell source and what the clinic bundles in.
Bone marrow procedures, which draw and concentrate your own cells, often sit at the higher end. Same-day fat or blood-based products can cost less. Donated umbilical cord products vary widely.
Two costs surprise people. Treating both knees roughly doubles the price. And many clinics recommend a second injection at six months, so ask for the full first-year total. Our knee cost breakdown itemizes each line.
| What you might be quoted | Typical range |
|---|---|
| One knee, single injection | $4,000 – $8,000 |
| One knee, complex/cultured cells | up to $12,000 |
| Both knees | $8,000 – $16,000 |
| Add-on PRP or imaging | $500 – $2,000 |
What recovery looks like
Recovery from a stem cell knee injection is usually short and outpatient. You go home the same day. There is no incision and no hospital stay.
Expect soreness, mild swelling, or stiffness in the knee for a few days. Most clinics ask you to avoid heavy loading, running, or deep squats for one to two weeks. Some pair the injection with physical therapy.
Judging benefit takes patience. Clinics often say results build over three to six months. That long window makes it hard to separate a real effect from normal recovery, rest, and the placebo response.
What the evidence shows for knees
The evidence for stem cell knee injections is limited and low-certainty, which is the most important thing to know before paying. The knee has more studies than any other joint, so this is the best-case data.
A 2025 Cochrane review of stem cell injections for knee osteoarthritis pooled 25 studies with 1,341 people. Comparing stem cell injections with placebo, it found they may slightly improve pain and function, based on low-certainty evidence. The reviewers were uncertain about quality of life and about whether patients rated the treatment a success.
Two points deserve emphasis. The review found no clear proof that the injections change the knee’s structure or regrow cartilage. And it flagged uncertainty about safety. “May slightly improve” on low-certainty evidence is a long way from the “regenerate your knee” language on many clinic sites.
Stem cells vs other knee treatments
For knee pain, several cheaper and better-studied options exist. Compare them before you commit thousands to stem cells.
| Treatment | Typical cost | Insurance? | Evidence for knees |
|---|---|---|---|
| Physical therapy | $50 – $150 / visit | Often yes | Strong |
| Cortisone injection | $100 – $400 | Often yes | Good short-term relief |
| Hyaluronic acid injection | $300 – $1,500 | Sometimes | Modest |
| PRP injection | $500 – $2,500 | Rarely | Mixed, some knee benefit |
| Stem cell injection | $4,000 – $12,000 | No | Limited, low-certainty |
When people still choose stem cells: usually after therapy and simpler injections have failed and they want to delay knee replacement. That can be a reasonable personal choice. It is not the same as a proven one, and the cost gap is large. See how PRP compares in our PRP vs stem cell guide.
Do the cost math before you commit
Run the arithmetic before you agree to anything. A worked example shows how a single quote grows.
A clinic quotes $6,000 for one knee. It suggests a second injection at six months for “best results.” Your real first-year cost is $12,000, not $6,000. Treat both knees, and you are near $24,000.
Now compare the alternative. Physical therapy plus a cortisone injection often runs a few hundred dollars and is usually covered. Hold that number next to the quote before you decide.
Questions to ask before you pay
Ask the clinic these before any deposit. Clear answers signal a careful provider.
- What cells are used, and where do they come from?
- Is the product FDA-approved for knees? (The answer is no.)
- What is the total cost, including any second injection?
- What does the recommended course include, and what is the refund policy?
- What does the published evidence show for my specific knee condition?
A knee injection is not FDA-approved, is not insurance-covered, and rests on low-certainty evidence. If a clinic downplays any of those three facts, that is your signal to slow down. Compare your other conditions on the conditions hub, and price the full picture in the cost hub.
The bottom line
Stem cell therapy for knees costs $4,000 to $12,000 per knee, and the best available evidence, a Cochrane review, shows only a possible slight benefit at low certainty. Budget the full first-year total, price physical therapy and PRP alongside it, and read any “regrow your cartilage” claim as marketing rather than medicine.
Frequently asked questions
How much does a stem cell knee injection cost?
A single stem cell knee injection usually costs $4,000 to $12,000 in the US, with most people paying $5,000 to $8,000. Treating both knees roughly doubles the total. Our knee cost breakdown itemizes what's included.
Does stem cell therapy work for knees?
The evidence is low-certainty. A 2025 Cochrane review found stem cell knee injections may slightly improve pain and function versus placebo, but certainty is low and no study proves cartilage regrowth. Manage your expectations accordingly.
Is stem cell therapy for knees FDA-approved?
No. The FDA has not approved any stem cell product for knee osteoarthritis. Clinics offering knee injections operate outside FDA approval, which is why insurance does not cover it.
How long is recovery after a stem cell knee injection?
Recovery is usually short. The procedure is same-day and outpatient. Expect knee soreness for a few days and light activity limits for one to two weeks. Full assessment of any benefit takes months.
What are the alternatives to stem cell knee injections?
Physical therapy, cortisone injections, and PRP all cost far less and are better studied for knee pain. Many are insurance-covered. Weigh these before paying for stem cells.
Can stem cells help a bone-on-bone knee?
There is no good evidence that stem cell injections restore a bone-on-bone knee. At that stage the cartilage is gone, and no injection is proven to rebuild it. A knee replacement consult is usually the more useful step. Be wary of clinics that promise otherwise.
Medical disclaimer. Medical Frontier is an independent educational resource. This page is for general information only and is not medical advice, diagnosis, or treatment, and does not create a doctor–patient relationship. Most regenerative therapies discussed here are not FDA-approved for the uses described and may be offered under limited exemptions or in clinical trials only. Always consult a licensed physician before making any treatment decision.