Stem cells for the knee and osteoarthritis: what evidence exists
Stem cells are being studied as a possible treatment for knee osteoarthritis. Some small studies show pain improvement, but there is still not enough evidence to recommend them routinely, nor solid proof that they rebuild cartilage.
State of the evidence
Under investigation
Results are promising in small studies, but with different protocols and variable quality.
Educational information prepared by Dr. Belinda Martínez, physician and surgeon. Last updated: October 3, 2026. It does not replace an assessment by a doctor.
What is being studied
In knee osteoarthritis, mesenchymal stem cells obtained from bone marrow, fat or other sources have been injected into the joint, with the aim of reducing inflammation and improving the cartilage environment.
What the studies show
- Several studies and reviews report less pain and better function in the short and medium term.
- Evidence that they significantly regenerate cartilage is limited and varies on imaging.
- Studies differ in cell type, dose, number of applications and follow-up, which makes them hard to compare.
- Many are small and some lack an adequate comparison group.
That is why the clinical guidelines of several medical societies do not yet recommend them as a standard treatment for osteoarthritis and consider them within a research setting.
Which options have more support today
- Therapeutic exercise and muscle strengthening.
- Weight control.
- Medications prescribed by a doctor.
- Injections in selected cases.
- Surgery, including knee replacement, when wear is advanced.
You can review the full picture in our knee pain guide and in the article on whether cartilage regenerates.
What to ask before accepting a treatment
With any biological therapy, it is worth asking these questions and expecting clear, written answers:
- Does it have health authorization for this use? In Mexico, products and procedures involving human cells are regulated by COFEPRIS; you can ask for proof.
- Are there published studies in people with my condition? What results did they show?
- What are the risks and what conventional alternatives exist?
- Who administers it, with what training and in what facility?
- What is the total cost and what happens if it does not work?
When to see a doctor
Seek medical care soon if you have any of these signs:
- Fever, chills or feeling very unwell after a procedure.
- Spreading redness, warmth, pus or increasing pain at the application site.
- Allergic reaction: hives, swelling of the lips or face, difficulty breathing.
- Severe pain that does not improve or gets worse over the days.
Frequently asked questions
Do stem cells rebuild knee cartilage?
There is no solid proof that they do so significantly. Studies mainly show symptom relief in some patients, with variable results.
How much does it cost?
The cost varies widely and there is no standard price. Before paying, ask what is included, what evidence supports the treatment and whether it has health authorization.
Who can be a candidate?
Only a doctor can assess that after reviewing your history, your tests and the available alternatives. In most cases there are better-supported options worth considering first.
Book your free assessment
Dr. Belinda Martínez reviews your case at her office in Guadalajara. The assessment is free of charge and does not commit you to any treatment.
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This content is informational and educational; it is not a diagnosis or a treatment recommendation. If you have any symptoms, consult a health professional.