How Long Does Stem Cell Therapy Last for Knees?

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how long does stem cell therapy last for knees 3

One of the biggest questions I get from patients who have knee arthritis and want to avoid knee replacement is how long does stem cell therapy last for knees? Interestingly, we’re the only clinic system on earth that can answer that question as we began offering our patients stem cell therapy for knee arthritis in 2005. Let’s dig in.

What Can Be Treated with Stem Cell Therapy for Knees?

There are many different types of problems in knees where stem cells are used. These include:

  • Knee arthritis
  • Knee tendon tears and tendinopathies (patellar, pes, hamstring, quadriceps, and political tendons)
  • Knee ligament injuries (ACL, MCL, LCL, and PCL)
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What are the Different Stem Cell Types that are Used?

There are a few options on which research exists and some options where no or very little research exists (4). In order to answer the question, “How long does stem cell therapy last for knees?”, we need long-term research on patients that have been followed for many years. We can break down what we know on each stem cell type being offered:

More Research that Shows this Approach Works in Patients with Knee Problems

  • Bone marrow concentrate – this is when the doctor takes your bone marrow aspirate and centrifuges it to concentrate the stem cell fraction. This is often called BMC or BMAC (Bone Marrow Aspirate Concentrate). We are reviewing data here for the Regenexx-SD procedure with is high-dose bone marrow concentrate.
  • Fat – this isn’t really a stem cell procedure because it’s not legal to separate the stem cells from the fat. However, the stem cells may still exert effects to help heal cartilage. A commonly used procedure here is called Lipogems.

Less Research:

  • Amniotic or umbilical cord cells – First, these products are derived from live births and extensive research by third parties and universities has shown that these products have no living stem cells (1-3). While this may come as a surprise as someone told you that this was a type of stem cell procedure that had millions of young cells, regrettably, this was a sales pitch without much reality. In addition, there is no or very little research in real patients that shows either will be effective at helping your knees. This may also come as a surprise as someone told you that there was extensive research on this type of therapy. Regrettably, almost all of that research uses different cells than those used by clinics and it’s almost all in animals and not humans.
  • Exosomes – These are tiny packets of cell to cell communications that have just begun to be used to treat knee arthritis. Again, there is very little research in real patients that shows that exosomes will be effective at helping your knees.

If you want to learn more about these topics, read my mini-book on how to pick a reputable stem cell clinic for your knees:

stem cell clinic guide

How Long Does Stem Cell Therapy Last for Knees?

Right now, only the research on bone marrow stem cells is robust enough to reliably answer the question of how long does stem cell therapy last for knees. Fat based knee treatments will begin to get there in the next few years. Amniotic/umbilical cord products and exosomes have a very long way to go to answer this question. Let’s dig into the data to answer this question for bone marrow since that’s the only data that exists.

To keep this simple, we’ll focus on the outcomes for patients with knee arthritis. Below is a graph from our randomized controlled trial (Regenexx procedure) on the use of bone marrow concentrate (a same day stem cell procedure) to treat knee arthritis patients (5). This takes patients to two years and compares that outcome versus physical therapy (which only lasted 3-months). A higher number here represents better function on this Knee Society Score metric. This KSS score looks at things like the range of motion of the knee and the ability to walk and climb stairs:

how long does stem cell therapy last for knees

First, in looking at that published data, 69% of the patients had achieved success with their knees by two years out. Hence, you can clearly see that in most patients, the positive effect of much-improved function lasts for at least two years, which is all this particular study covered.

We can also look at registry results for Regenexx. This is when patients who are routinely treated for knee arthritis get sent questionnaires to fill out at set time points. You can see here below that these patients do well for four years, as higher is better in this graph. In reviewing this data farther out (not shown), patients that respond can get up to 5-7 years of relief from a single treatment.

how long does stem cell therapy last for knees

In summary, the type of long-term data that can answer the question “how long does stem cell therapy last for knees” only exists for the Regenexx bone marrow based procedure. No one else has published or posted on-line data that would allow us to answer that question. The answer is 5-7 years in about two-thirds of the patients.

The upshot? Answering the question of how long does stem cell therapy last for knees takes some research. However, regrettably, for most of what’s being offered as “stem cell therapy,” there isn’t much published data that allows us to really answer this question. However, that data is available for the Regenexx procedure.



(1) Dustin R. Berger, Nicolette F. Lyons, and Neven J. Steinmetz. In Vitro Evaluation of Injectable, Placental Tissue-Derived Products for Interventional Orthopedics. Interventional Orthopedics Foundation Annual Meeting. Denver, 2015.

(2) Liliya Becktell, Andrea Matuska, PhD, Stephanie Hon, DVM, Michelle L. Delco, DVM, PhD, Brian J. Cole, MD, Lisa A. Fortier, DVM, PhD. Proteomic analysis and cell viability of nine amnion-derived biologics. Orthopedic Research Society Annual Meeting, New Orleans, 2018.

(3) Panero, A. J., Hirahara, A. M., Andersen, W. J., Rothenberg, J., & Fierro, F. (2019). Are Amniotic Fluid Products Stem Cell Therapies? A Study of Amniotic Fluid Preparations for Mesenchymal Stem Cells With Bone Marrow Comparison. The American Journal of Sports Medicine, 47(5), 1230–1235.

(4) Lopa S, Colombini A, Moretti M, de Girolamo L. Injective mesenchymal stem cell-based treatments for knee osteoarthritis: from mechanisms of action to current clinical evidences. Knee Surg Sports Traumatol Arthrosc. 2019;27(6):2003–2020. doi:10.1007/s00167-018-5118-9

(5) Centeno C, Sheinkop M, Dodson E, et al. A specific protocol of autologous bone marrow concentrate and platelet products versus exercise therapy for symptomatic knee osteoarthritis: a randomized controlled trial with 2 year follow-up. J Transl Med. 2018;16(1):355. Published 2018 Dec 13. doi:10.1186/s12967-018-1736-8

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This blog post provides general information to help the reader better understand regenerative medicine, musculoskeletal health, and related subjects. All content provided in this blog, website, or any linked materials, including text, graphics, images, patient profiles, outcomes, and information, are not intended and should not be considered or used as a substitute for medical advice, diagnosis, or treatment. Please always consult with a professional and certified healthcare provider to discuss if a treatment is right for you.

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17 thoughts on “How Long Does Stem Cell Therapy Last for Knees?

  1. Allison S

    You treated my knee with stem cells 5 or 6 years ago (I’m losing track). At the time I couldn’t bend my knee past 90 degrees. I thought of you yesterday and how incredibly fortunate I was to have you treat it. I caught myself with my knee fully bent, sitting on my foot! It continues to improve it seems.
    Thanks for all you do!

  2. Steve

    I’m curious to know what clinical study concluded that cord tissue derived Mesenchymal stem cells have zero living cells.

    1. Chris Centeno, MD Post author

      There are three listed in the references on this page. A fourth out of CSU was just conducted, same results (but not yet published).

  3. Sally

    Does Regenexx do fat stem cell procedures?

    1. Regenexx Team

      Hi Sally,
      No we don’t. We use a fat graft, which is not a stem cell procedure, when needed as a scaffold or support.

  4. Mike Nelli

    I’m now 10+ years out from the C procedure and my knee still feels well enough to play pickup basketball and ultimate frisbee on a regular basis.

  5. Renee

    Any insight on how long does a ACL or a knee ligament last? What are the signs that another injection is needed before it tears again?

    1. Regenexx Team

      Hi Renee,
      The goal is to heal the ACL, which is determined by exam and appearance on MRI. Sometimes more than one injection is needed.

  6. Lim

    I have had stem cell injection to knee by Regenexx International. It was well from 3 months post injection. Only lately, after 2.5 years, the pain started again. It was a localised spot pain.
    Is it okay to re injection again?

    Many thanks

    1. Regenexx Team

      Hi Lim,
      Yes, it would be fine, but a PRP booster may be all that’s needed.

  7. Joseph D. O'Connell

    I understand that you are looking for volunteers to have a stem cell procedure performed in the case of a rotator cuff tear. In 2018 I had such a tear in my left shoulder as a result of exercising. Although I have had two encounters with Physical Therapist neither has been able to help me at all. If you are able to get in touch with me with respect to the study I would very much appreciate it.

    Several years in the past I had received stem cell treatment from Dr. Centeno for a meniscus tear in my left knee and was quite satisfied with the results.


    I Have Had Regennexx Do The Procedure Twice Now. In My Case They Last About Two Years. I Am Now Starting To Feel A Little Pain Again, So I Will Need To Make A Decision On Rather To Have It Done Again.

    1. Chris Centeno, MD Post author

      Yes, that’s the shorter end of the range I often quote as 2-7 years.

  9. John

    I have a 1 cm by 0.6 cm chondral delamination in my knee along the trochlear ridge. By itself it maybe limited me by 3-5% but caused a bit of compensation issues in my hip and Lower back which has stopped me from doing most activities. Would stem cell help with chondral delamination?

    1. Chris Centeno, MD Post author

      It may help that area, but also realize that back issues are a common cause of knee issues as well. So treating only half of the problem may not be the best plan.

  10. Philip Thompson

    I will be starting a stem cell + platelets injection with Regenexx in my right knee after about 7 months of an unsuccessful partial meniscectomy of my posterior medial meniscus (mainly a horizontal lesion). If a second injection might be necessary after a 5 year period, would just a platelet injection might be enough? Thank you

    1. Chris Centeno, MD Post author

      Could be either a platelet booster or another stem cell procedure.

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