Culture Expanded Stem Cells for Knee Arthritis

By /

knee stem cell injectionI evaluated an interesting patient down at our Cayman Islands advanced stem cell practice site recently in that his MRI changes were fascinating. While I see patients every day who are improving and have great stories, many times I just don’t have the time to write up what’s happening. However, every once in a while, I see something that’s really interesting and want to share. Since this patient’s MRI shows some amazing post-injection improvements, it’s worth sharing this morning. In particular his knee MRI shows improvements in his knee meniscus and bone.

Why Arthritis May Be More About the Bone than the Cartilage

Simple messaging works in medicine, even though it may not be accurate. Take, for example, the idea that high cholesterol is bad and that you need drugs to lower it. The messaging is simple, but now inaccurate. Turns out that for most of us, high total cholesterol isn’t associated with heart disease, and drugs to lower it have barely there effects. However, that doesn’t stop Madison Avenue from pushing that powerful messaging.

The same holds true for knee arthritis. The simple message is that cartilage cushions the joint and that when it wears out, the joint hurts. However, regrettably, that’s not necessarily true. For example, if you were to take MRIs of the knees of 100 middle-aged or elderly people and only half had knee pain, you would struggle to place the patients with knee pain in the right category just by looking at the status of their cartilage loss on the MRIs. Why? Turns out that cartilage loss is a pretty poor predictor of who has knee pain. Why then do doctors seem to have a cartilage-loss fetish? Like many things in medicine, our focus is misguided by the business of cartilage repair.

If you can’t predict who has knee pain just by looking at the knee MRI image and looking for lost cartilage, is there something else that can predict knee pain more reliably? Yes, it’s called a bone marrow lesion (BML, or also known as bone marrow edema, or BME). This is a swollen area in the bone where there are likely small microfractures occurring. It used to be thought that this happened because of lost cartilage, but we now know that this occurs because of a complex interaction between the bone and cartilage. We also know that these areas hurt.

In conclusion, if you had to look at one thing on a post stem-cell-injection MRI that was really exciting, getting rid of these painful BMLs would be it. This is exactly what happened on this patient’s MRI. However, before we get into what changed, you need to learn a little more about the knee meniscus.

Request a Regenexx Appointment

Chopping Up the Meniscus?

This patient had a meniscectomy, meaning that a part of his meniscus was removed because it was torn. Despite the fact that multiple high-level research studies have shown this to be a useless and ineffective surgery, it’s still being performed worldwide. The meniscus is half a ring of spacer tissue, so one of the things that happens when you cut out pieces of it is that the ring weakens. This results in parts of this ring-shaped structure extruding outside the joint, which then causes more pressure on the cartilage surfaces. This last change in the function of the meniscus is well documented in research studies showing a dramatic rise in contact pressures of the joint as more and more meniscus is removed.

Interesting MRIs

This patient is an active middle-aged guy who noted marked problems running and exercising after knee meniscectomy surgeries. He was noted to have arthritis on the inside of his knee joint and a meniscus that was extruding outside the joint and leaving it unprotected. His first treatment was with culture-expanded stem cells at the Grand Cayman advanced-practice site, and his opposite knee responded with about 80% improvement. However, while that knee had a meniscus that was minimally extruded, the side that didn’t respond had an even bigger meniscus extrusion issue. That knee also had a BML, so Dr. Schultz treated both the bone and the meniscus at a second treatment session by precisely injecting culture-expanded stem cells into these areas. This included placing a needle under fluoroscopic guidance into the damaged bone. He was back for another treatment on that knee when I saw him this last week, as he’s been getting incremental improvement with each round of injections.

Note the before and after MRIs below, which show his BML. On the left, note that the bright spot in the dark bone that’s in the yellow-dashed line changes from the before to after image. This area becomes normally dark, meaning no more BML. There is now a BML on the tibia, which will be treated this trip.

Also note that there is another curious change. The meniscus position in the before image on the left (the dark triangle-shaped structure in the red-dashed circle, above) is out of the joint and displaced. In the after image, the meniscus is now tucked tightly inside the joint where it belongs. This is likely due to the fact that Dr. Schultz precisely injected the meniscus as well, with the goal of getting better quality and tighter tissue.

There have also been positive changes in the posterior meniscus MRI as well. Note the large bright spot in the dark triangle in the left before image (yellow-dashed circle). Note that this is smaller in the after image on the right. This is consistent with meniscus repair because normal meniscus signal on MRI is dark. Both of these improvements on imaging are consistent with his reported clinical improvement.

meniscus stem cell treatment

The upshot? While not all patients who get relief see changes on their MRIs, it’s always interesting to see what changes and why. In particular, improvement in painful BMLs are a consistent finding. The meniscus repositioning is also something we’ve been paying closer attention to this past year. We hope that this patient can continue to get great improvements!

The Regenexx-C procedure is not approved by the US FDA and is only offered in countries via license where culture-expanded autologous cells are permitted via local regulations. 

Join us for a free Regenexx webinar

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.

Get Blog Updates by Email

By submitting the form, you are agreeing that you read and consent to our Privacy Policy. We may also contact you via email, phone, and other electronic means to communicate information about our products and services. We do not sell, or share your information to third party vendors.

Leave a Reply

Your email address will not be published. Required fields are marked *

9 thoughts on “Culture Expanded Stem Cells for Knee Arthritis

  1. Dr. Scott Davis

    I continue to watch and read your blog information. This one is important because I had no idea how many injections may be necessary for a knee with meniscus surgery and arthritis until here.
    As noted in my initial email, I’m by no means a wealthy man, and for a smile, just ask my wife of 43 years. At $4000-5000 a pop, I’d go poop long before you get the joint back to the energetic level of yesterday.

    1. Regenexx Team Post author

      Dr. Davis,

      Most patients get one stem cell procedure, some get additional procedures. It all depends on what’s going on with your knee in particular. Congrats on 43 years of marriage!

  2. Rosa E Rios

    Wow. Every time I read your stories about procedures & outcomes I’m mostly impressed. I follow your blog’s posts closely and one day I’ll visit the clinic you have partnerer or licenced here in Australia.
    I wish these procedures would become more accessible by us than what they are now.
    God bless your inspiration & work

  3. Jim Chrin

    I’am on my 3rd week of recovery of a stem cell and prp blood injection,and am off my crutches, and walking, Dr Shah and his nurse Angie from South East Pain Mgt Horsham,Pa were the best team ever. I was scheduled for surgery 1 week before my injection and canceled i was sure glad i did.I thank Drs Shah,Centeno,Shultz and Regenexx for giving me back my Quality of life.But the most amazing thing was that Dr.Shah and Nurse Angie sincerely care for their patients in which to me is priceless! Thank You
    Jim Chrin

    1. Regenexx Team Post author

      Wonderful news Jim! Will pass along the shoutout to Dr. Shah and Angie.

    2. Warren Griggs

      I do not believe that our paths have crossed at Southeast Pain Management, but I too had the stem cell replacement therapy which started on December 8, 2016 and very much like you, I could not possibly be happier with the results in as much as I am pain-free in my left knee for the first time in many years. Dr. Shah and the entire staff are 100% competent, capable and a pleasure to deal with. I am looking forward to having the same procedure on my right knee soon.
      Warren Griggs

      1. Regenexx Team Post author


        Wonderful to hear! We’ll pass along to Dr. Shah and his staff!

  4. Wirt T. Mscey

    What you refer to as bone marrow edema or BME, sounds a lot like Modic Changes in the vertebrae, with which I have been diagnosed, along with desiccated and bulging discs, arthritic changes, and other problems.

    According to your blog, Dr. Schultz injected bone marrow derived stem cells directly into the BME affected bone adjacent to the meniscus and the result was a significant reduction in the BME.

    What are your thoughts about injecting stem cells directly into the vertebrae in the area of modic changes ??

    BTW, I have had several Regenexx PRP and same day stem cell procedures in both of my worn out knees, both of my worn-out shoulders, both hands and both feet and my worn out back. I had pretty good results with the knees, hands and feet; moderately good results with the shoulders; and, regretfully, little or no help with the back. Not surprisingly, the back is the most painful problem, sometimes completely debilitating.

    I’m currently scheduled for a visit to the Cayman Islands clinic in early March for the initial BMA and a PRP procedure to the ligaments in the back. Stem cell reinjections to the knees and shoulders are scheduled during May and June.


    1. Chris Centeno Post author

      We’ve often discussed injecting vertebral modic changes, but ave yet to do so. We do generally see these get better after intra-discal injections.

Is Regenexx Right For You?

Request a free Regenexx Info Packet


Learn about the #1 Stem Cell & Platelet Procedures for treating arthritis, common joint injuries & spine pain.

Join a Webinar


Get fresh updates and insights from Regenexx delivered straight to your inbox.

Subscribe to the Blog


9035 Wadsworth Pkwy #1000
Westminster, CO 80021


Copyright © Regenexx 2021. All rights reserved. | Privacy Policy

*DISCLAIMER: Like all medical procedures, Regenexx® Procedures have a success and failure rate. Patient reviews and testimonials on this site should not be interpreted as a statement on the effectiveness of our treatments for anyone else.

Providers listed on the Regenexx website are for informational purposes only and are not a recommendation from Regenexx for a specific provider or a guarantee of the outcome of any treatment you receive.