Using Stem Cells in an Elite Track Athlete: Regenexx Patient Cydonie Mothersill wins Cayman Invitational

By /

Can stem cells be used as a running stress fracture treatment in an elite track athlete? Cydonie Mothersill is an elite track athlete and gold medalist at the 2010 Commonwealth games, 2010 Mayaguez, and CARIFTA games. After her great performance at the Commonwealth Games in 2010, she was within striking range of a medal in the 200M at the London Olympics.

The Cayman government wanted us to see Cydonie at Regenexx Cayman to keep her running. She initially presented to us with a non-healing tibial stress fracture, Achilles tendonitis, and a hip labrum tear. Any of these injuries could have been career ending for an elite runner. The difficulties in treating Cydonie were the same as with any elite athlete; all of her non-invasive treatment had to be fit in and around her high level running and training. However, had Cydonie gone the traditional orthopedic surgery route, her surgical hip labrum repair and bone grafting, or fixation for the stress fracture (or being off training for 6 months) would have taken her out of an entire season. While for a younger runner, losing a season to heal multiple injuries might have been chalked up to experience; at 32 with her last Olympics looming, this wasn’t an option for Cydonie.

Instead, we went to work using a Regenexx-SD stem cell injection treatment for her hip and tibial stress fracture and followed that up with Regenexx-C treatments. Can a running stress fracture be treated with stem cells? We’ve demonstrated proof of concept by publishing a case series of non-healing fractures that we treated successfully only with an injection of stem cells. We’ve also posted many cases showing that we can help the hip labrum heal through a very precise injection of the patient’s own stem cells into the labral tear. Within a few weeks, the pain and swelling from the tibial stress fracture began to subside and the hip pain was gone. I then saw her again in March. By that time her biggest ongoing issue was the Achilles area, which was reinjected along with her back (Regenexx-PL-Disc). By the March visit, the only thing that made the tibial stress fracture hurt was decelerating after a race. Since all of this had been accomplished with injections instead of surgery, she was still able to train hard. As a testament to her perseverance and this unique medical treatment plan, she recently won the 200M in the recent Cayman Invitational!

We’re proud to have helped Cydonie avoid career ending surgery by using her own stem cells in a stem cell running stress fracture treatment, and hip and disc treatments, and hope that she continues to use her unique drive and spirit to run her race. Next stop-London Olympics!

NOTE:  Regenexx-C and Regenexx-SD are medical treatments and like all medical treatments have a success and failure rate.  Not all Regenexx-C and Regenexx-SD patients can expect the same result.

Learn about Regenexx procedures for foot & ankle conditions.
Chris Centeno, MD is a specialist in regenerative medicine and the new field of Interventional Orthopedics. Centeno pioneered orthopedic stem cell procedures in 2005 and is responsible for a large amount of the published research on stem cell use for orthopedic applications. View Profile

If you have questions or comments about this blog post, please email us at [email protected]

NOTE: 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

We do not sell, or share your information to third party vendors.

By submitting the form you agree that you’ve read and consent to our Privacy Policy. We may use email, phone, or other electronic means to communicate information about Regenexx.

We will provide information to help you decide whether you want to schedule an evaluation with a Regenexx Physician.

Insurance typically covers evaluations and diagnostic testing (if recommended). Most insurance plans currently do not cover Regenexx Procedures.

Copyright © Regenexx 2021. All rights reserved.



9035 Wadsworth Pkwy #1000
Westminster, CO 80021


*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.