- Ligaments have little blood flow, so they often heal slowly and with weaker scar tissue.
- Stem cells are studied for calming inflammation and supporting better-organized repair.
- Studies have shown stronger, better-healed grafts, and the first human studies show promising safety.
A sprained ankle that “never felt the same.” A knee that gives way on stairs. A partial tear that was supposed to settle in six weeks and is now celebrating its first birthday. Ligament injuries have a way of overstaying their welcome.
There is a biological reason for that, and it is also why regenerative medicine has taken an interest in ligaments. Here is what happens when a ligament is injured, what stem cells are studied for, and what the evidence shows today.
Why are ligaments so slow to heal?
Ligaments are the strong bands that tie bone to bone and keep a joint stable. They are made mostly of collagen fibers, lined up like the strands of a rope, with relatively few cells and a poor blood supply.
Less blood means fewer nutrients and fewer repair cells arriving at the injury. Healing is slow, and it often ends in scar tissue: collagen laid down in a messier pattern, like a rope repaired with a knot. It holds, but it can be weaker and more prone to another injury. That is also why the second sprain in the same ankle so often arrives with less warning than the first.
What do the usual treatments do?
Rest, bracing and physical therapy protect the joint and rebuild the muscles around it. For complete tears, such as many ACL ruptures in active people, surgical reconstruction replaces the ligament with a graft.
These approaches mainly restore mechanical stability. They don’t directly change the biology of the healing tissue, and that is the gap regenerative medicine is trying to fill.
What might stem cells add?
Mesenchymal stem cells are sometimes described as a “drugstore” that sets up shop at the injury. They mainly act by releasing signals, growth factors and small messengers, that may:
- Calm lingering inflammation around the injury
- Encourage the ligament’s own repair cells to work
- Support more organized collagen instead of disordered scar
- Support the growth of small blood vessels that feed the tissue
Stem Cells Colombia uses only mesenchymal stem cells from Wharton’s jelly, the soft tissue of the umbilical cord. They come from a donated cord after a healthy birth, so nothing is harvested from your own body.
Which injuries are studied the most?
Two situations come up again and again:
- Partial tears, chronic sprains and loose ligaments, where surgery is not clearly needed. Here cells are placed in or around the ligament under ultrasound guidance, aiming to calm inflammation and support healing.
- Help for a surgical repair, such as an ACL reconstruction. In animal studies, adding stem cells improved how well the graft matured and how much load it could take before failing.
For a completely ruptured ligament with an unstable joint, your specialist reviews whether surgery should come first, so your plan is designed for you.
What does the evidence show in people?
Animal studies are consistent and encouraging: in a 2026 review, adding stem cells made ACL grafts clearly stronger at the point of failure, and the first human studies showed promising early safety. Research is growing, and larger studies are the next step to measure how people feel and function.
Your specialist looks at your imaging first and explains what you can expect for your injury, so your plan is designed for you.
- For a new sprain, protect the joint and start physical therapy; many heal well that way.
- If a partial tear or chronic sprain keeps bothering you after months, send your MRI for a free evaluation.
- For a complete tear with an unstable joint, your specialist tells you whether surgery comes first and how cells can support your recovery.
A 2026 systematic review of 14 animal and early human studies found that stem cells improved graft maturation and strength after ACL reconstruction in animals, with promising early safety signals in people; research is growing. The idea of cells as an injury-site “drugstore” comes from a widely cited 2011 paper on how these cells act.
- The MSC: an injury drugstore · Cell Stem Cell, 2011
- The Effect of Stem Cell-Based Therapies on Tendon Graft Healing and Ligamentization after Anterior Cruciate Ligament Reconstruction: A Systematic Review · Current Stem Cell Research & Therapy, 2026
Questions
Can stem cells help a partial ACL tear?
Partial tears are one of the situations where cells are studied, aiming to calm inflammation and support healing. A specialist reviews your MRI to see whether your tear is a good fit. An ACL injury is treated as a knee, starting from $1,999.
Do I still need physical therapy?
Yes. Rebuilding strength and control around the joint matters whatever else you do.
When would I notice a change?
Every body responds at its own pace; change builds gradually, and improvement is usually expected at 4–6 months.
Why no anti-inflammatories afterwards?
The doctors ask you to avoid them after the application so the cells can work on their own. Your doctor tells you what you can take for discomfort.
Is it approved by the FDA?
Stem cell therapy is not approved by the FDA, but in Colombia it is legal.