Stem Cells in the Treatment of Knee Anterior Cruciate Ligament Injuries
Treatments By body area Knee & joints Spine, neck & back Hip Shoulder By condition Autoimmune & inflammatory Neurological Diabetes Anti-aging & vitality Every treatment uses the same Passage 3 protocol. View all treatments How it works Your journey Testimonials Pricing About The center The company The stem cells Facilities People & place Dr. Diana Reyes The team About Medellín ENES Book your consultation Message us Treatments + By body area Knee & joints Spine, neck & back Hip Shoulder By condition Autoimmune & inflammatory Neurological Diabetes Anti-aging & vitality View all treatments → How it works Your journey Testimonials Pricing About + The company The stem cells Dr. Diana Reyes The team Facilities About Medellín ENES Book your consultation Message us on WhatsApp Blog · Knee ligaments Knee ligaments ACL injuries and stem cells: what the science shows Torn or strained ACL? How the ligament heals, where surgery fits, and what research on mesenchymal stem cells has found so far. 5 min readReviewed with the medical team of Stem Cells Colombia The 30-second version The ACL heals poorly on its own because it floats in joint fluid with little blood supply. A specialist reads your MRI first, so your plan fits your knee: reconstruction, cells, or both. Stem cells are studied to support ligament and graft healing, and studies have shown stronger, more mature grafts. It usually happens in a split second. You plant your foot, turn, and hear a pop. The knee swells by evening, and the next few weeks are a crash course in words like ACL, graft and reconstruction. Or maybe it happened years ago, and the knee has felt a little different ever since. Either way, you have probably read that stem cells could help. Here is what the research has shown, in plain words. What does the ACL actually do? The anterior cruciate ligament is a short, strong band in the middle of your knee. It stops your shinbone from sliding forward and keeps the knee steady when you twist, cut or land. Think of it as the seatbelt of the knee. You don’t notice it on a straight road; you notice it the moment you swerve. Most ACL injuries happen without any contact: a sudden stop, a quick change of direction, an awkward landing. Soccer, skiing and basketball are the usual suspects. The typical signs are a pop, fast swelling and a knee that feels loose or gives way when you turn. In plain wordsACL anterior cruciate ligament, the band that keeps the knee stable when you twist Why does it heal so poorly? Most tissues heal with the help of a blood clot and a good blood supply. The ACL sits inside the joint, bathed in joint fluid, with a modest blood supply. When it tears, the ends often cannot find each other again. That is why a complete tear in a knee that keeps giving way is usually treated with reconstruction surgery, where a tendon graft replaces the ligament. A partial tear or a sprain in a stable knee may do well with rehabilitation alone. Where do stem cells come in? Mesenchymal stem cells are studied for the signals they release. In an injured knee, those signals may calm inflammation and support the cells that rebuild ligament and cartilage tissue. Researchers look at them in three situations: Partial tears and sprains, to support the ligament’s own healing After reconstruction, to help the graft mature into ligament-like tissue, a process called ligamentization The rest of the knee: an old ACL injury often brings cartilage wear and early arthritis later In plain wordsLigamentization the slow change of a tendon graft into tissue that behaves like a ligament What has the research found? A 2022 systematic review of controlled animal studies found that stem cell therapy made reconstructed ACL grafts stronger and more mature under the microscope. A 2026 systematic review added early human studies: in 14 studies, 10 of them in animals, stem cells improved graft strength and healing, and the first safety signals in people looked reassuring. The authors called for larger trials to build on these results. MythStem cells regrow a torn ACL so you can skip surgery. Reality: For a complete tear in an unstable knee, reconstruction comes first. The cells are studied to support healing: the ligament, the graft and the rest of the knee. So what should you do with your knee? Start with a good diagnosis: an exam for stability and an MRI. If the knee is unstable and you want to return to pivoting sports, see an orthopedic surgeon; reconstruction has a long track record. If the tear is partial, the surgery is behind you, or the old injury has turned into pain and wear, a regenerative option is worth a free evaluation. Just skip the part where you diagnose yourself on a sports forum at midnight. What this means for you Get an MRI and a stability exam before choosing any treatment. If your knee gives way, your specialist checks whether reconstruction should come first, so your plan is designed for you. For partial tears, post-surgery recovery or old injuries turned painful, send your MRI for a free evaluation of your regenerative options. Where the evidence stands Lab & animal studiesFirst human studiesSeveral clinical trialsStandard of care Animal studies consistently show that mesenchymal stem cells can improve ligament and graft healing after ACL injury. The first human studies show reassuring safety signals, and larger trials are the next step. Research is growing, and the results so far are promising. Efficacy of Stem Cell Therapy for Tendon Graft Ligamentization After Anterior Cruciate Ligament Reconstruction: A Systematic Review · Orthopaedic Journal of Sports Medicine, 2022 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 Bring your case How the doctors do it in Medellín Send your MRI on WhatsApp: Dr. Felipe Salgado takes your history, reads it with