Stem cell surgery is a broad term covering medical procedures that use stem cells to repair, replace, or regenerate damaged tissues in the body. Some of these procedures are well-established, like bone marrow transplants for blood cancers. Others, particularly injections marketed for joint pain or anti-aging, remain largely unproven. Understanding the difference is important because the term “stem cell surgery” gets used to describe treatments at very different levels of scientific evidence.
How Stem Cells Work
Stem cells have two properties that make them useful in medicine. They can copy themselves indefinitely (self-renewal), and they can transform into specialized cell types like heart muscle cells, blood cells, or nerve cells. This transformation process is called differentiation. Your body already uses stem cells to maintain and repair tissue after injury, but medical procedures aim to concentrate or redirect that repair ability toward a specific problem.
In a therapeutic setting, stem cells are either harvested from your own body, taken from a donor, or grown in a lab. They’re then delivered to the site of damage, where they can develop into the type of cell that’s needed. The goal is to jumpstart healing that the body can’t accomplish on its own.
Where Stem Cells Come From
Most stem cell procedures use cells from one of three sources: bone marrow, fat tissue, or donated cord blood. Each has a different harvesting process and different strengths.
- Bone marrow: Stem cells are drawn from the pelvic bone using a needle, then spun in a centrifuge to concentrate them. This typically requires general anesthesia and some time to process the cells before use.
- Fat (adipose) tissue: A small liposuction procedure removes roughly 25 to 50 cc of fat, usually under local anesthesia. These cells can be used without additional processing time.
- Cord blood: Collected from umbilical cords after birth, cord blood stem cells come from donors and are stored in blood banks. Several cord blood products are FDA-licensed for transplant use.
When stem cells come from your own body, the procedure is called autologous. When they come from a donor, it’s called allogeneic. This distinction matters because donor cells carry a risk your own cells don’t: your immune system may attack the foreign tissue, a complication known as graft-versus-host disease. On the other hand, donor cells can sometimes recognize and attack remaining cancer cells in ways your own cells cannot.
Conditions Currently Treated
The most established use of stem cell therapy is bone marrow transplantation for blood cancers and blood disorders. Autologous transplants (using your own cells) are commonly used for leukemias, lymphomas, and multiple myeloma. Allogeneic transplants (using donor cells) treat those same cancers plus conditions like aplastic anemia and myelodysplastic syndromes. Auto transplants are also used for some autoimmune conditions, including multiple sclerosis, Crohn’s disease, and lupus.
Beyond cancer, the FDA has approved cell-based therapies for a growing list of conditions. These include gene therapies for sickle cell disease, treatments for certain inherited vision disorders, therapies for spinal muscular atrophy in children, and a product that uses your own cartilage cells to repair knee damage. In total, dozens of cellular and gene therapy products now hold FDA approval.
Then there’s a separate, much larger market of clinics offering stem cell injections for orthopedic injuries, back pain, neuropathy, and cosmetic purposes. These treatments are widely advertised but mostly lack FDA approval, and the evidence supporting them varies significantly.
What FDA Approval Actually Means Here
This is where the landscape gets confusing. The FDA has approved specific stem cell and cell-based products that have gone through clinical trials proving they’re safe and effective. Bone marrow transplants for cancer, cord blood products, and newer gene therapies all fall into this category.
However, the vast majority of clinics advertising “stem cell therapy” for joint pain, aging, or sports injuries are offering procedures that have not gone through this approval process. That doesn’t automatically mean they’re dangerous, but it does mean their safety and effectiveness haven’t been verified through rigorous testing. The FDA has warned that injecting even a person’s own tissue into a different body part has resulted in severe illness and, in some cases, blindness.
Costs and Insurance Coverage
The price of stem cell procedures varies enormously depending on what’s being treated. Stem cell injections for knees typically cost between $5,000 and $10,000. Back and shoulder treatments range from $5,000 to $15,000. Treatments for vision loss start around $20,000 and go higher. The average cost across procedure types is roughly $10,000, though prices have been climbing.
Insurance generally does not cover unproven stem cell treatments. If a clinic is offering injections for joint pain or neuropathy, you’ll almost certainly pay out of pocket. Medicare does cover established bone marrow transplants for cancer, but it will not cover experimental or unapproven stem cell procedures. If cost is a concern, asking whether a specific treatment has FDA approval is a practical first step, since that’s the dividing line most insurers use.
Recovery After a Stem Cell Procedure
Recovery depends entirely on which type of procedure you’re having. For outpatient stem cell injections (the kind offered at orthopedic or regenerative medicine clinics), most people return to normal activity within a few days, though full results may take weeks or months to appear.
Bone marrow transplants are a completely different experience. The first 30 days after transplant are the engraftment period, when donated cells begin growing and producing new blood cells. During days 30 through 100, the medical team monitors closely for infection and complications like graft-versus-host disease. Some patients can transition to outpatient care within the first 100 days, but full recovery often takes much longer, sometimes a year or more.
Risks to Be Aware Of
For FDA-approved stem cell transplants, the risks are well-documented and managed by experienced medical teams. Infection is a major concern because the immune system is suppressed before transplant. Graft-versus-host disease is a significant risk with donor cells, where the new immune cells attack healthy tissue. There’s also the possibility that a transplant simply doesn’t engraft, or that cancer cells survive the process.
For unapproved procedures, the risks are harder to quantify precisely because the treatments haven’t been studied as thoroughly. Reported complications from unregulated clinics include infections at injection sites, abnormal tissue growth, and cases where cells migrated to unintended areas. The concern isn’t just that these treatments might not work. It’s that without proper oversight, complications may not be managed by a qualified care team. If you’re considering a stem cell procedure outside of a major medical center, asking whether the treatment is FDA-approved and whether the clinic is part of a registered clinical trial are two questions worth asking before anything else.