What Is the Difference Between PRP and Stem Cell Injections?

Two injections are marketed for the same sore knee, torn rotator cuff, or stubborn plantar fasciitis, and most people cannot tell them apart from the brochure. The short answer to what is the difference between prp and stem cell injections comes down to one thing: what is in the syringe. PRP is a concentrate of platelets from your own blood. A stem cell injection contains cells (usually from bone marrow or fat) that are meant to become new tissue. Everything else, from the evidence to the FDA’s position to the cost, follows from that single difference. This guide lays it out so you can walk into a Tulsa, Oklahoma clinic already knowing the right questions.

What PRP Injections Are and How They Work

PRP stands for platelet-rich plasma. A provider draws one to several tubes of your blood, spins them in a centrifuge, and separates out the platelets. According to the Hospital for Special Surgery, those platelets are concentrated to anywhere from 2 to 8 times their normal number and then mixed back into plasma for injection. Cleveland Clinic describes a similar result, noting that a PRP injection has five to 10 times as many platelets as a normal blood sample.

Platelets matter because they carry growth factors. When concentrated platelets are activated at the injury site, they release those growth factors and, as the HSS explains, stimulate the body to produce more of its own repair cells. PRP does not add new tissue. It sends a stronger signal to the tissue you already have.

Because the injection comes from your own blood, side effects are very limited, with only a remote risk of infection, according to HSS. Cleveland Clinic reports that swelling and soreness at the site typically last one to two days, that it can take a few weeks to see initial results, and that effects may last six months to one year. Cleveland Clinic also states plainly that research results are mixed and that while some people benefit from PRP, others do not.

What Stem Cell Injections Are and How They Differ

A stem cell injection uses a different source material. Instead of platelets, the provider collects cells that have the ability to develop into other tissue types. In orthopedic settings these are usually adult cells taken from the patient’s own bone marrow or fat. The American Academy of Orthopaedic Surgeons explains that mesenchymal stem cells are of special interest because they can become cartilage, muscle, fat, and bone, which are exactly the tissues that wear out in an arthritic joint or a chronically torn tendon.

That is the theoretical advantage. PRP signals; stem cells are meant to supply. In practice, the AAOS states that despite decades of research there is not yet strong evidence that stem cell treatments are effective, and that results in the literature remain mixed. The academy also notes that stem cell treatments are often not covered by insurance because of that limited evidence, so patients frequently pay out of pocket.

The federal picture is stricter still. The FDA states that the only stem cell products approved for use in the United States are blood-forming stem cells derived from umbilical cord blood, and those are approved for blood disorders, not orthopedic conditions. The same FDA page lists risks reported with unapproved products, including infections, unwanted immune reactions, and cells migrating to the wrong place. Same-day preparations of a patient’s own minimally processed cells fall under a lighter regulatory category, according to the AAOS, but that is a regulatory distinction, not proof of benefit. Any honest provider in Tulsa, Oklahoma should be able to tell you exactly what product is being injected, where it came from, and how it is regulated.

PRP vs Stem Cell Injections Side by Side

The differences are easier to see in one place. Every figure below is repeated in the surrounding text with its source.

On source material, PRP comes from your own blood drawn the same day, while stem cells usually come from your own bone marrow or fat. On what is injected, PRP delivers platelets concentrated 2 to 8 times normal according to HSS, while a stem cell injection delivers cells that the AAOS says can become cartilage, muscle, fat, and bone.

On procedure time, Cleveland Clinic describes the full PRP process, including the blood draw and spin, as taking about one hour, and at Care Family Chiropractic the regenerative procedure itself takes about 15 to 20 minutes for either PRP or stem cell injections. On evidence, PRP results are mixed but improving, and HSS reports recent data showing PRP is superior to hyaluronic acid injections for knee osteoarthritis. Stem cell injections do not yet have strong evidence according to the AAOS and are not FDA approved for orthopedic use. On typical use, PRP is most often chosen for tendon injuries and mild to moderate knee arthritis, while stem cells are used for arthritis, cartilage and ligament injuries and are marketed for more advanced wear. On downtime, Cleveland Clinic reports soreness for one to two days after PRP, and Care Family Chiropractic reports patients return to normal activity right after either procedure.

Not sure which injection fits your injury? Book a complimentary consultation at Care Family Chiropractic in Tulsa.

What the Research Says When the Two Are Compared Directly

Head-to-head data is thinner than the marketing suggests, but it is not absent. A 2024 umbrella review in the Annals of Saudi Medicine pooled 28 meta-analyses covering 32,763 participants with knee osteoarthritis. The authors found that both mesenchymal stem cell therapy and PRP therapy were significantly associated with improved knee osteoarthritis scores, including pain and function measures such as the WOMAC index. That umbrella review is useful because it settles contradictions among earlier reviews rather than adding one more small trial to the pile.

What the review does not do is crown a winner. Both helped. Neither is described as a cure, and neither replaces a joint that is bone on bone. For many patients in Tulsa, Oklahoma, the practical reading is that PRP is the lower-cost, better-studied first step for tendon problems and early to moderate arthritis, and stem cell injections are a conversation to have when PRP has been tried or the damage involves cartilage and ligament tissue.

Cost belongs in that conversation too. This post does not quote clinic prices because they depend on the joint, the number of injections, and your individual plan. What can be said from published sources is that the AAOS notes stem cell treatments are often not covered by insurance, and Cleveland Clinic notes that PRP carries a significant cost because each dose is prepared individually. Ask for the total in writing before either procedure.

So What Is the Difference Between PRP and Stem Cell Injections for Your Injury?

Start with the tissue, not the technology. A chronic tendon problem such as Achilles tendonitis, plantar fasciitis, or a partial rotator cuff tear has the longest track record with PRP. A worn joint with cartilage loss is where stem cell injections are usually proposed, but the evidence gap means you should expect an honest “may help” rather than a promise.

Next, ask about the whole plan. Injections work best when the soft tissue around the joint is also treated. At Care Family Chiropractic the regenerative program sits alongside spinal adjustments, manual therapy, trigger point therapy, pressure wave therapy, and corrective exercises, so an injection is one part of recovery rather than the entire strategy. That matters because soft tissue healing depends on movement and load management in the weeks after any injection.

Finally, ask the FDA’s questions. What exactly is the product, where did it come from, and is it your own tissue prepared the same day? Is the provider a licensed physician with pain management credentials? Are you being told the honest state of the evidence? A clinic that answers those without flinching is the clinic to work with.

Why Choose Care Family Chiropractic

Both PRP and stem cell injections are offered at the same Tulsa, Oklahoma location, which means the recommendation can be driven by your injury rather than by which single product a clinic happens to sell. If a tendon looks like a PRP case, that is what gets recommended. If the picture calls for something else, or for no injection at all, that is what you hear.

The regenerative procedure at Care Family Chiropractic takes about 15 to 20 minutes, and patients return to normal activity right after. Conditions treated include plantar fasciitis, Achilles tendonitis, rotator cuff injuries, arthritis, and ligament and cartilage injuries. Care is overseen by Dr. Curtis Smith, who is board certified by the American Academy of Pain Management, with a Medical Director on staff for injections and nerve conduction studies when diagnosis needs them.

The stated goal of the practice is resolving pain without surgery or drugs, and treating the whole person rather than the symptom. That goal shapes how injections are used here: as one tool in a plan that also includes adjustments, soft tissue rehab, and home care, for patients from Tulsa, Broken Arrow, Bixby, Owasso, and Jenks.

Conclusion

The difference between PRP and stem cell injections is the material: concentrated platelets from your blood versus cells from bone marrow or fat that are meant to become new tissue. PRP has the stronger published record, especially for tendons and early knee arthritis, and carries very limited side effects because it is your own blood. Stem cell injections have a larger theoretical upside, weaker evidence so far, and no FDA approval for orthopedic use, so they deserve harder questions and a written cost. Either way, the injection should be one piece of a plan that also rebuilds the tissue around the joint.

Ready to get a straight answer about your knee, shoulder, or heel? Schedule a free consultation with Care Family Chiropractic to book your complimentary first visit.

Frequently Asked Questions

Which is better, PRP or stem cells?

Neither is better for every problem. PRP has more published evidence, especially for chronic tendon injuries and mild to moderate knee arthritis, and it carries very few side effects because it comes from your own blood. Stem cell injections are proposed for more advanced cartilage damage, but the evidence is still developing and no stem cell product is FDA approved for orthopedic conditions.

How do I choose between PRP and stem cell therapy?

Base the decision on the tissue involved, the severity of damage, the evidence for that specific condition, and the total cost. Tendon problems usually point toward PRP first. Ask any provider what exactly is in the syringe and how it is regulated before you commit.

Can PRP and stem cell therapy be combined?

Some providers inject PRP alongside stem cells on the theory that platelet growth factors support the injected cells. Published reviews have looked at combinations for knee osteoarthritis, but results vary and there is no standard protocol. Treat a combined approach as still experimental.

How long do PRP injections last in the knee?

Relief often begins within a few weeks and may last six months to a year for many patients. Some studies report benefits fading by two years, and repeat injections are sometimes used.

Is stem cell therapy or a PRP injection for rotator cuff pain proven to be effective?

PRP has moderate support for partial rotator cuff tears and tendinopathy, though studies are mixed. Stem cell injections for the rotator cuff have less evidence and are not FDA approved for that use. Neither is proven for full-thickness tears that may need surgical repair.