Stem cell injections use concentrated cells, usually taken from your own bone marrow or fat. They’re then injected into a painful joint or delivered through a vein. Many readers come to our guides knowing the price but little about what the appointment actually involves. The procedure itself is brief and outpatient. The outcome, however, is much less certain than the booking process might suggest.
What Goes into the Syringe
A stem cell injection contains a concentrate of your own tissue. It is not a purified dose of stem cells. A clinic draws bone marrow from your pelvis and spins it down to produce bone marrow aspirate concentrate. That concentrate is mostly red and white blood cells and platelets, with a small fraction of mesenchymal stem cells. Those stem cells are typically a fraction of a percent of what ends up in the needle.
Three sources dominate what clinics offer, and they change both the appointment and the price.
- Bone marrow (BMAC). Drawn from the back of your pelvis the same day, processed in a centrifuge for about 30 minutes, then injected. Your own cells, so no donor screening is involved.
- Adipose (fat) tissue. Removed by a small liposuction, usually from the abdomen or flank, then processed. Also same-day and autologous, meaning it comes from your body.
- Umbilical cord or amniotic products. Donor material processed by an outside lab and shipped frozen. No harvest appointment, which is why these visits are short, and the cells are not yours.
Clinics rarely tell you the cell count. Ask for it in writing before you pay, then look the clinic up in the FDA’s tissue establishment registration database. A clinic that cannot state how many viable cells it is injecting has quoted you a volume and called it a dose.
What the Appointment Involves, Step by Step
A same-day autologous injection runs two to four hours from arrival to discharge. Patients find the harvest harder than the shot itself.
- Intake and imaging. The clinician confirms the target joint, sometimes with a fresh ultrasound or an existing MRI.
- The harvest. For bone marrow, you lie face down while a needle enters the iliac crest at the back of your pelvis under local anesthetic. Most people describe a deep aching pull for 10 to 30 seconds. For fat, a small liposuction under local anesthetic takes 20 to 30 minutes.
- Processing. The sample goes into a centrifuge for about 30 minutes to concentrate the cellular fraction. You wait in the room.
- The injection. The concentrate goes into the joint, often guided by ultrasound or fluoroscopy so the clinician can see the needle reach the target. This part takes a few minutes.
- Discharge. You walk out the same day. Most clinics ask you to arrange a ride home if you had sedation.
A donor-product injection skips steps two and three entirely and takes under an hour. The shorter appointment is not a discount on the same treatment. Donor material comes from someone else’s tissue and sits under a different part of the FDA’s rules, which our FDA status guide sets out.
Injection into a Joint versus Infusion into a Vein
The two delivery routes are sold under one name and carry very different justifications. A joint injection places the concentrate where it is meant to act, which is at least biologically coherent even where the outcome data is weak. An intravenous infusion sends cells into the bloodstream instead, and our MSC guide covers what happens to them there.
An infusion cannot deliver a targeted dose to one knee. When a clinic proposes one for a localized orthopedic complaint, ask why the route changed, because the usual reason is that infusions are easier to sell as a package.
How Often Clinics Repeat It
Most clinics propose a repeat at 6 to 12 months, and many sell a three-injection course before you have had the first one. No published trial has established a correct interval or shown that a second injection adds benefit over a first. The schedule comes from business practice.
We see readers treat the course as a clinical protocol and pay upfront for all three. If a clinic quotes a multi-injection package before knowing how you respond to one, ask what observed result would cause them to recommend stopping. A provider who cannot name that result has no stopping rule, which means the course was never conditional on your outcome. Our guide on how long the effect lasts covers what the follow-up data does and does not show.
Recovery in Brief
Expect soreness at both sites for three to seven days. Avoid heavy loading of the joint for about two weeks. Most clinics discourage anti-inflammatory drugs immediately afterward, on the theory that inflammation is part of the intended response, though that instruction rests on reasoning rather than trial evidence. Our safety and side effects guide covers the warning signs that warrant a call, including infection and persistent swelling.
Who Should Not Get One
Anyone with a bone-on-bone joint is a poor candidate, because no injection has been shown to rebuild cartilage that is already gone. Clinics also screen out people with an active infection or fever, an active cancer diagnosis, or a pregnancy. A bleeding disorder or blood-thinning medication can rule out the marrow draw until a doctor clears you. If you have not tried physical therapy or a corticosteroid injection, start there. Insurance covers both, and both rest on a far larger base of controlled trials, as the National Institute of Arthritis and Musculoskeletal and Skin Diseases sets out for knee osteoarthritis.
What Would Change This Advice
A cell product winning FDA approval for a specific joint condition would change it, and studies are registered and recruiting on ClinicalTrials.gov. So would a large, blinded, multi-year trial showing benefit that outlasts the placebo response. Until one of those lands, you are paying out of pocket for low-certainty evidence, at $3,000 to $8,000 for a knee and $4,000 to $9,000 for a hip, per our injection cost guide.
Before You Book
Get three things in writing: the cell source, the viable cell count, and the total price including imaging and follow-up visits. Then price the same joint against physical therapy and a cortisone injection using our cost guide, and ask the clinic which published trial supports stem cell injections for your exact condition. If you’re still deciding where to go, our guide to finding a clinic near you covers what to check before you book.
Frequently asked questions
What are stem cell injections used for?
Clinics most often inject them into knees, hips, shoulders, and the lower back for osteoarthritis and tendon pain. Some also sell intravenous infusions for autism, multiple sclerosis, neuropathy, and anti-aging. The FDA has approved none of these uses, and the joint evidence rests on small trials that a Cochrane review rated low to very low certainty.
How painful is a stem cell injection?
The bone marrow draw is the part patients report as genuinely painful, a deep aching pressure for 10 to 30 seconds while the needle is in the pelvis, even with local anesthetic. The joint injection itself feels like a large cortisone shot. Soreness at both sites for a few days afterward is common.
How long does a stem cell injection appointment take?
Plan on two to four hours for a same-day procedure using your own cells, since the harvest, the processing, and the injection all happen in one visit. A donor-cell or umbilical-product injection takes under an hour because the lab work happened elsewhere.
How often do you need stem cell injections?
Clinics commonly propose a repeat at 6 to 12 months, and some sell a course of three or more upfront. No trial has established a correct interval, so a repeat schedule quoted before your first injection is a sales structure rather than a clinical finding. Ask what result would tell you not to repeat it.
Do stem cell injections work?
For knee osteoarthritis, the best controlled evidence shows at most a slight edge over placebo on low-certainty data. For most other advertised uses there is no controlled evidence at all. Some patients report months of reduced pain, which may come from the anti-inflammatory signaling rather than any repair of the joint.
Medical disclaimer. Medical Frontier is an independent educational resource. This page is for general information only and is not medical advice, diagnosis, or treatment, and does not create a doctor–patient relationship. Most regenerative therapies discussed here are not FDA-approved for the uses described and may be offered under limited exemptions or in clinical trials only. Always consult a licensed physician before making any treatment decision.