Procedure day is a series of careful checks

The visit starts with another joint check

The clinic won't skip another joint check. What the exam shows may change the procedure.

Carry a written list of every medicine. Take your earlier X-rays and scans along.

Don't stop prescribed medicine on your own. Your regular doctor and the clinic doctor must agree first.

Tell the clinic about fever or a new illness. You may need to move the appointment.

Ask where each needle will go. You'll know what will happen before the clinic begins.

The blood draw and marrow draw feel different

PRP, short for platelet-rich plasma, is pale blood liquid with extra platelets, tiny pieces that help clots form. The clinic gets it by drawing and spinning your blood.

A marrow draw uses the back of your pelvis. Local anesthetic is numbing medicine put on one area.

That medicine may not remove all pressure. Your pelvis and treated joint may both feel sore.

Ask which clinic worker performs each step. Ask if live X-ray or ultrasound helps aim the needle.

Live X-ray or ultrasound shows the needle's position. Don't be shy about asking what you'll feel.

Written directions make the trip home safer

Before leaving, check the bandage on your joint. Also check the bandage over the pelvis draw.

Ask about driving, bathing, and easy movement. Sleepy-making medicine may mean you'll need a driver.

Fever, spreading redness, or leaking fluid needs a call. Fast swelling or new weakness can't wait.

Your joint may stiffen during the ride. Don't sit longer than the clinic's written directions allow.

Set out loose clothes before leaving home. Keep your driver's number and the clinic number handy.

Sources

1. A retrospective comparison of 523 bone marrow aspiration procedures against 435 open iliac crest bone graft harvests found aspiration significantly reduced complications - relevant because marrow aspiration for a joint injection is a real procedure with a real, if low, complication rate.

   Hernigou P, et al. — Morbidity of graft harvesting versus bone marrow aspiration in cell regenerative therapy. Int Orthop, 2014. DOI: 10.1007/s00264-014-2318-x.

2. In 96 patients, concentrated bone marrow aspirate contained a mean of 26.3 million nucleated cells per mL but only about 1,422 colony-forming units of connective tissue progenitors, and the nucleated cell count had negligible predictive value for how many progenitor cells were actually present (r-squared 0.28).

   Muench LN, et al. — Nucleated Cell Count Has Negligible Predictive Value for the Number of Colony-Forming Units for Connective Tissue Progenitor Cells (Stem Cells) in Bone Marrow Aspirate Harvested From the Proximal Humerus During Arthroscopic Rotator Cuff Repair. Arthroscopy, 2021. DOI: 10.1016/j.arthro.2021.01.064.

3. Mesenchymal stromal cells make up only about 0.001 to 0.01 percent of the nucleated cells in bone marrow, so the harvesting and processing technique - aspiration site, syringe size, centrifuge speed and time - materially determines what ends up in the syringe, and no consensus protocol exists.

   Jeyaraman M, et al. — Impact of the Process Variables on the Yield of Mesenchymal Stromal Cells from Bone Marrow Aspirate Concentrate. Bioengineering (Basel), 2022. DOI: 10.3390/bioengineering9020057.

4. In a Level I randomized trial of arthroscopic rotator cuff repair, augmenting the repair with concentrated bone marrow aspirate was compared against a sham incision with MRI assessment of structural healing at one year - the rare cell-therapy question asked with a proper blinded control.

   Cole BJ, et al. — Prospective Randomized Trial of Biologic Augmentation With Bone Marrow Aspirate Concentrate in Patients Undergoing Arthroscopic Rotator Cuff Repair. Am J Sports Med, 2023. DOI: 10.1177/03635465231154601.

5. A phase I single-arm study of 10 patients with chronic discogenic low back pain found a single intradiscal injection of adipose-derived MSCs with hyaluronic acid produced no procedure-related or cell-related adverse events over 12 months - a safety signal in 10 people, not an efficacy result.

   Kumar H, et al. — Safety and tolerability of intradiscal implantation of combined autologous adipose-derived mesenchymal stem cells and hyaluronic acid in patients with chronic discogenic low back pain: 1-year follow-up of a phase I study. Stem Cell Res Ther, 2017. DOI: 10.1186/s13287-017-0710-3.

6. A randomized trial comparing commercially available systems in 71 patients found microfragmented adipose tissue equivalent to leukocyte-rich PRP on KOOS pain at 12 months.

   Baria M, et al. — Microfragmented Adipose Tissue Is Equivalent to Platelet-Rich Plasma for Knee Osteoarthritis at 12 Months Posttreatment: A Randomized Controlled Trial. Orthop J Sports Med, 2024. DOI: 10.1177/23259671241233916.

7. In a randomized trial of 118 knee osteoarthritis patients followed for 2 years with serial MRI, a single microfragmented adipose tissue injection and a single PRP injection produced statistically and clinically similar improvement - and the imaging showed no structural advantage for either.

   Zaffagnini S, et al. — Microfragmented Adipose Tissue Versus Platelet-Rich Plasma for the Treatment of Knee Osteoarthritis: A Prospective Randomized Controlled Trial at 2-Year Follow-up. Am J Sports Med, 2022. DOI: 10.1177/03635465221115821.