Summary
Dr. TJ Williams hosts Dr. David Harshfield, chairman of the Institutional Review Board for the International Cellular Medicine Society, for a deep dive into platelet-rich plasma therapy. Dr. Harshfield explains how PRP works at a cellular level: platelets contain alpha and dense granules with instructions for tissue rebuilding, and when injected into a torn tendon, ligament, or joint, they signal the bone marrow to send the specific cells needed for repair. The episode covers Tiger Woods' famous PRP treatment, why NSAIDs and steroids can block the body's natural healing cascade, and the broad range of conditions PRP can address including musculoskeletal injuries, arthritis, and even macular degeneration research. Dr. Harshfield describes PRP as "hand grenade therapy" that lights up the immune system to deploy fibroblasts, macrophages, and other repair cells to the injection site.
Key Points
- PRP uses concentrated platelets from your own blood that contain alpha and dense granules with tissue rebuilding instructions
- When injected, PRP knows what tissue to build based on location - cruciate ligament in knee, rotator cuff in shoulder
- NSAIDs and steroids can block the body's natural healing cascade, preventing tissue regeneration
- PRP restarts the healing process even for injuries that occurred years ago - like a "time machine"
- Tiger Woods popularized PRP after getting it injected into his knee injury
- PRP has a multi-system effect - injecting one joint can sometimes improve symptoms in other areas
- The procedure takes under an hour: blood draw, 10-12 minute centrifuge spin, then injection
- PRP brings together multiple specialties in a patient-centered medicine approach
Key Moments
Platelets contain instructions for rebuilding the body in alpha and dense granules
Dr. Harshfield explains how platelets are concentrated from blood using a centrifuge and contain alpha and dense granules with instructions for tissue rebuilding. The platelets act like a GPS signal to bone marrow, directing specific repair cells to the injury site.
"You leave yourself this plasma component that looks like olive oil, but you spin that again, and on the very bottom of it, it's a little pellet of platelets, and it's very concentrated. And what we use, everyone knows that platelets are great for blood clotting and so forth. But in addition, and we didn't know that until just a few decades ago, those platelets actually have all the instructions on how to rebuild the body inside in these alpha-indensed granules."
PRP knows what tissue to build based on where it is injected
When PRP is injected into different tissues, it triggers the correct type of repair. Injected into a knee, it builds cruciate ligament tissue. Injected into a shoulder, it builds rotator cuff tissue. It can restart healing even years after the original injury.
"which I think is a much more consoling thought to a lot of our older folks in particular, in that I say, look, if we inject your knee and you need an anterior cruciate ligament repair and your body's not fixing it on its own and we're going to inject cells in your knee, the cells we're injecting are not going to fix your cruciate ligament. Your cells are."
PRP as hand grenade therapy that lights up the immune system
Dr. Harshfield describes PRP as "hand grenade therapy" - when platelets concentrate around an injured joint, they signal the bone marrow to send fibroblasts for collagen production, macrophages as cleanup crews, and other specific cells needed for repair.
"Think about it like hand grenade therapy. In other words, if you can get these platelets around an injured joint, it'll start the healing process, and it'll light up the immune system to go, okay, Balmira, I want some..."
