Jorge DdMF et al. — The Mechanism of Action between Pulsed Radiofrequency and Orthobiologics: Is There a Synergistic Effect?
International Journal of Molecular Sciences, October 2022
This Brazilian review paper explores whether combining PRF with orthobiologics — primarily PRP, but also bone marrow aspirate and adipose tissue-derived products — could produce synergistic therapeutic effects beyond what either approach achieves alone.
PRF mechanisms reviewed: The paper consolidates the known mechanisms of PRF action, including reduction of pro-inflammatory cytokines (IL-1, IL-6, TNF-α, IFN-γ), increased intracellular Ca²⁺ via mild electroporation, modulation of gene expression along nociceptive pathways, inhibition of extracellular signal-regulated kinases, and free radical reduction via the radical pair mechanism — directly referencing the Brasil et al. (2020) and Sluijter et al. (2023) work.
Orthobiologics reviewed: PRP, bone marrow aspirate concentrate (BMAC), and stromal vascular fraction (SVF) all share key properties: growth factor delivery, endogenous repair stimulation, analgesia, and immunomodulation — making them mechanistically compatible with PRF.
BDNF as a connecting molecule: A notable focus is Brain-Derived Neurotrophic Factor (BDNF), present in platelet alpha-granules at concentrations roughly 100 times higher than in neurons. The authors hypothesize that PRF's modulation of BDNF response — via TrkB receptor activation — could help prevent exaggerated inflammatory responses sometimes triggered by orthobiologics, while simultaneously stimulating neuroplasticity and neural tissue regeneration.
Key findings:
- PRF + PRP for knee osteoarthritis: significant pain reduction and improved mobility vs. either alone
- PRF + PRP for supraspinatus injury: improved Constant-Murley shoulder scores maintained at 6 months
- PRF + hyaluronic acid for knee OA: 88.6% mobility improvement, sustained at 12 months
- Aesthetic applications: RF + PRP for neck laxity and stretch marks showed promising results
Significance: This review positions PRF as a natural partner technology in the rapidly growing regenerative medicine space. It directly cites both the Michno/Kirkor PRP activation study and the Brasil rat study, building a coherent argument that PRF + biologics is a scientifically grounded combination worth pursuing clinically.