Condition Focus: RA and OA — Edema Reduction and Wavelength Optimisation
This 2025 review from Fonseca and colleagues in Photochemistry and Photobiology synthesizes both in vitro and in vivo evidence for LED-based PBM in rheumatoid arthritis and osteoarthritis. While many PBM studies use laser sources, this review focuses specifically on LED delivery — the same technology used in the G.O.A.T. — making it directly relevant to LED-based device design.
The review’s most important finding for device development is the wavelength-dependent edema response: longer NIR wavelengths (685, 830, and 940 nm) consistently outperformed shorter red wavelengths (628 nm) for edema reduction. This wavelength dependence likely reflects the greater tissue penetration of NIR light — edema in a joint involves fluid in the synovial space, subchondral tissue, and periarticular soft tissue, all of which sit beneath the skin surface and require deeper-penetrating wavelengths.
The review also confirmed reduced inflammatory infiltrate and cartilage protection across multiple arthritis models (collagen-induced RA, zymosan-induced arthritis, OA models). The combination of edema reduction, inflammatory cell suppression, and cartilage preservation represents a comprehensive anti-arthritic effect from a single LED-based intervention.
G.O.A.T. for Gout Alignment:
The G.O.A.T.’s 850 nm wavelength falls squarely within the NIR range identified here as superior for edema reduction. As an LED-based device, the G.O.A.T. directly benefits from this LED-specific evidence base. The wavelength advantage for edema reduction supports the device’s dual-wavelength design: 660 nm for surface anti-inflammatory effects and 850 nm for deep-tissue edema reduction.
Link to original research here
Editor’s note: The wavelength-dependent edema response documented here is complemented by the dose-dependent edema data in Al Musawi et al 2026. The bioimpedance-measured swelling reduction is demonstrated clinically in Chia et al 2025. For the 660 nm anti-edema effect via cannabinoid receptor pathways, see Neves et al 2018. The cartilage-protective effects are explored with human chondrocytes in Oliveira et al 2025.
Related Articles
- PBM for Reducing RA Using Different Energy Densities – Al Musawi et al 2026
- PBM on Swelling Reduction and Recovery in TKA – Chia et al 2025
- PBM Improves Acute Inflammation via Cannabinoid Receptor Activation – Neves et al 2018
- NIR PBM Stimulates Cartilage Matrix Synthesis in Human Chondrocytes – Oliveira et al 2025
- PBM Inhibits TMJ Inflammation and Reduces Edema – 2021
Key Takeaways
- NIR wavelengths (685–940 nm) outperform shorter wavelengths for joint edema reduction
- LED-specific evidence — directly relevant to LED-based device design
- Reduced inflammatory infiltrate and cartilage protection across multiple arthritis models
- Supports the G.O.A.T.’s dual-wavelength approach: 660 nm surface + 850 nm deep edema
Study Overview
| Study Type: | Review |
| Wavelength(s): | Red (628–660 nm) + NIR (685–940 nm) |
| Treatment Protocol: | Varies across reviewed studies |
| Sample Size: | Review of in vitro and in vivo arthritis studies |
| Primary Outcome: | Edema↓ (NIR superior); inflammatory infiltrate↓; cartilage protection |
Full Citation
Fonseca ASF, et al. (2025). LED photobiomodulation on rheumatoid arthritis and osteoarthritis: in vitro and in vivo evidence. Photochemistry and Photobiology. View Publication
