Osteoarthritis: Potential of Pulsed Electromagnetic Field Therapy

Pulsed electromagnetic field (PEMF) therapy has emerged as a promising non-invasive modality for the management of osteoarthritis (OA), particularly as an adjunct to standard care. This narrative review examines current clinical evidence, mechanistic insights, and future directions for PEMF in OA based on a theoretical framework. Clinical studies consistently show encouraging results that PEMF reduces pain, stiffness, and functional limitations, supporting its role in symptomatic management. However, evidence for disease-modifying effects, such as cartilage preservation or regeneration, remains limited and inconclusive, with most trials underpowered relative to Phase III standards and characterised by substantial variability in treatment protocols. Mechanistic studies indicate that PEMF modulates key biological pathways relevant to OA, including calcium–calmodulin-dependent nitric oxide signalling, inflammatory cytokine regulation, and metabolic reprogramming of chondrocytes. Emerging evidence further implicates targets such as hexokinase 2 and 15-hydroxyprostaglandin dehydrogenase in catabolic and regenerative processes. These findings suggest that PEMF has the potential to influence both symptom expression and underlying disease biology. Building on these insights, the authors propose a framework for the rational design of targeted PEMF protocols based on molecular mechanisms and disease stage. Theoretical modelling of enzyme–substrate interactions provides preliminary estimates of field strengths required to modulate key enzymatic drivers of cartilage degradation. Such an approach, although computationally based and with inherent limitations, may facilitate the transition from empirically applied PEMF therapies to mechanism-based interventions. Future research should prioritise standardised protocols, mechanistic validation, and adequately powered clinical trials to fully evaluate the potential of PEMF as a disease-modifying therapy in osteoarthritis.