Magnetic Nanoparticles in Biomedical Rehabilitation: Emerging Applications in Physiotherapy and Targeted Therapeutics

Abstract

Magnetic nanoparticles have emerged as multifunctional materials for biomedical imaging, targeted drug delivery, controlled therapeutic release, magnetic hyperthermia, cell guidance, tissue engineering, and regenerative medicine. Superparamagnetic iron oxide nanoparticles are particularly important because their magnetic behavior can be remotely controlled while their surfaces can be modified with polymers, antibodies, peptides, growth factors, drugs, nucleic acids, and biomimetic molecules. These characteristics have generated interest in their possible integration with biomedical rehabilitation and physiotherapy, especially for bone healing, peripheral nerve repair, skeletal-muscle regeneration, cartilage restoration, tendon recovery, localized pain management, and the delivery of anti-inflammatory or regenerative agents.

This review examines the physicochemical design of magnetic nanoparticles, their interaction with external magnetic fields, and their emerging roles in rehabilitation-oriented medicine. Magnetic scaffolds may provide mechanical and biochemical cues that support osteogenesis, angiogenesis, axonal growth, myoblast alignment, and stem-cell differentiation. Magnetic targeting may also concentrate therapeutic agents or magnetically labelled cells at injured tissues while reducing systemic exposure. Alternating magnetic fields can produce localized heating for hyperthermia or temperature-triggered drug release, whereas static or low-frequency fields may generate mechanical forces within magnetically responsive biomaterials. Nevertheless, most applications directly related to physiotherapy remain at laboratory or animal-study stages. Established clinical uses of iron-oxide nanoparticles in medicine do not yet demonstrate that magnetic nanoparticle treatments are effective replacements for exercise therapy, manual therapy, electrotherapy, rehabilitation training, or conventional pharmacological management. Translation requires standardized characterization, realistic dosing, long-term toxicity assessment, controlled clinical trials, rehabilitation-specific outcome measures, and interdisciplinary collaboration. Magnetic nanoparticles are therefore best understood as potential adjunctive platforms that may increase the precision and biological responsiveness of future rehabilitation interventions.