Electromagnetic therapy improved knee extension strength; broader benefits remain uncertain
A trial in persistent knee osteoarthritis found a delayed strength improvement compared with sham treatment; mobility, joint structure and patient-reported outcomes showed no significant benefit.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
PEMF increased knee extension strength compared with sham treatment at follow-up. However, the trial did not detect significant improvements in knee flexion strength, muscle mass, joint structure, mobility or patient-reported outcomes. This supports a narrow strength finding in people with persistent knee osteoarthritis, while broader benefits remain uncertain.
The abstract does not supply an effect size or confidence interval for the significant extension-strength comparison, limiting assessment of its size and precision.
What researchers found
Knee extension peak torque
Compared with sham at 6 months after treatment; post hoc comparison, p = 0.042.
What changed
The positive result concerned measured strength during knee straightening. Although the authors also reported larger percentage changes in knee bending strength with PEMF, their post hoc comparison between treatments was not statistically significant.
Broader outcomes remained uncertain
The study also examined cartilage thickness, joint space, walking performance, chair standing and a knee-specific patient questionnaire. Those outcomes did not differ significantly between groups, leaving functional and structural benefits uncertain.
The original publication
Pulsed Electromagnetic Field Therapy for Mild-to-Moderate Knee Osteoarthritis: A Double-Blind, Randomized, Placebo-Controlled Clinical Trial.
Lau KKL, Chen ASC, Fu CHY et al.
J Cachexia Sarcopenia Muscle · 2026
- PubMed ID
- 41588476
- Record checked
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