Key Takeaway
PEMF therapy significantly improved pain, stiffness, and physical function in osteoarthritis patients compared to placebo across 15 randomized controlled trials.
Summary
This systematic review and meta-analysis examined 16 randomized placebo-controlled trials to determine whether pulsed electromagnetic field (PEMF) therapy improves symptoms and quality of life in patients with osteoarthritis. The authors searched multiple databases through April 2019 for English-language RCTs with symptom or quality-of-life outcomes.
Fifteen studies with complete data were included in the meta-analysis. Results showed significant benefits of PEMF over placebo for pain (SMD = 1.06, 95% CI 0.61-1.51), stiffness (SMD = 0.37, 95% CI 0.07-0.67), and physical function (SMD = 0.46, 95% CI 0.14-0.78). The effect on quality of life trended positive but did not reach statistical significance (SMD = 1.49, 95% CI -0.06 to 3.04).
Interestingly, specific PEMF parameters (frequency, intensity, duration) did not significantly influence outcomes, suggesting that the therapy works across a range of protocols. The authors concluded that PEMF provides meaningful short-term benefits for osteoarthritis symptoms, though longer-term effects and quality-of-life impacts require further study.
Methods
- Systematic review and meta-analysis of randomized placebo-controlled trials
- Database search through April 2019 (multiple databases)
- 16 studies included in systematic review, 15 in meta-analysis
- Patients with osteoarthritis (various joints)
- Outcomes: pain, stiffness, physical function, quality of life
- Standardized mean difference (SMD) as effect measure
- Subgroup analyses by PEMF parameters
Key Results
- Significant pain reduction vs placebo (SMD = 1.06, 95% CI 0.61-1.51)
- Significant stiffness improvement (SMD = 0.37, 95% CI 0.07-0.67)
- Significant physical function improvement (SMD = 0.46, 95% CI 0.14-0.78)
- Quality of life improvement trended positive but not significant (SMD = 1.49, 95% CI -0.06 to 3.04)
- PEMF parameters did not significantly influence symptom outcomes
- Treatment duration not critical for pain management
Limitations
- Evidence limited to short-term effects
- Quality-of-life effects not conclusively demonstrated
- High heterogeneity across studies
- English-language studies only
- Varied PEMF devices and protocols across trials
- Most studies had relatively small sample sizes