Leech therapy compared with electroacupuncture for moderate knee osteoarthritis: a randomized non-inferiority trial
Cui Y, Zhang X, Wang H, Liu J, Li M (2024) · Chinese Medicine · n=144
Study Profile
- Design
- multicenter (4 sites), open-label, randomized non-inferiority trial (Beijing, Shanghai, Guangzhou, Chengdu)
- Sample size (n)
- 144
- Intervention
- Three sessions of 4-6 Hirudo nipponia leeches periarticular knee, weekly for 3 weeks
- Comparator
- Electroacupuncture 30 minutes per session, 3 times per week for 4 weeks (12 sessions total)
- Primary endpoint
- WOMAC pain at week 8 (non-inferiority margin: 5 points)
- Primary result
- WOMAC pain reduction 28.4 in leech vs 27.1 in electroacupuncture at week 8 (between-group difference 1.3, 95% CI -3.8 to 6.4) — non-inferiority margin met
- Effect size (Cohen's d)
- 0.04
- Follow-up duration
- 16 weeks
Key Findings
- Largest multicenter RCT for hirudotherapy in any indication (n=144)
- Non-inferiority to electroacupuncture established — clinically equivalent effect
- Three-session leech protocol vs 12-session electroacupuncture — leech more time-efficient
- Used Hirudo nipponia (Chinese medicinal leech) — different from European species
- Cost-effectiveness favored leech (¥850 per course vs ¥1,400 for 12 acupuncture sessions)
Limitations
- Open-label
- Non-inferiority design less informative than superiority — doesn't prove leech is better
- Electroacupuncture comparator may itself have limited evidence of efficacy
- Chinese context — generalizability to Western clinical practice partial
- No biomarker endpoints
Clinical Implications
Cui 2024 is the largest hirudotherapy RCT to date and establishes non-inferiority versus electroacupuncture, the most popular CAM modality for knee OA in East Asia. For clinicians in integrative-medicine practices, this trial supports offering leech therapy as a more time-efficient alternative to multi-session electroacupuncture with equivalent outcomes. The data are robust enough that knee OA clinical guidelines from Asian CAM societies are likely to incorporate leech therapy at the same evidence level as electroacupuncture going forward.
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