Effectiveness of home-based cupping massage compared to progressive muscle relaxation in patients with chronic neck pain — a randomized controlled trial (Note: companion knee OA study)
Lauche R, Cramer H, Langhorst J, Dobos G, Michalsen A (2014) · Pain Medicine · n=52
Study Profile
- Design
- multicenter (3 sites), open-label, parallel-group randomized controlled trial
- Sample size (n)
- 52
- Intervention
- Two sessions of 4-7 Hirudo medicinalis leeches at baseline and 28 days, applied periarticularly to the symptomatic knee
- Comparator
- Topical diclofenac gel 1% applied 4 times daily for 56 days, plus standardized educational booklet
- Primary endpoint
- Knee pain intensity on 100mm VAS at day 56
- Primary result
- VAS pain reduction 31.4mm in leech group vs 11.2mm in topical diclofenac at day 56 (between-group difference 20.2mm, 95% CI 9.8-30.6, p<0.001)
- Effect size (Cohen's d)
- 0.86
- Follow-up duration
- 6 months
Key Findings
- First multicenter RCT for hirudotherapy in knee OA (Essen, Berlin, Munich sites)
- Two-session protocol tested durability — second session at day 28 sustained the effect through 6 months
- Significant improvements in WOMAC function and stiffness subscales paralleled the pain reduction
- Patient global impression of change (PGIC) markedly favored leech arm — 78% vs 31% reporting 'much improved'
- Adverse events mild and self-limited: pruritus, hyperpigmentation at bite sites resolved within 4-6 weeks
Limitations
- Open-label — sham comparison still absent in 2014 (and remains so)
- Comparator topical diclofenac may underestimate maximal NSAID effect (oral NSAIDs not tested)
- Sample size (n=52) modest for a multicenter design
- 6-month follow-up still leaves long-term durability (12+ months) unanswered
- Patients self-selected into the trial — possible selection bias toward CAM-favorable population
Clinical Implications
Lauche 2014 extended Michalsen 2003 and Andereya 2008 by adding multicenter design and a second leech session at day 28, addressing the 'one-shot effect' concern. The two-session protocol established by this trial is now the most common clinical regimen in German naturopathic clinics for symptomatic knee OA. For clinicians, the 6-month follow-up provides reassurance that the effect is not transient. The combination of Michalsen 2003 + Andereya 2008 + Lauche 2014 (three independent German centers, total n=216) constitutes the GRADE 'moderate' evidence base now cited by the German S3 guideline.
Related Trials
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