TENS and 60-day peripheral nerve stimulation

TENS works only when dosed properly: a strong but comfortable sensory-level intensity, titrated during the session. Recommendations are condition-specific, and 60-day PNS is a definitive temporary treatment, not a trial.

1. Gate control is the historical rationale. Therapeutic electrical stimulation followed Wall and Melzack's 1965 gate control theory, which led to neuromodulation, including peripheral nerve stimulation applied directly to a named nerve ¹.
2. Intensity drives the TENS effect. In a 2026 meta-analysis of chronic low back pain, appropriate intensity gave a larger effect (d about 0.97) than inappropriate intensity (d about 0.30); with dosing ignored, TENS showed no significant effect ².
3. Titrate; do not fix the setting. The authors recommend a clearly perceptible sensory-level intensity titrated through the session, and generally advise against fixed intensity or stimulation strong enough to cause muscle contraction ².
4. TENS is strongly recommended against in hip and knee OA. The ACR/Arthritis Foundation guideline cites small, low-quality, variably controlled studies and a demonstrated lack of benefit for knee OA ³.
5. 60-day PNS is its own therapy. ASPN describes a percutaneous lead used for about 60 days and then removed, aiming for benefit that lasts after removal, distinct from a diagnostic trial or permanent implant ¹.
6. Lead design changed the risk profile. Older implanted PNS leads had high migration (9–25%) and infection (3.6–17.9%) rates; a coiled lead encourages fibrotic ingrowth, lowering both, and is FDA-cleared for up to 60 days ¹.

A negative diagnostic nerve block does not exclude PNS, because the mechanisms differ; ASPN states it is not a contraindication ¹.

• Frequency, number of sessions and electrode placement did not significantly change TENS effect in chronic low back pain ².
• Overall certainty for TENS in chronic low back pain is low, owing to high risk of bias and heterogeneity ².
• ASPN notes low infection rates and durable post-removal relief discourage routine trialing before a 60-day PNS course ¹.
• After a 60-day course, some patients keep relief for months; others relapse and may receive a permanent system ¹.
• By contrast, dorsal column SCS usually uses a brief 3–14-day trial, with ≥50% relief plus functional gain before permanent implant ¹.
• In osteoarthritis the ACR strongly recommends exercise while strongly recommending against TENS ³.
• ASH suggests TENS, massage, yoga, virtual reality and guided relaxation as add-ons for acute sickle cell pain ⁴.

• Concluding TENS "does not work" from trials that used subtherapeutic or fixed intensity ².
• Turning TENS up to visible muscle contraction for analgesia ².
• Recommending TENS for knee osteoarthritis ³.
• Requiring a positive nerve block before offering PNS ¹.