TENS (transcutaneous electrical nerve stimulation) is a small device that sends mild electrical pulses through sticky pads on the skin. It is used to help manage pain without needles or pills.

When after knee replacement did TENS help most in this review?

Pain relief was clearest at 24 and 72 hours after surgery. At two weeks, average pain scores were not significantly different from control care.

Did TENS reduce the need for opioid pain medicines?

Yes. Across the pooled analyses, people who received TENS used fewer opioids than those in control groups, and nausea or vomiting was reported less often with TENS.

Research Summary

TENS After Knee Replacement Cut Early Pain and Opioid Use, Umbrella Review of Meta-Analyses Finds

By KneePainNews Editorial Team · November 6, 2026 · Editorial Standards

Not medical advice. This is a plain-English summary for general information. Talk to your doctor or physical therapist before changing your care. Read our medical disclaimer.

A noninvasive nerve-stimulation device used after knee replacement helped with early pain and reduced opioid needs, according to a new umbrella review that pulled together prior meta-analyses. The paper was published online in 2026 in the Journal of Orthopaedics and Traumatology.

What was studied

Total knee arthroplasty (knee replacement) can leave people with strong short-term pain that slows rehab. Transcutaneous electrical nerve stimulation (TENS) delivers mild electrical pulses through pads on the skin and is sometimes added to usual pain care. Rather than running one new trial, the authors searched for published meta-analyses through September 2025 in PubMed/MEDLINE, Embase, the Cochrane Library, and Web of Science, then summarized overlapping evidence with quality tools (including AMSTAR 2 and GRADE) and an overlap check (GROOVE).

They included 11 meta-analyses of TENS as an add-on after knee replacement and reported pooled estimates for pain, opioid use, function, and hospital stay.

Key findings

TENS significantly reduced acute postoperative pain at 24 hours (mean difference −0.42 on the pain scale used) and at 72 hours (mean difference −0.84), with low statistical heterogeneity at those early time points.
At 2 weeks, pain scores did not differ significantly from control care, and that comparison was highly heterogeneous.
People who received TENS used fewer opioids (standardized mean difference −0.58).
Early range of motion, Hospital for Special Surgery scores, and length of hospital stay also favored TENS; nausea and vomiting were reported less often with TENS.

What it means for people with knee pain

If you are planning or recovering from knee replacement, ask your surgical and rehab team whether TENS is part of their pain plan. This overview suggests it can help most in the first few days, when pain and opioid needs are highest, and may support early movement. It is an add-on, not a replacement for the rest of your prescribed care, and settings and timing should come from clinicians who know your history.

Limitations

Umbrella reviews depend on the quality and overlap of earlier meta-analyses, and TENS protocols (pad placement, intensity, timing) were not uniform. Benefits at two weeks were unclear. The authors say future work should standardize how TENS is applied and test longer-term results and safety more carefully.

Source: Huang M, Tang P, Wen T, et al. The efficacy of transcutaneous electrical nerve stimulation as an adjunctive therapy for perioperative pain management after total knee arthroplasty: an umbrella review. J Orthop Traumatol. 2026 Jul 22;27(1):62. doi:10.1186/s10195-026-00957-z. PMID 42902059. Read the original

Frequently asked questions

What is TENS?: TENS (transcutaneous electrical nerve stimulation) is a small device that sends mild electrical pulses through sticky pads on the skin. It is used to help manage pain without needles or pills.
When after knee replacement did TENS help most in this review?: Pain relief was clearest at 24 and 72 hours after surgery. At two weeks, average pain scores were not significantly different from control care.
Did TENS reduce the need for opioid pain medicines?: Yes. Across the pooled analyses, people who received TENS used fewer opioids than those in control groups, and nausea or vomiting was reported less often with TENS.

Sudden severe pain, swelling, or can't bear weight? Seek medical care promptly. In an emergency call 911.