Acupuncture for Chronic Low Back Pain in Older Adults: A Randomized Clinical Trial

This randomized controlled trial represents an important milestone in research on acupuncture for chronic low back pain in older adults, a population that frequently faces unique challenges in pain management due to comorbidities and increased risks with conventional medications. The Back In Action study was conducted in response to a request from the Centers for Medicare and Medicaid Services to inform national coverage decisions, addressing a critical gap in the evidence on the effectiveness of acupuncture specifically for adults aged 65 years or older. The pragmatic design of the study involved 800 participants from four health systems across three geographic regions of the United States, reflecting a diverse sample in ethnic, racial, and socioeconomic terms. Participants were randomized into three groups: usual medical care (266 participants), standard acupuncture with 8-15 sessions over 12 weeks plus usual care (265 participants), and enhanced acupuncture including the standard protocol plus 4-6 additional maintenance sessions over the subsequent 12 weeks (269 participants).

The intervention was restricted to needling only, aligning with the parameters expected for Medicare-reimbursable acupuncture treatment. More than 50 licensed acupuncturists participated, mirroring typical community practice and enhancing the pragmatic nature of the study. The primary outcome was back-pain-related disability measured by the change in the Roland-Morris Disability Questionnaire (RMDQ), 0-24 points, from baseline to 6 months. Results demonstrated that both acupuncture groups had significantly greater improvements compared to usual care.

At 6 months, the standard acupuncture group showed an adjusted mean difference of -1.0 points on the RMDQ, while the enhanced acupuncture group demonstrated -1.5 points, both with statistical significance. These improvements persisted at 12 months, indicating durable benefits. The proportion of participants achieving clinically significant improvement (≥30% reduction) was substantially higher in the acupuncture groups: 39.1% for standard acupuncture and 43.8% for enhanced acupuncture, compared to 29.4% in the usual care group. Interestingly, while there were no statistically significant differences between the two acupuncture groups for the primary outcome, the enhanced acupuncture group showed relative benefits for pain intensity and global impression of change.

The safety profile was excellent, with low and similar rates of serious adverse events between groups, and fewer than 1% of events possibly related to the acupuncture intervention. The most common minor adverse events were pain or discomfort at needling sites. The clinical implications are substantial, especially considering that older adults have a higher prevalence of comorbidities with consequent polypharmacy, and age-related physiological changes place them at substantially increased risk for adverse effects with medications commonly prescribed for chronic low back pain. Acupuncture demonstrated effectiveness comparable to other evidence-based treatments recommended for chronic low back pain, but with a superior safety profile.

The study has several important limitations. As a pragmatic comparative-effectiveness study, it used a usual-care comparator rather than a sham control, which does not allow separation of specific effects from attention or other nonspecific effects. The self-reported nature of outcomes and the inability to fully blind participants to the acupuncture intervention may also influence results. Additionally, differential loss to follow-up between groups may introduce bias, despite imputation and weighting efforts to correct for it.

The study also did not assess medication changes due to limited availability of dispensing data at some clinical sites. Despite these limitations, the findings provide robust evidence for acupuncture as an effective and safe treatment option for chronic low back pain in older adults. The magnitude and pattern of benefit were comparable to prior acupuncture studies and other evidence-based treatments, but with a substantially lower risk profile than pharmacological therapies. These results support acupuncture as a potential first-line treatment for this population, especially given the relatively high risks and potential adverse consequences of polypharmacy among older adults.