Acupuncture for Low Back Pain: Reevaluation of Systematic Reviews and Meta-analyses

Low back pain is one of the leading causes of disability worldwide, affecting up to 84% of people at some point in their lives. Characterized by pain, stiffness, or muscle tension in the lumbar region, with or without radiation to the legs, low back pain frequently has no identifiable specific cause and is classified as nonspecific. This condition represents a significant challenge for healthcare systems globally, with approximately 23% of patients developing chronic pain and 11-12% presenting with functional disability. Against this backdrop, acupuncture has been recommended in several clinical guidelines as a treatment for acute and chronic low back pain, although questions remain about its actual efficacy based on high-quality scientific evidence.

This study aimed to reevaluate the methodological quality, reporting quality, and quality of evidence of systematic reviews and meta-analyses on acupuncture for low back pain, seeking to determine whether acupuncture truly treats this condition effectively. The investigators conducted a comprehensive search in eight international and Chinese databases, including PubMed, Embase, the Cochrane Library, Web of Science, and others, covering the period from database inception through December 2022. Only studies analyzing randomized controlled trials of acupuncture for low back pain were included, resulting in the selection of 23 systematic reviews and meta-analyses for the final analysis. Methodological quality was assessed using the AMSTAR 2 tool, reporting quality was analyzed using the PRISMA statement, and the quality of evidence was rated using the GRADE system.

The results revealed concerning findings about the quality of the available evidence. Of the 23 reviews analyzed, only one had moderate methodological quality, one had low quality, and a striking 21 studies were rated as critically low quality on the AMSTAR 2 assessment. The PRISMA analysis showed significant reporting deficiencies, especially in search strategies (problems in 34.78% of studies), assessment of the certainty of evidence (17.39%), information on registration and protocol (13.04%), and data and material availability (4.35%). More alarming was the GRADE assessment of 255 outcomes analyzed, in which only 13 were rated as moderate quality, 88 as low quality, and 154 as very low quality.

Despite these methodological limitations, the studies indicated that acupuncture was effective in treating low back pain compared with control groups.

For patients considering acupuncture as a therapeutic option for low back pain, these results carry important implications. Although the evidence suggests that acupuncture may be beneficial for low back pain relief, the low methodological quality of the studies means that the real benefits may be smaller than reported. Clinicians should interpret these findings with caution, informing patients about both the potential benefits and the limitations of current evidence. Acupuncture appears to be most effective when compared with sham treatments, conventional Western medicine, physical therapy, or usual care, and when combined with other therapies.

Different acupuncture techniques, including electroacupuncture, auricular acupuncture, and warm acupuncture, showed varying degrees of efficacy, suggesting that treatment personalization may be important to optimize therapeutic outcomes.

The main limitations identified include the lack of pre-specified study protocols in 91% of the reviews, incomplete literature searches, inadequate reporting of funding and conflicts of interest, and inadequate methodology for assessing publication bias. Publication bias was the most common factor leading to downgrading the quality of evidence, followed by methodological limitations of the primary studies, imprecision of the data, and inconsistency of the results. Many of the included studies had significant methodological problems, including inadequate randomization, lack of allocation concealment, and insufficient blinding. In addition, overlap of clinical trials across different reviews may have led to double counting of results, potentially inflating the apparent benefits of acupuncture.

In conclusion, although the available evidence suggests that acupuncture has certain advantages in the treatment of low back pain, the overall methodological quality of the systematic reviews and meta-analyses, as well as the quality of evidence for clinical outcomes, still requires substantial improvement. Therefore, more rigorous and comprehensive future studies are needed, including multicenter randomized controlled trials with larger samples, adequate randomization, and double blinding, to improve the quality of systematic reviews in this field and to provide more reliable evidence on the real efficacy and safety of acupuncture in the management of low back pain. Patients and clinicians should consider these limitations when making treatment decisions, maintaining realistic expectations about the potential benefits of acupuncture while awaiting higher-quality evidence.