Acupuncture for Post-stroke Shoulder-Hand Syndrome: A Systematic Review and Meta-Analysis

Shoulder-hand syndrome is one of the most challenging complications faced by people who have had a stroke, affecting between 12% and 49% of survivors. This condition, also known as complex regional pain syndrome type I, causes disabling symptoms such as intense pain, joint swelling, stiffness, and severe limitations in movement of the affected arm and hand. The impact on patients' quality of life is substantial, as it significantly interferes with the ability to perform basic daily activities. Although various conventional treatment options are available, including physical therapy, medications, and regional anesthesia techniques, scientific evidence regarding their efficacy is still insufficient.

In this context, acupuncture has been increasingly considered a promising complementary therapy, especially in Asian countries where traditional Chinese medicine is widely accepted and integrated into the healthcare system.

This study represents a comprehensive systematic review of the scientific literature, with the objective of rigorously evaluating both the efficacy and the safety of acupuncture as an adjunct treatment to conventional rehabilitation for post-stroke shoulder-hand syndrome. The researchers conducted an extensive search in nine scientific databases, five in English and four in Chinese, covering all available literature from the inception of these databases through January 2019. Only randomized controlled trials comparing acupuncture combined with rehabilitation versus rehabilitation alone were included. The methodology was rigorously planned, with specific inclusion criteria requiring confirmation of stroke diagnosis by imaging studies and clinical diagnosis of shoulder-hand syndrome based on characteristic symptoms.

The researchers assessed the methodological quality of the studies using standardized tools and performed sophisticated statistical analyses to combine the results of different studies, enabling more robust conclusions.

The analysis included 38 clinical studies involving 3,184 participants, revealing encouraging results for the use of acupuncture as a complementary therapy. Regarding upper limb motor function, measured by the Fugl-Meyer scale, the combination of acupuncture with rehabilitation showed a mean improvement of 8.01 points compared with rehabilitation alone, a difference that is considered clinically significant. As for pain, assessed through the visual analog scale, patients who received acupuncture together with rehabilitation showed a mean reduction of 1.59 points in pain intensity. For activities of daily living, there was a mean improvement of 9.99 points on the Barthel Index, indicating greater functional independence.

Additional analyses showed that both manual acupuncture and electroacupuncture were effective, and that the duration of treatment did not significantly influence the results. Interestingly, the most commonly used acupuncture points were those located around the shoulder and arm, following traditional Chinese medicine principles that focus on local treatment of the affected area.

For patients and family members, these results offer a hopeful perspective on treatment options that may accelerate recovery and reduce the suffering associated with post-stroke shoulder-hand syndrome. Acupuncture, when used as a complement to conventional physical therapy and occupational therapy, may provide additional benefits both in pain relief and in improvement of motor function and independence in daily activities. For healthcare professionals, especially those working in neurological rehabilitation, this study provides scientific evidence that may guide clinical decisions about incorporating acupuncture into the treatment plan for patients with post-stroke shoulder-hand syndrome. The combination of therapies may be particularly valuable considering that shoulder-hand syndrome is often resistant to isolated conventional treatments.

It is important to note that acupuncture proved safe, with few adverse events reported, although the quality of safety reporting was limited in most studies.

However, it is essential to recognize the limitations of this research that affect the confidence we can have in clinical recommendations. All included studies were conducted in mainland China, raising questions about the applicability of the results to other populations and healthcare systems. The overall methodological quality of the studies was considered low by current scientific standards, primarily due to the lack of studies with control groups using sham acupuncture (placebo), which makes it impossible to determine whether the observed benefits are specific to acupuncture or result from positive psychological effects. In addition, there was great variability across studies regarding treatment duration, number of sessions, and specific acupuncture techniques used.

Most studies did not adequately report adverse events, limiting our understanding of treatment safety, and no study included long-term follow-up to assess whether benefits are maintained after treatment ends. The certainty of evidence was rated as low, indicating that future research may substantially modify these conclusions. Therefore, although the results are promising, studies of higher methodological quality, including adequate control groups and extended follow-up, are needed before acupuncture can be routinely recommended as standard treatment for post-stroke shoulder-hand syndrome.