Acupuncture for Japanese Katakori (Chronic Neck Pain): A Randomized Placebo-Controlled Double-Blind Study

This important Japanese study investigated the efficacy of acupuncture in treating chronic stiffness of the neck and shoulders, known in Japan as "katakori," an extremely common condition affecting millions of people. Stiffness of the neck and shoulders is described by patients as a sensation of heaviness, tightness, and discomfort in the muscles supporting the neck, ranking as the second most frequent complaint in Japan, after lumbar pain. This condition has become increasingly prevalent with intensive use of computers and electronic devices in work and daily life.

The primary objective of this research was to scientifically evaluate whether acupuncture with superficial skin penetration truly offers specific benefits compared with placebo treatments, using a rigorously controlled methodology. The researchers conducted a randomized double-blind placebo-controlled study, involving 400 volunteers with essential stiffness of the neck and shoulders. Participants were divided into four groups: treatment with penetrating needles (real acupuncture), treatment with needles that only touch the skin, treatment with needles that do not touch the skin (only the acupuncture ritual), and a control group without any treatment. Six experienced acupuncturists applied the needles at specific points traditionally used for this condition, with each session lasting ten minutes.

The results revealed surprising and clinically relevant findings. All three types of treatment that involved the acupuncture ritual showed significant improvements compared with the group that received no treatment, both immediately after the session and 24 hours later. This included even the group that received only the acupuncture ritual without any needle contact with the skin. However, after 24 hours, treatment with real acupuncture (skin penetration) proved superior to no-touch treatment, indicating that skin penetration has specific effects that last longer.

Interestingly, there was no significant difference between real acupuncture and treatment that only touched the skin, suggesting that even minimal stimuli can have important therapeutic effects.

For patients suffering from chronic stiffness of the neck and shoulders, these results provide valuable information. First, they confirm that acupuncture is effective for this condition, offering a valid therapeutic option, especially considering that conventional medical approaches frequently show limited results. The study also demonstrates that part of the benefits of acupuncture may be related to the ritual and treatment experience itself, which does not diminish its therapeutic validity but helps to better understand how it works. For health care professionals, these findings reinforce the importance of considering both the specific effects of interventions and aspects related to comprehensive patient care.

The study also provides robust evidence on the safety of acupuncture, with only two minor adverse events related to small bleeding.

Several important limitations should be considered when interpreting these results. The study evaluated only a single treatment session with short-duration follow-up, while in clinical practice acupuncture is frequently applied across multiple sessions over weeks. Additionally, superficial insertion of only 5 mm was used, which may not fully represent traditional acupuncture practice that often employs deeper insertions. The researchers also acknowledge that informing patients about the existence of different types of placebo needles may have influenced their perceptions and responses to treatment.

In conclusion, this pioneering study provides robust scientific evidence that acupuncture is effective in treating chronic neck and shoulder stiffness, demonstrating both specific benefits from needle penetration and benefits related to the therapeutic ritual. The results suggest that acupuncture may be a valuable therapeutic option for people suffering from this common condition, especially considering its safety and the scarcity of effective conventional treatments. Future research should explore protocols with multiple sessions and deeper insertions to better understand the full potential of this ancient medical practice in the modern context.