Auricular acupuncture for pain relief after total hip arthroplasty – a randomized controlled study

**Auricular Acupuncture for Pain Relief After Hip Surgery: A Promising Scientific Study**

Postoperative pain is a constant concern for both patients and health professionals. Even with advances in pain medicine and the use of modern techniques such as patient-controlled analgesia (PCA) pumps, many people still experience significant discomfort after surgical procedures. Studies show that approximately 29% of patients still feel moderate pain and 11% feel intense pain even when receiving analgesic treatments considered adequate. In addition, opioid medications used for pain control can cause unpleasant side effects such as nausea, vomiting, itching, and even respiratory depression, which can compromise quality of life during recovery.

It is in this context that complementary techniques such as auricular acupuncture gain interest as alternatives to improve postoperative pain control.

German researchers at Ernst Moritz Arndt University conducted a rigorous study to evaluate whether auricular acupuncture could help reduce the need for pain medications after total hip replacement surgery. The main objective was to compare the efficacy of true auricular acupuncture with a simulated procedure (placebo) in patients undergoing this type of orthopedic surgery. The methodology employed was a randomized controlled clinical trial, considered the gold standard in medical research, in which neither the patients, nor the anesthesiologists, nor the assessors knew which treatment was being applied to each person. Sixty-one patients were initially included in the study and randomly divided into two groups: one received auricular acupuncture at specific points (hip, shenmen, lung, and thalamus) and the other received needles at points not considered acupuncture points.

The permanent needles were placed the day before surgery and maintained for three days after the procedure. The main parameter evaluated was the amount of piritramide (an opioid medication for pain) that patients used through the patient-controlled analgesia pump in the first 36 hours after surgery.

The results were quite encouraging for auricular acupuncture. Fifty-four patients completed the study, with 29 in the true acupuncture group and 25 in the control group. The most important finding was that patients who received auricular acupuncture at the specific points required 32% less pain medication in the first 36 hours after surgery, compared with the control group. Specifically, the acupuncture group used an average of 37 milligrams of piritramide, while the control group used 54 milligrams.

When this result was adjusted for patient body weight, the difference was even greater, reaching 35% reduction in medication use. In addition, patients in the acupuncture group took longer to request the first dose of analgesic after surgery (40 minutes versus 25 minutes in the control group). Considering the entire three-day postoperative period, the total reduction in opioid medication use was 36% in the acupuncture group. It is important to note that, despite using fewer medications, the pain levels reported by patients were similar in both groups, indicating that acupuncture provided additional pain relief without compromising patient comfort.

For patients, these results suggest that auricular acupuncture can be a valuable tool in managing postoperative pain, especially when used as a complement to conventional treatment. The significant reduction in the need for opioid medications is particularly relevant, as it can decrease exposure to the side effects of these medications, such as nausea, drowsiness, and constipation. For health professionals, the study offers scientific evidence that auricular acupuncture can be incorporated into postoperative pain management protocols. The technique proved to be safe, with only a few minor side effects such as small bleeding at the needle site in two patients, local pain in three patients, and headache in one patient.

The procedure is relatively simple to apply and can be performed by trained professionals, with the needles remaining in place for several days without the need for constant manipulation. The ability to maintain adequate levels of pain control while reducing dependence on medications represents an important advance in perioperative medicine.

However, the study has some important limitations that should be considered. The number of patients evaluated, although adequate to detect significant differences, was relatively small (54 patients), which may limit the generalizability of the results. In addition, all participants were of the same ethnicity (Caucasian) and had never previously received acupuncture, factors that may influence the response to treatment. The study was conducted at a single institution in Germany, and the results may vary in different cultural contexts and healthcare systems.

Another point to consider is that the control group also received needles, only at different locations, which may have provided some beneficial effect due to skin stimulation, potentially reducing the difference between groups. The researchers also acknowledge that the use of mechanical rather than electronic pumps for analgesia control limited some analyses. It is essential that future studies be conducted with larger and more diverse populations, in different medical centers, and comparing auricular acupuncture not only with placebo but also with standard treatment alone, to better define its role in routine clinical practice.