Sun et al in 2001 studied the use of acupuncture for frozen shoulder. The study was a randomized controlled trial to evaluate the effectiveness of acupuncture as a treatment for frozen shoulder. Thirty-five subjects were included in this study with a diagnosis of frozen shoulder. They were randomly divided into exercise group as the control group and exercise plus acupuncture group as the treatment group. They were treated for a period of six weeks. The study assessed functional mobility, power, and pain using constant shoulder assessment before treatment, at 6 weeks, and at 20 weeks by a blinded evaluator. The analysis was based on the intention-to-treat principle. Exercise combined with acupuncture resulted in significantly greater improvement than the exercise group. The improvement in the exercise group was 39.8% (SD 27.1) and in the exercise plus acupuncture group was 76.4% (55.0) at 6 weeks evaluation (P = 0.048). Improvements were maintained at reassessment at 20 weeks with 40.3% (SD 26.7) in the exercise group and 77.2% (SD 54.0) in the exercise plus acupuncture group (P = 0.025) [35].Guerra de Hoyos et al in 2004 studied the long-term effect of acupuncture on shoulder pain. The objective of the study was to compare the effectiveness of electroacupuncture with placebo acupuncture for the treatment of shoulder pain. The study was a randomized, placebo-controlled trial. Subjects were recruited from public primary care clinics in Spain. Participants were patients aged 25 to 83 years with shoulder pain. They were randomly assigned to an electro-acupuncture group and a placebo acupuncture group without skin penetration. Both groups were allowed to take diclofenac if the pain was too severe. The prima...... middle of paper ......ients with chronic shoulder pain. They recruited 18 patients with non-radiating shoulder pain for at least 6 months and normal neurological findings. They were randomized into two groups, the trigger point acupuncture group and the sham acupuncture group. Each group receives five treatment sessions. Outcome measures were pain intensity (measured using a visual analogue scale, VAS) and shoulder function (measured using the Constant-Murley score, CMS). After treatment, pain intensity between pretreatment and 5 weeks after TrP decreased significantly (p < 0.001). Shoulder function also increased significantly from pre-treatment to 5 weeks post-TrP (p < 0.001). Trigger point acupuncture showed better results than sham acupuncture (p = 0.024). This study shows that trigger point acupuncture is more effective for chronic shoulder pain than sham acupuncture. [44].