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 diagnosed with frozen shoulder were included in this study. They were randomly divided into an exercise group as the control group and an 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 the Constant assessment of the shoulder before treatment, at 6 weeks, and at 20 weeks by a blinded assessor. The analysis was based on the intention-to-treat principle. Exercise plus acupuncture had significantly greater improvement than the exercise group. The improvement in the exercise group was 39.8% (standard deviation 27.1) and in the exercise plus acupuncture group was 76.4% (55.0) at the 6-week assessment (P=0.048). Improvements were maintained at the 20-week reassessment with 40.3% (standard deviation 26.7) in the exercise group and 77.2% (standard deviation 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 for 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 divided into the electroacupuncture group and the non-skin-penetrating placebo acupuncture group. Both groups could take diclofenac if the pain was too severe. The first…half of the article…patients with chronic shoulder pain. They recruited 18 patients with nonradiating 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 the visual analog 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 between pretreatment and 5 weeks after TrP (p<0.001). Trigger point acupuncture showed better results than sham acupuncture (p=0.024). This study demonstrates that trigger point acupuncture is more effective for chronic shoulder pain than sham acupuncture [44].