Frozen shoulder, also known as periarthritis of the shoulder joint, is commonly referred to as frozen shoulder and fifty shoulder. It is a chronic and specific inflammation of the shoulder capsule and its surrounding ligaments, tendons and bursae, which is characterized by gradual pain in the shoulder, especially at night, and progressively worsening, with the function of shoulder joint movement being restricted and getting worse, gradually relieving after reaching a certain level, until finally recovering completely. Frozen shoulder is a common condition that is characterized by shoulder joint pain and limited mobility. The disease is more common in women than in men and is more common in manual laborers. If not treated effectively, it may seriously affect the functional activities of the shoulder joint. There may be widespread pressure pain in the shoulder joint that radiates to the neck and elbow, and there may be varying degrees of atrophy of the deltoid muscle. The traditional treatment for frozen shoulder is mainly oral anti-inflammatory and analgesic drugs, acupuncture, massage and other physical therapy. These methods are slow and painful for patients. Most patients have difficulty in persevering and end up in failure. However, over the years, the pain department has developed a good treatment for frozen shoulder, which is periacetabular nerve block therapy. This method injects anti-inflammatory and analgesic solution directly into the painful points of the periarthritis, which can quickly relieve the painful symptoms of the patient and facilitate the recovery of the function of the patient’s periarthritis. This method is also known as the “nemesis” of frozen shoulder.