To investigate the efficacy and safety according to the frequency of focused ESWT in patients with myofascial pain syndrome.

Myofascial pain syndrome is one of the common causes of musculoskeletal pain seen in clinical practice and is characterized by the presence of trigger points associated with sensitive areas such as taut bands of skeletal muscle. It may also be accompanied by referred pain, which is pain in other parts of the body. Although the pathophysiology and etiology of myofascial pain syndrome and trigger points are still unknown, there are reports that myofascial pain is a complex form of neuromuscular dysfunction caused by motor and sensory abnormalities involving both the peripheral nervous system and the central nervous system. Recently, it has been considered as a method of treatment for myofascial pain syndrome. In addition, although pain reduction and functional improvement of focused ESWT in patients with myofascial pain syndrome have been reported, related studies are lacking on the effect of focused ESWT according to the frequency difference. The purpose of the study is to examine the efficacy and safety of focused type ESWT frequency in patients with myofascial pain syndrome.

Inclusion Criteria:

1. Those diagnosed with myofascial pain syndrome according to Simon's criteria
2. Pain is 4 points or more on the Numerical Rating Scale (NRS)

Exclusion Criteria:

1. Pain is due to trauma, fibromyalgia and neurological disorders including neuromyopathy, myelopathy, and stroke
2. If you have received injection treatment for trigger points within the last 2 months or have had surgery on the painful area within 1 year
3. If there is a high risk of bleeding due to severe coagulopathy, etc. or if you have recently had severe bleeding (except taking antiplatelet)
4. If you have a tumor, infection, kidney failure, severe liver disease, epilepsy, skin disease, or mental retardation