The study will be performed with participants who has diabetic frozen shoulder diagnosis after clinical examination and imaging procedures performed, held at Okan University Hospital, Physical Therapy and Rehabilitation Clinic. Data will be recorded with the shoulder evaluation form in the study and cases will be divided into three groups with simple randomization method. The initial range of motion of the participants will be evaluated bilaterally using an electro-goniometer. Muscle strength assessment will be performed with the MicroFET2 dynamometer at the appropriate measurement positions. Participants' pain assessment will be done in the rest, activity and night pain using the Visual Analog Scale. The Shoulder Pain Disability Scale will be used to assess participants' shoulder function. The short-form-36 questionnaire will be used evaluating the quality of life. Physiotherapy application will be applied to all three groups in the form of standard treatment protocol, duration and number. For the first group ESWT application will be done at energy density of 0.12 mJ/mm2, in the second group, at an energy density of 0.3 mJ/mm2, for the third group application will be done as sham ESWT. The physiotherapy program will be held for three sessions per week for four weeks. The ESWT will be administered once a week and in two separate sessions of 2000 strokes. It will be applied in combination with the physiotherapy program and will last for four weeks. After initial measurements, re-evaluations will be done in the fourth and sixth weeks. The statistics will be analyzed by appropriate methods.