2. Methods
The protocol applied in this study is based on the principles of the Helsinki Declaration. The study was approved by the Faculty of Medicine Ethics Committee of Belgrade University (No. 213). All of the patients involved in the study submitted written consent forms for inclusion in the study. The research was performed at the Clinic for Rehabilitation dr Miroslav Zotovic. The study was carried out between September 1, 2021, and September 31, 2022.The study included 124 consecutive patients. With the method of equal randomization, the patients were divided into two groups. The first group was designated as the experimental group and had 62 patients treated with f-ESWT. The second group was selected as the control group; it included 62 patients treated with standard ultrasound therapy.