The examinations and interventions are carried out or supervised by senior physicians with many years of experience and an FMH title in rheumatology, who are also SGUM and SONAR tutors. Ultrasound is not only a recognized and validated tool in diagnostics, but is also suitable for monitoring a therapeutic measure (e.g. decrease in the synovitis score in rheumatoid arthritis under treatment). Ultrasound plays a very important role in targeted puncture or infiltration under visualization.