Feeling like an unnecessary ultrasound at Hana Orthopedic Clinic in Dobong-gu

My wrists and knees were hurting, so I looked for a hospital near my house and went to Hana Orthopedic Clinic. Naver said they opened at 8:30, so I went after 9, but there weren't many customers. After the examination, they suggested I get an X-ray, so I went to the imaging room, but the machine wasn't on, so I had to wait for it to turn on. After the X-ray, when I came back for a checkup, they said there was nothing wrong with my joints or bones, but then they suggested I get an ultrasound of my knee. My knee didn't look swollen, but they said they needed to check for fluid buildup, which made me feel like they were doing an ultrasound. After the examination, I received physical therapy. They did various physical therapy for my wrist, and only did infrared (I think) for my knee. The physical therapist was very kind.