They aren't. These are in Hanger Clinics which do orthotics and prosthetics. They made this kid's prosthesis and are showing other kids that come in what to expect

These are created by Hanger Clinic which is an orthotics and prosthetics company. The people in the pictures are Hanger clinic patients and show new patients what to expect.

These are posters in Hanger Clinics. They are a large orthotics and prosthetics company with locations all over the US.