Open Question: Workers compensation concern, help please?

I am a server at a chain restaurant, and last night I was putting a drink tray back on the rack when my elbow popped. I tried to shake it out but realized that it wasn't working and became quite painful as time went on. So I immediately told my employer that I can no longer work because my elbow really hurts. So I filled out an injury report and they gave me a Workers Comp form to fill out and