Wrist middle finger broke. That correct?

Hi, I met with an accident yesterday night around 10 pm and completely fallen from bike. My middle finger bone which starts from wrist and visited doctor. They just did some initial cure treatment and took x-ray. It was shown the bone was broke and doctor suggested  either plaster or rod. I was shocked and thought rod fitting was not good at that time. So went for plaster but still thinking am I taken right decision?. He just gave me two answers , rod gives you 90 % and plaster gives you 80% strength like before. I am in bit confusion and thinking which one to go. He gave me two days of time for roof fitting. Is that correct? Please guide me whether I have to continue with plaster or go for rod fitting. Attached x-ray copy.