What does the doctor say will happen to Johnny in The Outsiders?

I assume that you are talking about the first time that the doctor talks about Johnny.  This is the time where he is talking to Pony and his brothers, Soda and Darry, telling them about Dally and Pony.

At this point, the doctor says first of all that he does not know if Johnny is going to live.  He keeps talking about if Johnny lives.  He says that Johnny has broken his back.  He says that if Johnny does not die he will be crippled for the rest of his life because his back is broken.