aging

Hi, As your immediate problem seems to be tearing your calf muscle due to running, I doubt this is connected directly with your cerebral palsy.  However, the effects of cp can mean that calf muscles are very tight and this would have been the case as a child.  Have you ever had any treatment like surgery or Botox on your calf muscles?  If not, it may be worth asking for a referral to a neurologist otherwise your orthopaedic doctor should be able to treat your needs. 

Don't know of any specialists in the US but you could try asking the United CP Association http://ucp.org/ as they are the main organisation in the US for people with cerebral palsy.