Spasticity is usually caused by central nervous system injuries, such as brain injuries or spinal cord injuries. Spasticity is a little different from stiffness.
As your child with CP is becoming a teenager, there are a couple of things you may want to think about.
Cerebral palsy is a damage to the developing brain in the motor part of the brain. Individuals with cerebral palsy have problems with weakness and sometimes also involuntary movements.