Hemiplegia effects one in one thousand people.

Hemiplegia is considered type of cerebral palsy that can result from damage to different parts of the brain that control muscle movements. Hemiplegia means the paralysis of one side of the body. A related term, hemiparesis, is a weakness on just one side of the body. The paralysis in the body occurs on the side opposite to the section of affected brain in children with Hemiplegia .

You can find out more about Hemiplegia here.