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I don't think it's a difference in usage as much as more awareness and activism in one country as opposed to another.
No, it really is a difference in usage. Until quite recently, "spastic" was a commonly used term in the UK for cerebral palsy. In the U.S., "spaz" became detached from its etymology decades ago. More here.

Last edited by MegMeg; 08/07/14 10:56 AM.