How many types of Spinocerebellar Ataxia are there?

How many types of Spinocerebellar Ataxia are there and which one is the worst type which can never be cured? Because my friend's brother got in a car accident and he broke his spine and now his leg is paralyzed and the doctor said he got this disease and its the worst of its kind and can never be cured. Please also... show more How many types of Spinocerebellar Ataxia are there and which one is the worst type which can never be cured? Because my friend's brother got in a car accident and he broke his spine and now his leg is paralyzed and the doctor said he got this disease and its the worst of its kind and can never be cured. Please also tell me what type that is please.
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