Extract Index DLL when it corrupted ?

 Hi all,

   I can create a test case to make corrupt data block for segment type but can't for index type.

   Follow MOS 28814.1 , section 4B about recreating index, it's said that:

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   CREATE INDEX <index_name> .. with appropriate storage clause

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I can extract index DLL (438143.1) :

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select dbms_metadata.get_ddl('INDEX', 'EMP_EMAIL_UK', 'HR') from dual;

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But if index EMP_EMAIL_UK corrupted, how I can extract DLL such command above ??