When you are talking about repaired you mean with the Repair of MySQL or you just dumped the database and used a backup to restore/recreate it?
If it is the backup then the threads are gone if they were created after the time you took the backup.
Regarding the Repair function of MySQL I had seen in the past some corruption in the w3t_Users table of one of my boards and when I used the Repair function certain records were indeed missing (including one of my moderators <img src="https://www.ubbcentral.com/boards/images/graemlins/tongue.gif" alt="" />). So to the best of my knowledge the answer would be no (reluctantly)
