[CentOS] Recover rpm DB corrupted by disk failure?

Over the weekend my workstation (still on CentOS 3) started showing
SMART errors, so we shut it down and moved everything onto a new
drive.  On reboot, the RPM database reports as corrupted and "rpm
--rebuilddb" segmentation faults.

Is there any reasonable way to recover from this, short of a complete
reinstall?  The machine is otherwise up though it's quite likely some
files have been lost.