How can I tell where the damage is in the hub?
Hi you say this is the second time it has happened , did the axle snap/break on the previous occasion ? is it a mountain bike ? does it take a bit of hammering ?

if the they are cartridge bearings ,you shouldn't need a new wheel ,just a couple of new cartridge bearings ,and an axle . just take what's left of the bearing cases , get a ruler , measure inner ,outer and width , you''ll probably get a couple new for a fiver on e bay, then measure the length of the axle ,if you can source the specs for the bike , even better ,should state it. then the thickness of the axle(9,9.5,10 mm ),you might have to buy an old school axle with cones, but you can just use the axle ,stick it all back together. good as new .  fixed for under a tenner  . p.s if it is taking a lot of stress ,go for a solid axle over quick release,plus you have the added bonus of your wheels not getting nicked if the thief hasn't brought a spanner he he