Hi Sonj,

I have recently submitted an article on low back pain prevention. This includes information on lumbar disc injuries.
Click on the link to see the article.
Also check out the website of our Physiotherapy Mt Wellington clinic.
Hope these few tips help.
Unfortunately this maybe a little late as I realise your original post was from 2007.
Anyway, if you have any questions feel free to email me. I may have some more resources on low back pain.

Alex