Hi Farsad, welcome...We are an osteoporosis site and don't handle orthopedic questions.  Since you've had this test done already can you see the Dr. that ordered it and ask what the medical recommendation is?  The Dr. needs to see the actual film (usually) and then the written report and will give you the diagnosis. 

From my years of experience with spinal problems all I can add is a limbus vertebra is one that involves a anterior herniated disc, and subluxation can be a incomplete or partial dislocation at L5/L4 level, but verify this to be sure.  Talk to your Dr. about treatment; but I wouldn't automatically assume it entails surgery, unless that is what the Dr. feels is warranted.

Herniated Disc definition/explanation:  http://www.medterms.com/script/main/art.asp?articlekey=10661

Good luck...