The bone spur is part of the body’s response to increased forces being placed on the vertrebra at that level. The body lays down new bone formation to try to spread the forces out over a larger suface area and to help with stability. So, the bone spur occurs as a result of a problem at that area. Pretty common to find these as part of a disc problem or part of the degenerative process.
A bone spur on the anterior portion of the spine most likely is not a pain generator. The problem that caused it,however, can definitely generate pain. If the bone spur was on the posterior area, around the spinal canal or nerve foramen, then it would be more of an issue.
What kind of spinal stability program have you done?
If you are interested in learning about low back injuries and how to not only rehab one but also how to go about designing a workout program to decrease the injury risk, then I would suggest that you get a copy of Stuart McGill’s Ultimate Back Fitness and Performance book. You can get it from Dave Tate’s Elite Fitness Systems site (www.EliteFTS.com)