| | Lumbar degenerative disc disease |
 | | Despite its rather dramatic label, degenerative disc disease is fairly common, and it is estimated that at least 30% of people aged 30-50 years old will have some degree of disc space degeneration, although not all will have pain or ever receive a formal diagnosis. |
 | | Disc degeneration is actually quite common among people who have no pain or other symptoms, so the patient’s history and physical examination are an essential part of the diagnosis. |
 | | The theory is that replacing the disc, instead of fusing the disc space together, maintains more of the normal motion in the lumbar spine, thereby reducing the chance that adjacent levels of the spine will break down due to increased stress. |
| www.spine-health.com /topics/cd/overview/lumbar/young/degen01.html (1312 words) |