This is a big word that is hard to pronounce, so let me break it down for you. Spondylo is a Greek word for spine and listhesis means to slip. This is not a slipped disc, rather it refers to one vertebral body slipping forward on another so that two segments of the spine are out of alignment.
This occurs primarily under two circumstances.
- Most commonly it occurs in patients beyond middle age and is referred to as degenerative spondylolisthesis. This is the result a combination of disc degeneration and facet arthritis.
- The other circumstance occurs much earlier in life, often starting in adolescence, and becoming symptomatic in early adulthood. This is referred to as spondylolytic (or Isthmic) spondylolisthesis. You can see from the first term that it refers to the spine but the second part of that word, -lysis, means “to cut”. This really refers to a bony defect in the back of your spine that makes the spine a little bit unstable and allows one bone to slip forward on the other.
In both cases the result is the same. The symptoms usually always include back pain but often include leg pain that radiates to the foot (or both feet). Leg pain can actually be the predominant symptom and often leads to the first doctor visit. This is because leg pain, which is actually nerve pain, is harder to tolerate than back pain. This results from the bones being out of alignment which leads to pinching of nerves.