Degenerative Spondylolisthesis
Each level of the spine is composed of three parts: the intervertebral disc space anteriorly and two paired posterior facet joints. The discs are located in between the vertebrae and act as a "shock absorber" while the facet joints allow the right amount of motion.
As the facet joints age, they can weaken and allow the spine to bend forward too much. This can allow one vertebral body in the lower spine to slip forward on the other. This condition is called degenerative spondylolisthesis.
Degenerative spondylolisthesis occurs most frequently in adults older than 65. Females are more susceptible to the condition.
A degenerative spondylolisthesis can result in back pain and sciatica (pain and possibly numbness or weakness in the legs).
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