Isthmic spondylolisthesis is one of the six common types of this spinal condition. This particular type is present in a child (approximately 5 to 7 years of age); however, the symptoms do not typically develop until adulthood.
Isthmic Spondylolisthesis Definition
This condition occurs in the pars interarticularis part of your spine, which is a narrow area (isthmus) between the upper and lower articular processes. Isthmic spondylolisthesis is caused by healed or unhealed stress fractures that are surrounded by fibrous tissues. It occurs when the vertebra slips forward over the lower vertebra over a period of time.