While uncommon, type VI, also known as iatrogenic spondylolisthesis, is caused by a weakening of the pars interarticularis often as the result of a laminectomy, a common spine surgery.
It’s important to note that spondylolisthesis should not be confused with spondylolysis.
Occasionally, a patient can slip their vertebrae and not feel any pain or numbness until years after the fact.
When it does occur, however, it often manifests itself as pain in the lower back or buttocks.
These fractures can lead to instability and cause a disc to slip.
Type VI spondylolisthesis is the result of a surgery that causes a vertebra to slip forward.Aging and disc degeneration are the main culprits in type III spondylolisthesis.Over time, vertebrae discs naturally begin to lose water as their outer wall, known as the annulus, weakens.Facet joints act much like hinges and run in pairs down the length of the spine, one on each side.They are largely responsible for stability and movement within the spine; they keep the bones in the spine lined up, while still allowing them to move and remain flexible.Type II spondylolisthesis can be divided into three individual subcategories.Type II A: This form of Type II spondylolisthesis commonly occurs in people who engage in high intensity, contact sports like football, gymnastics and weightlifting and have multiple microfractures in the pars interarticularis due to overstretching (hyperextension) and overuse.Instead, new bone grows in an attempt to heal the damage which causes it to stretch.A longer pars can cause the vertebrae to slip forward.Spondylolisthesis occurs when one of the lumbar vertebrae in the spine moves forward relative to the vertebrae below it, causing pain or weakness.The most common area for spondylolisthesis to occur is within the bottom level of the lumbar spine between L5-S1.