When this is breached, the upper facet joint may no longer be able to hold the vertebra in place against the downward force of body weight and forward/downward slippage occurs. Spondylolisthesis commonly occurs due to a fracture or defect in the pars interarticularis, the narrowest part of the posterior vertebral arch between the upper and lower facet joints. Many cases of spondylolisthesis are asymptomatic.Traumatic, metastatic and dysplastic spondylolistheses are relatively rare.
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