Orthopedic Care and Consultation
Spondylolysis is defined as a bony defect in the pars interarticularis of a vertebral arch.
When this defect is bilateral, the anterior and posterior portion of the neural arch separate. The inferior articular
processes, lamina, and spinous process no longer remain connected to the superior articular processes, pedicles, and vertebral body.
Because of this discontinuity spondylolisthesis may result.
The Pars Interarticularis is a special region of the lamina between the superior and inferior articular processes.
The pars interarticularis, pars for short, is the part of vertebra located between the inferior and superior articular processes of the facet joint.
This is weakest part of the lamina and a fracture or congenital anomaly of the pars may result in a Spondylolisthesis.
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