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Pars for short, is the part of vertebra located between the inferior and superior articular processes of the facet joint.
In the transverse plane, it lies between the lamina and pedicle.
In the axial view, it is the bony mass between the facets that is anterior to the lamina and posterior to the pedicle.
It is abnormal in spondylolysis, either due to fracture or congenitally.
Bilateral C2 pars fractures are known as the hangman’s fracture.
Stress fractures of the pars interarticularis are known to be associated with playing sports.
Patients with spina bifida occulta have an increased risk for spondylolysis.[5]