Cervical spondylolysis in a child: a case with hypermobility.

Background Context: Cervical spondylolysis (CS) is a rare disorder involving a cleft in the articular mass, at the junction of the superior and inferior facet joints, and often a complex malformation of the posterior elements of the vertebra. The most commonly affected level is the sixth cervical vertebra. Most of the cases are adults.

Influence of the sagittal anatomy of the pelvis on the intercrestal line position.

Background And Objective: The line joining the two iliac crests is classically regarded as the anatomical landmark determining the inter-vertebral space L4-L5 for the spinal punctures. Its variability has been reported but never related to predictive clinical anatomic factors identifying patients groups in which there is increased risk of miscalculation of the spinal level.

Methods: Two sagittal pelvic anatomical angles, called 'pelvic incidence' and 'pelvic lordosis' were measured on lateral X-rays of the pelvis of 132 normal individuals and 49 spondylolysis patients.