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Spondylolysis means a defect in the vertebral arch (pars inter-articularis or isthmus), and spondylolisthesis denotes forward displacement of a vertebral body relative to the vertebra below. The derangement occurs most frequently at the fifth lumbar vertebra.
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With the pars defect divides the vertebrainto an anterior part (vertebral body,pedicles, transverse processes, andsuperior articular facet) and aposterior part (inferior facet, laminae, and spinous process). The anterior part slips forward, leavingthe posterior part behind. As a result, the spinal canal elongates in its anteroposterior dimension, sothat spinal canal stenosis is uncommon with isthmic spondylolisthesis. Grade I spondylolisthesis isoften asymptomatic, but with progressive anterior subluxation, the intervertebral disk and theposterior-superior aspect of the vertebral body below encroach on the superior portion of the neuralforamen. The foramen is also elongated in a horizontal direction and may have a bilobedconfiguration. Exuberant fibrocartilage at the pars pseudarthrosis can further compromise the neuralforamen and cause nerve root compression.
Spondylolysis and Spondylolisthesis usually cause no symptoms in children; however, many seek medical evaluation because of a postural deformity or gait abnormality. Pain most often occurs during the adolescent growth spurt and is predominantly backache, with only occasional leg pain. Symptoms are exacerbated by high activity levels or competitive sports and are diminished by activity restriction and rest. The back pain probably results from instability of the affected segment, and the leg pain is usually related to irritation of the L5 nerve root.
NYU Professor Julia Evergreen Keefer
Type I. Dysplastic: This type results from congenital abnormalities of the upper sacral facets or inferior facets of the fifth lumbar vertebra that allow slipping of L5 on S1. There is no pars interarticularis defect in this type. The sacrum is not strong enough to withstand the weight and stress. Thus, the pars and inferior facets of L5 are deformed. If the pars elongates, it is impossible to differentiate it by x-ray from the isthmic (type II b) Spondylolisthesis. If the pars separates, it becomes impossible to differentiate it by x-ray from the isthmic lytic (type II a) Spondylolisthesis. This type is also associated with sacral and neural arch deficiencies. It has a familial tendency.
This is an Anatomy and Kinesiology, not Physiology class
SpineInjury - Pars Defect and Spondylolisthesis ,Spine Injury - Pars Defect.
The diagnosis of spondylolysis is confirmed by the discovery of a pars defect on a.