Aguilar AMA, de la Torre GDM, Ortiz RF, González HFJ, Ramírez CG

Language: Spanish
References: 14
Page: 208-212
PDF size: 162.75 Kb.

ABSTRACT

Introduction. Isthmic spondylolisthesis is caused by a failure of the pars interarticularis that allows the vertebrae above, along with the pedicles and superior articular facet, moves forward, leaving behind part of the posterior arch, i.e. the lower veneers, the boards and the corresponding spinous process of the same vertebra. He has received various classifications according to the degree of displacement, for which one of the most widely used is the Meyerding classification which provides the displacement according to the percentage of vertebral body surface that slides on the bottom immediately. According to the literature, the lumbar spine begins to be unstable when the anteroposterior displacement of one vertebra in relation to the next exceeds 4.5 mm or 15% of the anteroposterior radiograph of the vertebral body at rest. Also, the column is unstable when a relative displacement of the same rank above, comparisons between two films a rebound and another in full flexion. Objectives. Assess the degree of instability according to White and Panjabi criteria and comparative test the effects of including measures supine. Material and methods. We performed a study that included patients with isthmic spondylolisthesis from the outpatient service of Spine surgery at Hospital Juarez de Mexico in the period May 2010 to April 2011. Results. We studied 35 patients from the outpatient orthopedics at the Hospital Juarez de Mexico, diagnosed with lumbar isthmic spondylolisthesis instability according to the range of movement between the lateral flexion and extension, the difference between two projections, so we have that in 3 of the 35 cases the criterion of instability with a difference greater than 15%. With a range of average displacement of 4.94%, the range of flexed projection and the projection lying obtain a travel range of 10.74% average, so that cases of instability increase significantly. Conclusions. In assessing the range of maximum displacement, which included the 35 cases the difference between bending and lying down. In this analysis we can say that on average we obtained a shift of 10.74% and individually, the number of cases of instability increased significantly to a total of 12.

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