Influencia del balance sagital sobre los cambios degenerativos de la columna vertebral (I) / Influence of Sagittal Balance on Degenerative Changes in the Spine (I)

RESUMEN Los estudios han determinado la importancia del balance sagital en el desarrollo de entidades degenerativas de la columna vertebral, fundamentalmente de la región lumbar; así como en los resultados de las intervenciones quirúrgicas de estas afecciones. Es propósito de este trabajo revisar y discutir los conceptos actuales sobre la estabilidad sagital vertebral y lumbar, así como su influencia sobre el proceso degenerativo espinal, de manera fundamental sobre estenosis, espondilolistesis y escoliosis degenerativa. Existen parámetros pélvicos y parámetros espinales que tienen que tomarse en cuenta para la determinación preoperatoria y posoperatoria del equilibrio sagital. El equilibrio sagital se clasifica en: balance normal, balance compensado y desbalance. Esto tiene gran importancia para llegar al diagnóstico correcto y aplicar el tratamiento quirúrgico necesario(AU)

ABSTRACT Studies have determined the importance of sagittal balance in the development of degenerative entities of the spine, mainly in the lumbar region; as well as in the results of the surgical interventions of these affections. The purpose of this paper is to review and discuss current concepts on vertebral and lumbar sagittal stability, as well as its influence on the degenerative spinal process, basically on stenosis, spondylolisthesis and degenerative scoliosis. There are pelvic parameters and spinal parameters that have to be taken into account for the preoperative and postoperative determination of sagittal balance. Sagittal balance is classified into normal balance, compensated balance and imbalance. This is very important to reach the correct diagnosis and apply the necessary surgical treatment(AU)

Significance of the Pars Interarticularis in the Cortical Bone Trajectory Screw Technique: An In Vivo Insertional Torque Study

STUDY DESIGN: Retrospective study. PURPOSE: Cortical bone trajectory (CBT), a more medial-to-lateral and shorter path than the traditional one for spinal fusion, is thought to be effective for severely degenerated vertebrae because screws are primarily stabilized at the posterior elements. We evaluated the efficacy of this approach through in vivo insertional torque measurement. OVERVIEW OF LITERATURE: There has been only one prior in vivo study on CBT insertional torque. METHODS: Between January 2013 and April 2014, a total of 22 patients underwent posterior lumbar fusion using the CBT technique. The maximum insertional torque, which covers the radial strength needed for insertion, was measured for 113 screws, 8 of which were inserted for L5 spondylolysis. The insertional torque for cases with (n=8) and without (n=31) spondylolysis of L5 were compared using one-way analysis of variance (ANOVA). To evaluate vertebral degeneration, we classified 53 vertebrae without spondylolysis by lumbar radiography using semiquantitative methods; the insertional torque for the 105 screws used was compared on the basis of this classification. Additionally, differences in insertional torque among cases grouped by age, sex, and lumbar level were evaluated for these 105 screws using ANOVA and the Tukey test. RESULTS: The mean insertional torque was significantly lower for patients with spondylolysis than for those without spondylolysis (4.25 vs. 8.24 in-lb). There were no statistical differences in insertional torque according to vertebral grading or level. The only significant difference in insertional torque between age and sex groups was in men <75 years and women ≥75 years (10 vs. 5.5 in-lb). CONCLUSIONS: Although CBT should be used with great caution in patient with lysis who are ≥75 years, it is well suited for dealing with severely degenerated vertebrae because the pars interarticularis plays a very important role in the implementation of this technique.

Fixation and posterior bone fusion for surgical treatment of the lumbar vertebral slip due to degeneration

11 patients with the lumbar vertebral slip due to degeneration (male: 1; female: 10) ages of 39-70 received the surgical treatment by using fixation and posterior bone fusion. The results have shown that the average time for monitoring was 23.27 months; pain free (90.91%) pain relief (9.09%), out door normal walking (90.91%) home walking (9.09%). Technique of bone fusion: postero lateral fusion (81.82%), fusion of bony head (70%) posterobalteral fusion and fusion of bony head (70%), without fusion of bony head 30% and without posterolateral (18.18%). The conclusion: the fixation with instrument and bone fusion for treatment of lumbar vertibral slip due to the degeneration found the good and encoraged results