Risk factors and clinical significance of posterior slip of the proximal vertebral body after lower lumbar fusion.

Background: Adjacent segment disease (ASD) after fusion surgery is frequently manifests as a cranial segment instability, disc herniation, spinal canal stenosis, spondylolisthesis or retrolisthesis. The risk factors and mechanisms of ASD have been widely discussed but never clearly defined.

Aim: To investigate the risk factors and clinical significance of retrograde movement of the proximal vertebral body after lower lumbar fusion.

[Effect of 3D printing technology on pelvic fractures:a Meta-analysis].

Objective: To evaluate the effect of 3D printing technology applied in the surgical treatment of pelvic fractures through the published literatures by Meta-analysis.

Methods: The PubMed database, EMCC database, CBM database, CNKI database, VIP database and Wanfang database were searched from the date of database foundation to August 2017 to collect the controlled clinical trials in wich 3D printing technology was applied in preoperative planning of pelvic fracture surgery. The retrieved literatures were screened according to predefined inclusion and exclusion criteria, and quality evaluation were performed.

[Correlation between the shifting of medulla oblongata and cerebellum and syrinx resolution after posterior fossa decompression in Chiari malformation].

Objectives: To evaluate the changes of the position of medulla oblongata and cerebellum following posterior fossa decompression (PFD), and to investigate their influences on the prognosis of the syringomyelia in adolescents with Chiari malformation (CM).

Methods: A retrospective review was performed on all CM patients between September 2006 and September 2011. A subset of 46 patients, including 25 male and 21 female patients, was finally enrolled according to the inclusion criteria.