Development and Validation of a Risk Prediction Model for Pseudarthrosis Following Transforaminal Lumbar Interbody Fusion: A Retrospective Analysis.

Background: Pseudarthrosis is a common complication of transforaminal lumbar interbody fusion (TLIF) that can affect the long-term prognosis and increase revision surgery risk. Therefore, it is crucial to investigate the risk factors associated with pseudarthrosis and develop a predictive model.

Methods: Patients who underwent TLIF at a single hospital between January 2019 and June 2021 were included.

Effect of Insertional Direction of Pedicle Screw on Screw Loosening: A Biomechanical Study on Synthetic Bone Vertebra under a Physiology-like Load.

Objectives: It is now understood that pedicle screw loosening at the implant-bone interface can lead to poor screw-bone interface purchase and decreased fixation stability. Previous biomechanical tests used cadaveric vertebrae and pull-out or torque loads to assess the effect of the insertional direction of pedicle screws on screw loosening. However, these tests faced challenges in matching biomechanical differences among specimens and simulating in vivo loads applied on pedicle screws.

Correlation between direction of pedicle screw and restoration of lumbar degenerative scoliosis in degenerative lumbar spondylolisthesis: a retrospective study.

Background: Inferior clinical outcomes have been reported in patients with degenerative lumbar spondylolisthesis (DLS) accompanied by lumbar degenerative scoliosis, but little attention has been paid to its radiologic assessment or preoperative planning. The aim of this study was to analyze the effect of transforaminal lumbar interbody fusion on patients with DLS and lumbar degenerative scoliosis and explore the surgical aspects benefiting the restoration of lumbar degenerative scoliosis.

Methods: All patients with DLS and lumbar degenerative scoliosis undergoing single-level unilateral transforaminal lumbar interbody fusion surgery between July 1, 2015, and April 30, 2021, were screened in this retrospective cohort study.

Lumbar segment-dependent soft tissue artifacts of skin markers during weight-bearing forward-Backward bending.

Traditional optical motion capture (OMC) with retroreflective markers is commonly used to measure joint kinematics but was also reported with unavoidable soft tissue artifacts (STAs) when quantifying the motion of the spine. Additionally, the patterns of the STA on the lumbar spine remain unclear. This study aimed to 1) quantify the STAs of the human lower back in three-dimensional directions during weight-bearing forward-backward bending and 2) determine the effects of the STAs on the calculated flexion angles between the upper and lower lumbar spines and adjacent vertebrae by comparing the skin marker (SM)- and virtual bone marker (VM)-based measurements.

Is reduction or arthrodesis in situ the optimal choice for adolescent spondylolisthesis?-a systematic review and meta-analysis.

Background: Controversy remains about the choice of reduction or arthrodesis in situ for surgical management of adolescent spondylolisthesis, while no systematic review and meta-analysis were performed to determine which one is the optimal surgical choice. The study aims to compare outcomes of the two surgical strategies for adolescent spondylolisthesis.

Methods: A comprehensive search was performed through PubMed, Web of Science, Cochrane Library, Embase, OVID/MEDLINE, CBM, CNKI, and Wanfang with a cutoff date of May 21st, 2021.