Fate of the Retained Acetabular Component During Revision Total Hip Arthroplasty: A Meta-Analysis and Systematic Review.

Background: The aim of this meta-analysis and systematic review is to estimate re-revision rates due to aseptic loosening of retained acetabular components after revision total hip arthroplasty.

Methods: PubMed, EMBASE, Cochrane Library, and Web of Science were searched until June 11, 2018. Data were extracted by 2 independent investigators and consensus was reached with the involvement of a third investigator.

Percutaneous kyphoplasty: Risk Factors for Recollapse of Cemented Vertebrae.

Introduction: Percutaneous kyphoplasty can offer pain relief and restoration of vertebral height immediately after the procedure; however, little is known about how many vertebrae recollapse during follow-up or why recollapse occurs. In the present study, we define recollapse of a treated vertebra, assess how common it is following percutaneous kyphoplasty, and investigate risk factors for the condition.

Methods: In total, 203 consecutive patients who underwent percutaneous kyphoplasty were reviewed after an average 12.

Mechanism of formation of intravertebral clefts in osteoporotic vertebral compression fractures: An in vitro biomechanical study.

Background Context: Intravertebral clefts (IVCs) are vacuum-like cavities commonly associated with osteoporotic vertebral compression fractures (OVCFs). IVCs promote cement leakage during kyphoplasty, suggesting a physical link with the basivertebral foramen, although this is uncertain.

Purpose: The present study aims to create IVCs in mechanical experiments on cadaveric spines in order to clarify their pathogenesis, structure, and links with the basivertebral foramen.

Trabecular Microstructure and Damage Affect Cement Leakage From the Basivertebral Foramen During Vertebral Augmentation.

Study Design: A prospective study on cadaver specimens.

Objective: To explore why cement leakage from basivertebral foramen (BF) easily occurs during vertebral augmentation procedures.

Summary Of Background Data: Type B (through BF, basivertebral foramen) cement leakage is the most common type after vertebral augmentation, but the mechanism of this is still controversial.

Mini-open Anterior Lumbar Interbody Fusion for Recurrent Lumbar Disc Herniation Following Posterior Instrumentation.

Study Design: A retrospective study.

Objective: The aim of this study is to evaluate, clinically and radiographically, the efficacy of mini-open retroperitoneal anterior lumbar discectomy followed by anterior lumbar interbody fusion (ALIF) for recurrent lumbar disc herniation following primary posterior instrumentation.

Summary Of Background Data: Recurrent disc herniation following previous disc surgery occurs in 5 to 15% of cases.

Biomechanical properties of lumbar endplates and their correlation with MRI findings of lumbar degeneration.

How stiffness and strength of the human lumbar endplate vary with location, spinal level, and its correlation with MRI findings of lumbar degeneration, has not been reported in detail. 27 lumbar spines (16 male, 11 female, 31-49yrs) were harvested from cadavers without history of lumbar lesion or trauma. Disc and endplate degeneration was evaluated from MRI.

Correlation between biomechanical properties of the annulus fibrosus and magnetic resonance imaging (MRI) findings.

Purpose: To investigate the regional tensile properties of human annulus fibrosus (AF) and relate them to magnetic resonance imaging (MRI) findings.

Methods: 44 human cadaveric lumbar spines were harvested (24 male, 20 female, aged 25-64 years). MRI was used to identify Pfirrmann grade of disc degeneration, and Modic changes (MCs).

Comparison of modic changes in the lumbar and cervical spine, in 3167 patients with and without spinal pain.

Background Context: There are few comparisons of Modic changes (MCs) in the lumbar and cervical spine.

Purpose: Compare the prevalence of MCs in the lumbar and cervical spine, and determine how MC prevalence depends on spinal pain, age, disc degeneration, spinal level, and the presence or absence of kyphosis.

Study Design: Retrospective clinical survey.

[Locking plate external fixator for the treatment of middle and distal tibial fractures].

Objective: To evaluate the effectiveness of locking plate external fixator in treating middle and distal tibial fractures.

Methods: From January 2010 to January 2013,18 patients suffered from middle and distal tibial fractures were treated by locking plate external fixator,including 11 males and 7 females, with an average age of 53.5 (ranged from 13 to 80) years old,the course of disease ranged from 2 h to 3 d.

Spontaneous resorption of lumbar disc herniation is less likely when modic changes are present.

Study Design: A retrospective survey on 85 consecutive patients with primary single-level lumbar disc herniation (LDH).

Objective: To investigate associations between Modic changes (MCs) and the likelihood of resorption of herniated lumbar intervertebral discs.

Summary Of Background Data: Spontaneous resorption of LDH has been demonstrated, whereas the mechanisms are unclear.

Basivertebral foramen could be connected with intravertebral cleft: a potential risk factor of cement leakage in percutaneous kyphoplasty.

Background Context: Among different types of cement leakage in percutaneous kyphoplasty (PKP) for osteoporotic vertebral body compression fractures, leaks into the spinal canal are considered to be the most common complication. One potential structure causing this type of cement leakage is the potential connection between the basivertebral foramen and the intravertebral cleft, which is revealed clearly on magnetic resonance (MR) images, but is often ignored in the literature.

Purpose: The purpose of this study is to assess the incidence rate of different types of cement leakage in PKP with or without intravertebral clefts and to determine whether the basivertebral foramen could be connected to the intravertebral cleft.