Spine
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Biomechanical effect of implantation of an artificial disc (AD) was investigated using the nonlinear three-dimensional finite element model of L4-L5. The SB CHARITE and the Prodisc were chosen as the representative prosthesis of unconstrained and constrained ADs (UADs and CADs) and compared with the intact human intervertebral disc. ⋯ By the result of this study it is obvious that implanted segment with AD has large range of motion and suffers from increased loading to surrounding bone and ligaments. The UAD has larger range of motion but exert less loading to the implanted segment than the CAD. It seems that the mobile center of rotation of the UAD has the ability to lessen the facet contact force and stress on the vertebral body.
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Morphologic study of 500 human adult atlases, 256 atlases of nonhuman adult primates representing 37 genera, and 25 human atlases of newborns and young individuals from birth to 3 years of age. ⋯ The anteriorly unclosed transverse foramen of the atlas seems to be the result of an evolutionary tendency characteristic of hominoids within primates and could be interpreted as a shared derived character (i.e., synapomorphy) and as the persistence in adults of a juvenile pattern (i.e., paedomorphosis). It must not be interpreted as a pathologic erosion or destruction but as being a simple normal variant.
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Meta Analysis
Percutaneous treatment of vertebral compression fractures: a meta-analysis of complications.
This study performs a meta-analysis to compare complication rates from vertebroplasty (VP) and kyphoplasty (KP). ⋯ VP and KP are 2 minimally invasive procedures that have been shown to be effective in the treatment of symptomatic vertebral compression fractures. Although the incidence of adverse events for both VP and KP are low, it appears that VP is associated with a statistically significant increased rate of procedure-related complications and cement extravasation (symptomatic and asymptomatic). Future prospective studies with large patient enrollment will be needed to further validate the finding of this meta-analysis.
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Translation, cross-cultural adaptation, and validation were performed on the Chinese version of the Oswestry Disability Index (ODI). ⋯ The results showed that the translation and adaptation were successful. The SCODI has proven to be valid and reliable when used in the simplified Chinese speaking population.
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Evaluation of cervical spinal cord (CSC) of patients with compressive myelopathy by magnetic resonance imaging (MRI) and high-resolution (18F)fluoro-deoxyglucose (18FDG) positron emission tomography (PET). ⋯ Our results showed that postoperative neurologic improvement in patients with cervical compressive myelopathy correlated with increased transverse area of the spinal cord, signal intensity change on both T1- and T2-weighted image, and the mean SUV.