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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Comparative Study
Use of walking data in assessing operative results for cervical spondylotic myelopathy: long-term follow-up and comparison with controls.
Retrospective case-control study. ⋯ Surgical decompression is beneficial in the treatment of CSM. Improvements were generally seen by 6 months from operation. Older patients and greater degrees of myelopathy were not associated with a worse outcome, suggesting surgery should not necessarily be discouraged in such patients.
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Retrospective case series of magnetic resonance imaging (MRI) findings in patients with presumed infantile idiopathic scoliosis (IIS). ⋯ This study represents the largest evaluation of intraspinal anomalies in IIS to date. Our patient population exhibited a smaller percentage (13%) of neural axis abnormalities than previously reported. On the basis of these findings, the close observation may be a reasonable alternative to an immediate screening MRI in patients presenting with presumed IIS and a curve >20 degrees.
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Case report. ⋯ By using surgical resection and hematoma evacuation, good outcome could be achieved for spinal osteoblastoma complicated with epidural hematoma.