Spine
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Comparative Study
Traumatic instabilities of the cervical spine caused by high-speed axial compression in a human model. An in vitro biomechanical study.
Traumatic injury of the cervical spine was produced on human cadavers and evaluated with instability tests and radiographs. ⋯ The injury patterns of the cervical spine were associated with impact energy, and a high level of impact energy could produce either three-column injury or anterior middle-column injury. Instabilities of the cervical spine caused by compressive trauma increased with the level of impact energy. The neutral zone was more sensitive than the range of motion in representing spinal instability, whereas instability testing was more sensitive than radiographs in evaluating traumatic injury of cervical spine.
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Comparative Study
Biomechanical analysis of anterior versus circumferential spinal reconstruction for various anatomic stages of tumor lesions.
Spinal reconstruction procedures for metastasis evaluated biomechanically using human cadaver specimens. ⋯ For corpectomy or subtotal spondylectomy, anterior reconstruction alone can provide stiffness equivalent to circumferential reconstruction. However, total spondylectomy significantly reduces the anterior reconstruction stiffness, suggesting the need for combined anterior and posterior procedures.
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Comparative Study
Effectiveness of Waddell's nonorganic signs in predicting a delayed return to regular work in patients experiencing acute occupational low back pain.
Consecutive case series. ⋯ Patients with acute, occupational low back pain exhibiting Waddell's nonorganic signs had a four times lengthier time for return to unrestricted, regular work and a greater use of physical therapy and lumbar computed tomographic scans.
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Case report of a 49-year-old woman with a lower thoracic disc herniation mimicking acute lumbosacral radiculopathy. ⋯ A case of thoracic disc herniation mimicking an acute lumbosacral radiculopathy is presented. Compression of the lumbosacral spinal nerve roots at the lower thoracic level after exit from the lumbar enlargement may be the mechanism for this unusual presentation.
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Comparative Study
The use of coralline hydroxyapatite with bone marrow, autogenous bone graft, or osteoinductive bone protein extract for posterolateral lumbar spine fusion.
A posterolateral lumbar arthrodesis animal model using coralline hydroxyapatite as a bone graft substitute. ⋯ These data indicate that coralline hydroxyapatite with bone marrow was not an acceptable bone graft substitute for posterolateral spine fusion. When combined with autogenous iliac crest bone graft-coralline hydroxyapatite served as a graft extender yielding results comparable to those obtained with autograft alone. Coralline hydroxyapatite served as an excellent carrier for the bovine osteoinductive bone protein extract yielding superior results to those obtained with autograft or bone marrow.