Spine
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A cross-sectional study on young adults. ⋯ LBP does not seem to be associated with maximal isometric trunk muscle strength or body sway in young adults.
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A retrospective study of complications with minimal 5-year follow-up of 50 adults with scoliosis with fusion from T10 or higher to S1. ⋯ Long fusions to the sacrum in adults with scoliosis continue to have a high complication rate. As compared to the original publications in the 1980s (Kostuik and Hall, Spine 1983;8:489-500; Balderston et al, Spine 1986;11:824-9) the more recent articles have shown a reduction, but not elimination of the pseudarthrosis problem using segmental instrumentation and anterior fusion of the lumbar spine coupled with structural interbody grafting at L4-L5 and L5-S1. Two-year follow-up is inadequate as pseudarthrosis and painful implants often are detected later. Only 3 of the 12 patients with pseudarthrosis were detected within the first 2 years after surgery.
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Comparative Study
Angular stable anterior plating following thoracolumbar corpectomy reveals superior segmental stability compared to conventional polyaxial plate fixation.
Biomechanical in vitro testing of primary and secondary stability in 12 human thoracolumbar spinal specimens using a spine simulator. ⋯ Anterior angular stable fixation showed higher primary and secondary stability following thoracolumbar corpectomy. In specimens with lower BMD the use of angular stable systems substantially increased stability. Angular stable systems, however, differ in the way of construct failure.
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Comparative Study
Revision of loosened iliac screws: a biomechanical study of longer and bigger screws.
The present study compared the biomechanics of 2 revision iliac screws: longer and bigger screws, on human cadaveric pelves. ⋯ Iliac screws are susceptible to loosening under cyclic loading due to the cancellous bone structure surrounding the screw body. Experimental data showed that the bigger revision iliac screw resists loosening better than the longer screw and the primary screw. Thus, the bigger revision screw is favored if the patient's anatomy allows such operation.
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Multicenter Study Clinical Trial
Kinetics of regression of sciatica and pain in the low back after lumbar macrodiscectomy in human immunodeficiency virus carriers.
Prospective longitudinal clinical study. ⋯ At 3 months, sciatica relief (VAS <4) was recorded in 66.6% of HIV positive patients and in 70.6% of HIV negative patients. Relief of pain in the low back (VAS <4) was respectively 50.0% and 55.1% in both groups. The pattern of pain regression during the follow-up period was similar in both groups.