Spine
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Comparative Study
The response of the nucleus pulposus of the lumbar intervertebral discs to functionally loaded positions.
Asymptomatic volunteers underwent magnetic resonance imaging to investigate how different positions affect lumbar intervertebral discs. ⋯ These results support for the first time the validity of clinical assumptions about disc behavior in functional positions: sitting postures may increase risk of posterior derangement, and prone and supine may be therapeutic for symptoms caused by posterior disc displacement.
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Comparative Study
Comparison of segmental pedicle screw instrumentation versus anterior instrumentation in adolescent idiopathic thoracolumbar and lumbar scoliosis.
A retrospective study. ⋯ Surgical correction of both the frontal and sagittal plane deformity are comparable to anterior instrumentation. Shorter lengths of surgery and hospital stay are the potential benefits of posterior surgery. Posterior segmental pedicle screw instrumentation offer significant advantages and is a viable alternative to standard anterior instrumentation in idiopathic thoracolumbar and lumbar scoliosis.
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Cadaveric biomechanical study and retrospective chart review. ⋯ Segmental fixation of burst fractures with screws at the level of the fracture offers improved biomechanical stability. Theoretically, segmental fixation provides for additional fixation points that may aid in fracture reduction and kyphosis correction. This specific parameter is not evaluated in this study but will be an important outcome measure for a planned randomized controlled trial.
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A retrospective review of children with neuromuscular scoliosis treated at our institution with posterior spinal fusion and instrumentation including iliac screws. ⋯ The use of screw fixation in the ilium as a means of spinopelvic anchorage is safe and effective in the treatment of neuromuscular scoliosis. The use of 2 screws in each iliac wing provides more stable fixation with fewer implant-related complications than using a single screw.