Spine
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In vivo measurements and model studies are combined to investigate the role of lumbar posture in static lifting tasks. ⋯ Alterations in the lumbar lordosis in lifting resulted in significant changes in the muscle forces and internal spinal loads. Spinal shear forces at different segmental levels were influenced by changes in both the disc inclinations and extensor muscle lines of action as the posture altered. Considering internal spinal loads and active-passive muscle forces, the current study supports the freestyle posture or a posture with moderate flexion as the posture of choice in static lifting tasks.
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This study was designed to investigate the difference of rib length of idiopathic scoliosis using experimentally induced scoliosis by pinealectomy in chickens. ⋯ Our results indicated that rib length was not related to the experimental scoliosis examined in this study. Further study is encouraged to investigate if the asymmetric rib length plays a role in causing or promoting other types of scoliosis, especially in primate or human idiopathic scoliosis.
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Prospective consecutive series. ⋯ Even if the clinical expectations were met, some patients were still dissatisfied. Patients with spinal stenosis (Group 2) seem to have more unrealistic expectations than patients with disc herniation (Group 1).
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Comparative Study
A new stand-alone anterior lumbar interbody fusion device: biomechanical comparison with established fixation techniques.
Established lumbar fixation methods were assessed biomechanically, and a comparison was made with a new stand-alone anterior lumbar interbody cage device incorporating integrated anterior fixation. ⋯ The Test-device alone provided similar and the Test-device and TS higher stability than the pedicle screw constructs evaluated. These results support progression to clinical trials using the Test-device as a stand-alone implant.
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Comparative Study
Symptomatic and asymptomatic movement coordination of the lumbar spine and hip during an everyday activity.
This experimental study analyzed the movements of the lumbar spine and hip while putting on a sock. ⋯ Changes in the lumbar and hip kinematics when putting on a sock were related to back pain and limitation in SLR. Low back pain will affect lumbar-hip coordination.