Spine
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Comparative Study
Analysis of pedicle and translaminar facet fixation in a multisegment interbody fusion model.
This is a biomechanical study. We compared pedicle screws and translaminar screws in the setting of multisegment interbody fusions. ⋯ This study supports the omission of the middle segment screws in a 2-level interbody fusion. In addition, translaminar screws are similar to pedicle fixation in a 2-level interbody lumbar fusion.
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A prospective, case-control design. ⋯ DFV was useful for discriminating between individuals with and without LBP based on kinematic parameters. Disruptions in how the motion occurred during midrange motions were more diagnostic for LBP than range of motion variables. Cross validation of the model is required.
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Comparative Study
Three-dimensional kinetics of the lumbar spine and hips in low back pain patients during sit-to-stand and stand-to-sit.
Experimental, biomechanical study to determine the kinetics of the lumbar spine and hips during sit-to-stand and stand-to-sit. ⋯ Back pain subjects exhibit compensatory movements and altered load sharing strategies during the sit-to-stand and stand-to-sit activities. Exercise therapy should take account of these changes so that the normal kinematic and kinetic characteristics of the spine and hips can be restored.
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Finite element study. ⋯ Combined moments seem to lead to higher stresses in the disc, especially posterolaterally. This region might be more susceptible to disc failure and prolapses. These results may help clinicians better understand the mechanical causes of disc prolapses and may also be valuable in developing preventive clinical strategies and postoperative treatments.