Spine
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A new type of composite device with a similar structure to a natural lumbar intervertebral disc was modeled, and its mechanical interaction with a L3-L5 lumbar spine segment was studied by a finite element analysis. ⋯ By using numerical methods, this study allows prediction of the static mechanical behavior of a new device within a lumbar spine structure, which appears very useful for preclinical study.
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Spine loads associated with lifting a 9-kg weight were estimated at three torso flexion angles (0 degrees, 22.5 degrees, and 45 degrees), and lumbosacral motion segments were cyclically loaded using these loads until failure or to a maximum of 10,020 cycles. ⋯ Fatigue failure of spinal tissues can occur rapidly when the torso is fully flexed during occupational lifting tasks; however, many thousands of cycles can be tolerated in a neutral posture. Future lifting recommendations should be sensitive to rapid development of fatigue failure in torso flexion.
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To investigate the effects of biologic age, as well as chronologic age, on the vertebral ultimate load (strength) and risk score of vertebral fracture (Phi) between the genders. ⋯ Our findings emphasize the importance of Phi, which considers BMC, bone size, body weight, body height, and weight lifted, for evaluating a more individualized risk of spine fracture in elderly men and postmenopausal women. The Phi increased more prominently with lifting weight and increased with aging only in the early postmenopausal females. The study showed that a combination of bone mass and anthropometric parameters provides a more individualized assessment of fracture risk than bone mineral density alone.
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Details of presentation and approach to the treatment of scoliosis in a case of a Rigid Spine Syndrome (RSS). ⋯ The chromosomal bases of CMD and characteristic features of RSS, including diagnostic tests, have been reviewed. Surgical intervention with spinal deformity fusion, correction, and instrumentation is indicated in RSS with progressive spinal imbalance not responding to conservative therapy is safe and can give promising results.
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A report of 3 cases of upper sacral tumors excised by occluding the abdominal aorta with a balloon dilation catheter (BDC). ⋯ To occlude the abdominal aorta with a BDC may effectively reduce intraoperative hemorrhage, thus assisting the surgeon in the complete and safe resection of upper sacral tumors.