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11.
Ping Zhao 《中国结合医学杂志》1995,1(3):197-200
AStudyonExtension-FlexionDynamicLumbarSpineRadiographsinPatientswithLumbarIntervertebralDiscHerniationAStudyonExtension-Flexi... 相似文献
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Effect of compressive follower preload on the flexion-extension response of the human lumbar spine. 总被引:5,自引:0,他引:5
Avinash G Patwardhan Robert M Havey Gerard Carandang James Simonds Leonard I Voronov Alexander J Ghanayem Kevin P Meade Thomas M Gavin Odysseas Paxinos 《Journal of orthopaedic research》2003,21(3):540-546
Traditional experimental methods are unable to study the kinematics of whole lumbar spine specimens under physiologic compressive preloads because the spine without active musculature buckles under just 120 N of vertical load. However, the lumbar spine can support a compressive load of physiologic magnitude (up to 1200 N) without collapsing if the load is applied along a follower load path. This study tested the hypothesis that the load-displacement response of the lumbar spine in flexion-extension is affected by the magnitude of the follower preload and the follower preload path. Twenty-one fresh human cadaveric lumbar spines were tested in flexion-extension under increasing compressive follower preload applied along two distinctly different optimized preload paths. The first (neutral) preload path was considered optimum if the specimen underwent the least angular change in its lordosis when the full range of preload (0-1200 N) was applied in its neutral posture. The second (flexed) preload path was optimized for an intermediate specimen posture between neutral and full flexion. A twofold increase in flexion stiffness occurred around the neutral posture as the preload was increased from 0 to 1200 N. The preload magnitude (400 N and larger) significantly affected the range of motion (ROM), with a 25% decrease at 1200 N preload applied along the neutral path. When the preload was applied along a path optimized for an intermediate forward-flexed posture, only a 15% decrease in ROM occurred at 1200 N. The results demonstrate that whole lumbar spine specimens can be subjected to compressive follower preloads of in vivo magnitudes while allowing physiologic mobility under flexion-extension moments. The optimized follower preload provides a method to simulate the resultant vector of the muscles that allow the spine to support physiologic compressive loads induced during flexion-extension activities. 相似文献
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A.P. Uzel R. Massicot P. Grignon V. Casoli 《Journal of orthopaedics and traumatology》2003,4(1):45-49
We report the case of a fracture separation of the articular pillar at the lower cervical spine. The trauma, following a
brass knuckles, repeats almost in an experimental way the rotation and extension mechanism given in literature for the genesis
of such injuries. From the admission in the orthopaedic service to the surgery, the development went in a characteristic way
towards a rotatory displacement.
Received: 12 July 2002, Accepted: 18 August 2002
Correspondence to: R. Massicot 相似文献
16.
目的探讨颈椎前路椎体次全切除钛网钉板植骨融合的临床效果。方法自2001年3月~2003年3月间应用颈前路椎体次全切除钛网植骨融合及钉板固定治疗颈椎管狭窄性疾病22例,其中4例患者行2椎体次全切除3节椎间隙减压手术。术后观察减压、固定、融合及神经功能恢复情况,并行X线摄片或CT扫描检查。结果患者获6~12个月随访,神经功能得到不同程度改善,无加重情况。椎间隙高度无丢失、无成角,均获得骨性融合。术后3d在颈围领固定下下床活动,4周后可恢复较轻工作。结论此术式可避免传统手术方法的缺点,即不取自体髂骨,融合率高,稳定性好,并减压彻底,疗效好,是一种值得推广的新技术。 相似文献
17.
Summary An anatomical study of the lumbar apophyseal joints was carried out to facilitate recognition of facet joint lesions, which we now examine routinely by percutaneous arthrography. Special attention was given to the configuration of the different compartments of the joint space and to its relationships with the contents of the intervertebral foramen. The abnormalities seen on lumbar facet joint arthrography are very varied; two major groups should be stressed: synovial fringe hypertrophy and pseudodiverticular synovial ectasia. The percutaneous approach to lumbar facet joint arthrography allows it to be used a therapeutic measure, with injection of anti-inflammatory drugs into the joint space, the beneficial effects of which were confirmed in our series. The precision, efficiency and cost-effectiveness of this outpatient technique justify and should encourage its more widespread application in the diagnosis and treatment of low back pain. 相似文献
18.
Abstract Whiplash injury of the cervical spine is a frequent issue in medical expertises and causes enormous consequential costs for
motor insurance companies. Some authors accuse posttraumatic changes of alar ligaments to be causative of consequential disturbances,
although biomechanical experiments achieve contradictory results and neuropsychiatric studies do not support this thesis.
MRI provides excellent visualization of alar ligaments. However, signal alterations of alar ligaments must be differentiated
from common normal variants. Functional MRI provides no diagnostic yield.
相似文献
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[目的]探讨头环牵引外固定架治疗颈椎外伤的临床疗效。[方法]从1997年2月~2005年7月共收治129例颈椎外伤性骨折脱位患者。将129例病例随机分成2组,1组70例行头环牵引,其中31例头环牵引加背心带支架保守治疗,39例头环牵引加手术治疗(前路手术18例,后路手术17例,前后路联合手术4例);另1组59例行颅骨牵引,其中13例颅骨牵引加支具保守治疗,46例颅骨牵引加手术治疗(前路手术22例,后路手术20例,前后路联合手术4例)。[结果]随访6~48个月,平均12个月。头环牵引与颅骨牵引对上颈椎骨折脱位的复位作用无明显差异;对下颈椎骨折脱位的复位作用,统计学处理显示头环牵引组要明显好于颅骨牵引组,复位所需时间比颅骨牵引组短,完全复位率高,减压充分,更有利于脊髓功能恢复,治疗后离床时间头环牵引组要短于颅骨牵引组,2组患者治疗前后脊髓功能Frankel分级均有改善。[结论]头环牵引外固定架可改善复位功能,对颈椎的牵引固定作用较颅骨牵引更为坚强稳定,使用安全方便。 相似文献