摘要:

Isolated human thoracic vertebral bodies were systematically subjected to compressive loads at three different strain rates over four orders of magnitude. Each vertebra was crushed to 50% of its original length. High-speed motion picture films were taken of each test event. Static, quasistatic, and dynamic material property data were collected and included ultimate load, deformation to ultimate load, stiffness, and energy to ultimate load. Analysis and interpretation of high-speed motion films indicated that whenever the vertebral body is loaded in compression it deforms, and the deformation applies pressure on the marrow contents. This internal hydraulic effect may be a contributory factor to the observed nonlinear increase in strength as strain rate increases. The response of the marrow with respect to the deformation of the vertebral centrum is described. When the compressive load was removed, all vertebrae began a recovery process. The general features of this restoration process are described. The mechanism or mechanisms by which recovery takes place are not fully understood.

ISSN:0362-2436    

出版商:OVID    

年代:1977

数据来源: OVID

摘要:

Methyl methacrylate was used for the stabilization or replacement of portions of the cervical spine in 24 patients who had instability or neurologic deficit secondary to unresectable primary or metastatic tumors. Vertebral body replacement was performed after anterior decompression in 10 patients. Posterior stabilization, with or without a decompressive laminectomy, was carried out in 14 patients. Seventeen of the 24 patients were symptomatically improved; none was made worse neurologically, and all but 4 were able to be mobilized by the third postoperative day. During the first month after surgery, 5 patients died from widespread metastatic disease. Although initial stabilization was achieved in all cases, there were four instances of late instability. There were no infections and no unusual tissue reactions to the methyl methacrylate.

ISSN:0362-2436    

出版商:OVID    

年代:1977

数据来源: OVID

摘要:

The use of early anterior spondylodesis to achieve earlier mobilization of patients with traumatic lesions of the cervical spine has been recommended by some authors, while others think that this procedure has a limited place in the management of patients with acute trauma. This article critically analyzes the complications observed in 41 patients who underwent anterior cervical spondylodesis for traumatic lesions. The total comprehensive rehabilitation time for patients with tetraplegia who underwent this operation was not different from the group who did not have the operation.

ISSN:0362-2436    

出版商:OVID    

年代:1977

数据来源: OVID

摘要:

A study was done to evaluate the frequency and importance of disc protrusion in cervical trauma that resulted in major neurologic deficit, and this paper is a preliminary report of the results. Twenty consecutive patients underwent contrast studies shortly after injury, and 8 were judged to have significant disc herniations impinging on the spinal cord. All underwent early surgery with excision of the lesion. Four patients exhibited marked improvement in the immediate postoperative period. On the basis of these findings, early definitive diagnostic studies are considered indicated in patients with major neurologic deficit following cervical trauma, since the incidence of spinal cord compression from a damaged disc appears significant. Surgical excision of the disc resulted in rapid neurologic improvement in half of the cases.

ISSN:0362-2436    

出版商:OVID    

年代:1977

数据来源: OVID

摘要:

This report reviews data obtained from electromyographic studies of the musculature of the trunk and considers their physiologic and methodologic bases. Current knowledge regarding the relation between electrical and mechanical output of muscle is incomplete and conflicting, but supports interpreting electromyographic information based on a principle of monotonicity, in which changes in electrical output parallel changes in force. Electromyographic information is utilized to define the role of individual trunk muscle groups in the functional anatomy of the lumbar spine in various positions, motions, and conditions.

ISSN:0362-2436    

出版商:OVID    

年代:1977

数据来源: OVID

摘要:

A one-stage decompression-stabilization procedure has been developed for the treatment of thoracolumbar fracture-dislocation with neurologic deficit. A modified costotransversectomy decompression followed by Harrington rod stabilization was employed. This approach not only gives more satisfactory decompression, but also allows early mobilization and rehabilitation.

ISSN:0362-2436    

出版商:OVID    

年代:1977

数据来源: OVID

摘要:

A new device has been developed to allow direct calibrated measurements of the distraction force applied to the vertebral laminae during Harrington instrumentation. The device utilizes the original outrigger apparatus and includes a spring with calibration sleeve to allow direct readings. The device is offered as a simple, convenient teaching aid to prevent laminar fracture during Harrington rod placement.

ISSN:0362-2436    

出版商:OVID    

年代:1977

数据来源: OVID

摘要:

Adult diastematomyelia is a rarely reported condition. Only 3 such cases in living adults over 35 years of age have been recorded in the English literature. Another adult case of diastematomyelia is reported, and clinical, neuroradiologic, and surgical aspects of this condition are discussed.

ISSN:0362-2436    

出版商:OVID    

年代:1977

数据来源: OVID

摘要:

Of the more than 1000 patients seen at the Mayo Clinic with surgically proven bone tumor involving the vertebral column, thoracic cage, pelvis, or lower extremities, 38 had the preoperative diagnosis of protruded lumbar intervertebral disc. Of these 38 patients, 18 underwent myelography and laminectomy for disc protrusion, without relief of symptoms. Six others underwent laminectomy, at which time an osseous lesion was discovered. The remaining 14 patients had a negative myelogram, and the bone tumor became evident on roentgenogram after unsuccessful conservative treatment. Our data suggest that a clinical similarity exists between bone tumors and protruded lumbar intervertebral discs; intractable, progressive pain accentuated by the supine position favors the diagnosis of bone tumor. Bone tumors must be considered in the differential diagnosis of low-back pain and sciatica.

ISSN:0362-2436    

出版商:OVID    

年代:1977

数据来源: OVID

摘要:

Intermittent cauda equina compression remains a diagnostic challenge. The authors have reviewed 30 operative cases and the literature, and conclude that the diagnosis can be made on clinical grounds only. A myelographic deformity, no matter how marked, is not diagnostic proof of this syndrome, nor is the absence of neurologic deficit. Decompression by laminectomy and medial face-tectomy brings about a gratifying result in most instances.

ISSN:0362-2436    

出版商:OVID    

年代:1977

数据来源: OVID