نتایج جستجو برای: segmental instability
تعداد نتایج: 109551 فیلتر نتایج به سال:
the joints between segmental rings can withstand a certain amount of bending moment as well as axial and shear forces. generally, in the structural analysis of tunnel segmental lining, the joints can be modeled as elastic hinges or rotational springs, and their rigidity should be demonstrated in terms of the rigidity of the joints or their rotational stiffness. therefore, the bending moment act...
STUDY DESIGN Retrospective cross-sectional study. PURPOSE To investigate the relationship between ligamentum flavum (LF) hypertrophy and lumbar segmental motion. OVERVIEW OF LITERATURE The pathogenesis of LF thickening is unclear and whether the thickening results from tissue hypertrophy or buckling remains controversial. METHODS 296 consecutive patients underwent assessment of the lumbar...
Segmental duplications, which comprise approximately 5%-10% of the human genome, are known to mediate medically relevant deletions, duplications, and inversions through nonallelic homologous recombination (NAHR) and have been suggested to be hot spots in chromosome evolution and human genomic instability. We report seven individuals with microdeletions at 17q23.1q23.2, identified by microarray-...
OBJECTIVE To observe the therapeutic effects of segmental resection and decompression combined with joint prosthesis on continuous knee osteoarthritis (OA). METHODS A total of 130 patients with knee OA were selected and randomly divided into an observation group and a control group (n=65). The control group was treated by segmental resection in combination with joint prosthesis, and the obser...
Over the last decades segmental spinal fusion has become the standard surgical procedure for lumbar degenerative spondyloarthropathy [1]. Its evolution towards the most modern instrumentation techniques has achieved a very high percentage of success in spinal fusion in the lumbar region [2]. This varies between 72 and 91%, depending on the technique used. But the success of lumbar fusion has be...
Gene duplications alter the genetic constitution of organisms and can be a driving force of molecular evolution in humans and the great apes. In this context, the study of genomic disorders has uncovered the essential role played by the genomic architecture, especially low copy repeats (LCRs) or segmental duplications (SDs). In fact, regardless of the mechanism, LCRs can mediate or stimulate re...
Segmental bone defects of the tibia present a challenging problem, particularly when they are associated with soft tissue injuries or instability. Various techniques have been reported to treat bone loss in the tibia. This case report describes a patient with massive segmental bone loss associated with a soft tissue injury, which required a flap for coverage. The injury was treated with an ipsi...
abnormalities and degeneration in the intervertebral disc. The associated pathological entities include herniation of the nucleus pulposus, DDD, and segmental instability. In recent years, the diagnostic accuracy and description of these abnormalities have been aided by the development of water-soluble myelography, MR imaging, provocative discography, diagnostic blocks, and high-resolution CT s...
Subterminal regions, juxtaposed to telomeres on human chromosomes, contain a high density of segmental duplications, but relatively little is known about the evolutionary processes that underlie sequence turnover in these regions. We have characterized a segmental duplication adjacent to the Xp/Yp telomere, each copy containing a hypervariable array of the DXYS14 minisatellite. Both DXYS14 repe...
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