颈腰椎术后邻近节段退变

disc of the adjacent mobile segment.
•Increased intradiscal pressure develops in the disc immediately neighboring a fused segment.
Etiology
•In vivo animal investigations have suggested that
proportions and 95% confidence interval (CI) for each
study and then pooled the data to derive a pooled
proportion and 95% CI.
Literature Review
• Definition • Etiology
• ASD includes the radiograph ASD and the symptoms ASD. • The radiograph ASD was defined as radio graphical changes seen at levels adjacent to a previous spinal fusion procedure that do not necessarily correlate with any clinical findings • whereas symptoms ASD referred to the development of new clinical symptoms that correspond to radio graphical changes adjacent to the level of a previous spinal fusion.
EtioloFra Baidu biblioteky
•Although the exact mechanism remains uncertain, altered
biomechanical stresses appear to play a key role in the
development of ASD. •Each fusion technique specifically shifted the center of rotation leading to increased stress on the facets and/or
• Methods:
MEDLINE literature search
Materials and Methods
• In the frist article,A MEDLINE search was performed using the key words “adjacent” with “spinal fusion” for the years 1966 to 2002, which generated 271 articles. • Each title and abstract was reviewed as well as the complete article, when relevant. A total of 38 articles fulfilled these criteria[标准] ,including the translation of two non-English articles believed to be particularly
altered biomechanics primarily cause ASD. •clinical studies are contradictory. Based on radiographic
analysis, several investigators have argued that ASD is nothing more than the normal degenerative process rather than a consequence of biomechanical stresses.
Adjacent Segment Disease after Spine Surgery Fusion: Review of the Literature
Qian jin Yu
• Study Design: Review of the literature.
• Objectives: Review the definition, etiology, incidence, and risk factors associated with as well as potential treatment options.
pertinent.
Materials and Methods
• The second article Searched the MEDLINE until March 2012 published in English language that reported the prevalence of ASD after spine surgery. •The author determined the ASD rates by calculating
Incidence
The prevalence of ASD increased with the extension of follow up time.
• Incidence
• Risk Factors • Treatment
Definition
• Adjacent segment disease is a term with broad meaning, since it can describe nearly any abnormal process that develops in the mobile segment next to a spinal fusion simpley.