An experimental model of adult-onset slip progression in isthmic spondylolistesis.
نویسندگان
چکیده
Progressive spondylolisthesis may occur in adults with isthmic spondylolysis with an estimated incidence of 20%. This biomechanical study showed that in adult spines with bilateral L5 pars fractures, an anterior slip of L5 depends on the extent of the load-bearing deficiency of the disc and the presence of shear force across L5-S1. A combination of disc degeneration and muscle dysfunction may be responsible for converting a stable isthmic spondylolysis into an unstable progressive spondylolisthesis.
منابع مشابه
High-Grade Adult Isthmic L5–S1 Spondylolisthesis: A Report of Intraoperative Slip Progression Treated with Surgical Reduction and Posterior Instrumented Fusion
Adult isthmic spondylolisthesis most commonly occurs at the L5-S1 level of the lumbar spine. Slip progression is relatively rare in adults with this condition and slippage is typically associated with advanced degeneration of the disk below the pars defect. When symptomatic, radiculopathy is the typical complaint in adults with isthmic spondylolisthesis. When considering options for surgical tr...
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STUDY DESIGN A retrospective radiological evaluation. PURPOSE To verify that PI is related with progression of IS as well as development of IS and to assess the differences of pelvic parameters between the L4 & L5 IS, as well as between single & two level IS. OVERVIEW OF LITERATURE High pelvic incidence (PI) has been known to be related with development of IS. However, the previous studies ...
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STUDY DESIGN A clinical retrospective study was conducted. OBJECTIVE To evaluate the clinical and radiographic outcomes of 25 consecutive patients with symptomatic high-grade isthmic spondylolisthesis at L5-S1 treated by decompression and transvertebral, transsacral strut grafting with fibular allograft. SUMMARY OF BACKGROUND DATA Symptomatic high-grade isthmic spondylolisthesis serves as a...
متن کاملProgression of spondylolysis to isthmic spondylolisthesis in an adult without accompanying disc degeneration: a case report.
Progression of spondylolysis to spondylolisthesis in adults is very rare. It is always accompanied by disc degeneration at the slip level, or at a lower level. The intervertebral disc is indeed the main structure that opposes the anteriorly directed shear forces. Of course, the disc degeneration might also be a consequence, rather than a cause of the slip. The authors describe an unusual case o...
متن کاملBiomechanical evaluation of predictive parameters of progression in adolescent isthmic spondylolisthesis: a computer modeling and simulation study
BACKGROUND Pelvic incidence, sacral slope and slip percentage have been shown to be important predicting factors for assessing the risk of progression of low- and high-grade spondylolisthesis. Biomechanical factors, which affect the stress distribution and the mechanisms involved in the vertebral slippage, may also influence the risk of progression, but they are still not well known. The object...
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ورودعنوان ژورنال:
- Studies in health technology and informatics
دوره 91 شماره
صفحات -
تاریخ انتشار 2002