Park, Spine (Phila Pa 1976) 2004 - Adjacent Segment Disease after Lumbar or Lumbosacral Fusion: Review of the Literature

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Adjacent Segment Disease after Lumbar or Lumbosacral Fusion: Review of the Literature

Park, McGillicuddy, et al.·Spine (Phila Pa 1976)·2004·1,281 citations

Background

The development of pathology at the mobile segment next to a lumbar or lumbosacral spinal fusion has been termed adjacent segment disease. Initially reported to occur rarely, it is now considered a potential late complication of spinal fusion that can necessitate further surgical intervention and adversely affect outcomes.

Purpose

Review the definition, etiology, incidence, and risk factors associated with as well as potential treatment options.

Methods

Study Design: Review of the literature.

MEDLINE literature search.

Results

The most common abnormal finding at the adjacent segment is disc degeneration.
Biomechanical changes consisting of increased intradiscal pressure, increased facet loading, and increased mobility occur after fusion and have been implicated in causing adjacent segment disease.
Progressive spinal degeneration with age is also thought to be a major contributor.
From a radiographic standpoint, reported incidence during average postoperative follow-up observation ranging from 36 to 369 months varies substantially from 5.2 to 100%.
Incidence of symptomatic adjacent segment disease is lower, however, ranging from 5.2 to 18.5% during 44.8 to 164 months of follow-up observation.
The rate of symptomatic adjacent segment disease is higher in patients with transpedicular instrumentation (12.2-18.5%) compared with patients fused with other forms of instrumentation or with no instrumentation (5.2-5.6%).
Potential risk factors include instrumentation, fusion length, sagittal malalignment, facet injury, age, and pre-existing degenerative changes.

Conclusions

Biomechanical alterations likely play a primary role in causing adjacent segment disease. Radiographically apparent, asymptomatic adjacent segment disease is common but does not correlate with functional outcomes. Potentially modifiable risk factors for the development of adjacent segment disease include fusion without instrumentation, protecting the facet joint of the adjacent segment during placement of pedicle screws,fusion length, and sagittal balance. Surgical management, when indicated, consists of decompression of neural elements and extension of fusion. Outcomes after surgery, however, are modest.

Copyright remains with the authors and publisher.

Adjacent Segment Disease after Lumbar or Lumbosacral Fusion: Review of the Literature.

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Adjacent Segment Disease after Lumbar or Lumbosacral Fusion: Review of the Literature

Park, McGillicuddy, et al.·Spine (Phila Pa 1976)·2004·1,281 citations

Background

The development of pathology at the mobile segment next to a lumbar or lumbosacral spinal fusion has been termed adjacent segment disease. Initially reported to occur rarely, it is now considered a potential late complication of spinal fusion that can necessitate further surgical intervention and adversely affect outcomes.

Purpose

Review the definition, etiology, incidence, and risk factors associated with as well as potential treatment options.

Methods

Study Design: Review of the literature.

MEDLINE literature search.

Results

The most common abnormal finding at the adjacent segment is disc degeneration.
Biomechanical changes consisting of increased intradiscal pressure, increased facet loading, and increased mobility occur after fusion and have been implicated in causing adjacent segment disease.
Progressive spinal degeneration with age is also thought to be a major contributor.
From a radiographic standpoint, reported incidence during average postoperative follow-up observation ranging from 36 to 369 months varies substantially from 5.2 to 100%.
Incidence of symptomatic adjacent segment disease is lower, however, ranging from 5.2 to 18.5% during 44.8 to 164 months of follow-up observation.
The rate of symptomatic adjacent segment disease is higher in patients with transpedicular instrumentation (12.2-18.5%) compared with patients fused with other forms of instrumentation or with no instrumentation (5.2-5.6%).
Potential risk factors include instrumentation, fusion length, sagittal malalignment, facet injury, age, and pre-existing degenerative changes.

Conclusions

Biomechanical alterations likely play a primary role in causing adjacent segment disease. Radiographically apparent, asymptomatic adjacent segment disease is common but does not correlate with functional outcomes. Potentially modifiable risk factors for the development of adjacent segment disease include fusion without instrumentation, protecting the facet joint of the adjacent segment during placement of pedicle screws,fusion length, and sagittal balance. Surgical management, when indicated, consists of decompression of neural elements and extension of fusion. Outcomes after surgery, however, are modest.

Copyright remains with the authors and publisher.

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