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Flexibility and distraction after monosegmental and bisegmental lumbosacral fixation with angular stable fixators
R H Wittenberg1, M Shea, W C Hayes
1Department of Orthopedic Surgery, Charles A. Dana Research Institute, Harvard-Thorndike Laboratory, Beth Israel Hospital, Boston, Massachusetts, USA.
Spine
|June 1, 1995
Summary
Four intrapedicular fixation devices adequately stabilize the destabilized lumbosacral spine. These devices reduced spinal flexibility and distraction without increasing motion in adjacent segments.
Area of Science:
- Spinal biomechanics
- Orthopedic surgery
- Implantable medical devices
Background:
- The lumbosacral spine is highly mobile, necessitating effective fixation strategies.
- Fixation of the lumbosacral segment and adjacent levels is clinically significant.
Purpose of the Study:
- To compare four intrapedicular fixation devices for lumbosacral stabilization.
- To evaluate device impact on motion segment flexibility and distraction.
Main Methods:
- Destabilization of cadaveric lumbosacral spines (L5-S1 facetectomy or L5 laminectomy).
- Application of four monosegmental and bisegmental intrapedicular devices.
- Assessment of intersegmental motion under compression and flexion/compression loads.
Main Results:
- No significant differences in flexibility or strain among the four implants.
- Stabilized segment strain remained below 10% for all devices.
- All tested fixators reduced flexibility and distraction below intact levels.
- No increase in distraction occurred in the segment above the fusion.
Conclusions:
- Angular stable intrapedicular fixation devices provide adequate stabilization for posteriorly destabilized spines.
- These devices effectively limit motion at the treated segment without adversely affecting adjacent segments.