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Motion preservation technologies: alternatives to spinal fusion
1Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA. kernsingh@gmail.com
American Journal of Orthopedics (Belle Mead, N.J.)
|October 14, 2006
Summary
Spinal fusion can cause adjacent-level degeneration. Nonfusion spinal implants, like disc replacements, aim to preserve motion and reduce these risks, but require careful patient selection and further study.
Area of Science:
- Orthopedics
- Spinal Surgery
- Biomedical Engineering
Background:
- Spinal arthrodesis effectively manages spinal instabilities, deformities, and pain.
- Fusion-related morbidities include graft-site harvest, pseudarthrosis, and adjacent-level degeneration.
- Altered stress transfer from fused segments contributes to adjacent-level degeneration.
Purpose of the Study:
- To review nonfusion spinal technologies as alternatives to fusion.
- To discuss the theoretical advantages of motion-sparing implants.
- To highlight the need for careful patient selection and outcome studies for nonfusion devices.
Main Methods:
- Review of biomechanical and clinical evidence.
- Categorization of nonfusion technologies into three major types.
- Discussion of theoretical benefits and limitations.
Main Results:
- Nonfusion implants offer theoretical advantages over spinal fusion.
- Concerns about fusion-related complications drive the development of alternatives.
- Three main categories of nonfusion technologies are identified.
Conclusions:
- Motion-sparing implants present potential benefits but require further outcome studies.
- Judicious use and careful patient selection are crucial for nonfusion technologies.
- Total disc replacement, prosthetic nuclear implants, and posterior stabilization devices are key nonfusion approaches.
