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Improving the fixation of an artificial intervertebral disc
M F Eijkelkamp1, J Hayen, A G Veldhuizen
1Department of BioMedical Engineering, University of Groningen, The Netherlands.
The International Journal of Artificial Organs
|May 25, 2002
Summary
This study determined optimal dimensions for artificial intervertebral disc fixation elements. Specific rib sizes and endplate coverage ensure stability and minimize gaps for effective lumbar disc replacement.
Area of Science:
- Biomedical Engineering
- Orthopedic Surgery
- Spinal Biomechanics
Background:
- Artificial intervertebral disc (AID) development requires precise fixation element design.
- Understanding lumbar vertebral endplate dimensions and shape is crucial for AID integration.
Purpose of the Study:
- To determine optimal dimensions for fixation elements of an artificial intervertebral disc.
- To ensure stability and minimize micromotion in lumbar disc replacement.
Main Methods:
- Analysis of lumbar vertebral endplate dimensions and shape from literature and cadaveric specimens.
- Calculation of fixation rib dimensions (sagittal and transversal) for an artificial intervertebral disc.
- Evaluation of endplate coverage and gap formation with a defined convexity.
Main Results:
- Two sagittal ribs (3.5mm height, ≥20mm length) and four transversal ribs (1.5mm height, 60mm total length) are sufficient for stability.
- A range of five sagittal diameters accommodates patient variability.
- Optimal design covers at least 72.6% of the vertebral endplate.
- A 140mm radius convexity limits the gap to 0.62mm.
Conclusions:
- The proposed fixation element dimensions provide adequate stability and coverage for artificial intervertebral discs.
- These findings contribute to the design of more effective and safer lumbar disc prostheses.
- Optimized fixation minimizes risks of dislocation and micromotion, enhancing clinical outcomes.