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Requirements for an artificial intervertebral disc.

M F Eijkelkamp¹, C C van Donkelaar, A G Veldhuizen

¹Department of Biomedical Engineering, University of Groningen, Groningen, The Netherlands. M.F.Eijkelkamp@med.rug.nl

The International Journal of Artificial Organs

|June 26, 2001

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Developing better artificial intervertebral discs (AIDs) is crucial for treating disc degeneration. This study outlines key requirements for AIDs to restore lumbar spine function and improve upon current limitations.

Area of Science:

Biomedical Engineering
Orthopedic Surgery
Spinal Biomechanics

Background:

Intervertebral disc degeneration presents significant socioeconomic challenges.
Current artificial intervertebral discs (AIDs) have limitations, making spinal fusion the primary surgical treatment.
There is a need for improved AIDs to restore lumbar intervertebral disc function.

Purpose of the Study:

To establish a comprehensive list of requirements for developing a functional artificial lumbar intervertebral disc.
To guide the design and development of next-generation AIDs.

Main Methods:

Literature review to gather data on healthy human lumbar intervertebral disc parameters.
Quantification and consistency checks of collected data.
Evaluation of existing AIDs against the defined requirements.

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Main Results:

Identified critical requirements including geometry, stiffness, range of motion, strength, and facet joint function.
Highlighted endplate size as a deficiency in current AIDs, emphasizing the need for larger endplates to prevent migration.
Stiffness and range of motion should mimic healthy discs, with an exception for axial rotation to unload facet joints.

Conclusions:

A detailed set of requirements is essential for advancing AID technology.
Addressing endplate design and biomechanical properties is key to improving AID efficacy.
Optimized AIDs have the potential to offer a superior alternative to spinal fusion for disc degeneration.