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Traumatic loading of the Bryan cervical disc prosthesis: an in vitro study
Neil Duggal1, Doron Rabin, Robert H Chamberlain
1Division of Neurosurgery, University of Western Ontario, London, Canada.
Neurosurgery
|April 7, 2007
Summary
The Bryan disc prosthesis offers significant stability after cervical arthroplasty, with remaining ligaments ensuring adequate acute spinal stability. This study evaluated the safety and strength of cervical arthroplasty in trauma settings.
Area of Science:
- Orthopedic Surgery
- Biomechanical Engineering
- Spinal Biomechanics
Background:
- Cervical arthroplasty using the Bryan disc aims for immediate stability via precise endplate fit.
- The safety of this procedure in trauma cases remains unestablished.
Purpose of the Study:
- To compare the segmental strength of intact cadaveric cervical spines with those undergoing single-level arthroplasty.
Main Methods:
- Fifteen cadaveric cervical spines with C5-C6 arthroplasty were tested against 16 intact controls.
- Pure moments were applied to induce flexion, extension, and axial rotation to failure.
Main Results:
- The Bryan disc prosthesis retained 63% (flexion), 45% (extension), and 69% (rotation) of normal spinal strength.
- No instances of prosthesis expulsion were observed.
Conclusions:
- The Bryan disc prosthesis provides substantial stability following cervical arthroplasty.
- Remaining ligamentous structures adequately stabilize the spine acutely after Bryan disc implantation.
