Biomechanical evaluation of artificial cervical disc replacement

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Abstract

OBJECTIVE:

To study the effect of artificial cervical disc replacement on motor range of cervical vertebra and biomechanics of adjacent segment.

METHODS:

Articles about clinical follow-up and controlled studies which were focus on artificial cervical disc replacement were retrieved from CNKI with the keywords of “artificial cervical disc replacement and biomechanics” between 2005 and 2009. And then, those articles were summed up and analyzed.

RESULTS:

Among 21 tests, 469 patients with carotid artery stenosis were included according to the inclusion criteria. The analysis results demonstrated that JOA score of spinal cord function was significantly increased after artificial cervical disc replacement, the replaced segment was stable, and motor range of cervical vertebra was recovered partially. As compared to anterior cervical decompression with bone graft fusion, artificial cervical disc replacement could not increase range of motion and stress loading of adjacent segment, but it could inhibit or decrease degradation of adjacent segment and incidence of range decreasing of cervical vertebra motion. Image indicated that prosthetic displacement, abscission, and subsidence were not found out during follow-up.

CONCLUSION:

Artificial cervical disc replacement can maintain range of cervical vertebra motion and stabilize the cervical vertebra; in addition, it has few effects on adjacent segment and slows down the degradation of adjacent segment; therefore, it is a perspective therapy to treat cervical syndrome. However, it also needs to be further studied due to short-term clinical application, potential heterotopic ossification, prosthetic subsidence, and emersion.

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