88 - Clinical Results of Un-constrained and Semi-constrained Cervical Artif...

#88 Clinical Results of Un-constrained and Semi-constrained Cervical Artificial Disc in C3-C7

Cervical Therapies and Outcomes

Poster Presented by: C. Kao


C.-H. Kao (1)

(1) CHI-MEI Medical Center, Department of Surgery, Yung Kang City, Taiwan, Republic of China


Background: There had limited published reports on the range of motion of cervical artificial disc replacement . We compared the clinic results between semi-constrained (Prestige disc, Prodisc-C) and un-constrained (Bryan disc) prostheses.

Methods: A retrospective analysis was performed in 151 patients (209 levels) who received cervical artificial disc replacement between January 2008 and August 2011. And follow-up radiological image at least 1 yr. 66 cases (91 levels) were replaced with un-constrained prosthesis of Bryan disc, 85cases (118 levels) were with semi-constrained prosthesis of Prestige and Prodisc-C. Comparisons of clinical and operative details and the ROM of different levels of cervical vertebrate.

Results: The operation time of semi-constrained prosthesis (Prestige disc : Bryan disc =3.4h : 4.1h) was significant long time than un-constrained prosthesis (p< 0.01) due to its installation was more complicated. The bleeding, length of stay, VAS and ODI score outcome were no significant difference between two groups. The ROM of cervical vertebrate was significant difference between two groups, especially in the lower segment. (C5-6: Prestige disc: Bryan disc = 9.7: 12.8 ; C6-7: Prestige disc: Bryan disc = 6.7:12.6).

Conclusion: Both semi- and un-constrained prosthesis used in cervical disc replacement can provide improvement in the ability to perform activities of daily living, decrease pain and maintenance of good motion. Installation of semi-constrained prosthesis prostheses is simpler. Long-term radiological image follow-up shows the ROM trended to larger angle at un-constrained prosthesis of Bryan, especially in the lower segment cervical spine. The facet and uncovertebral joints degeneration will be needed to long-term follow-up.