340 - Early Outcomes with the Deformity Correcting Synergy Disc Replacement...

#340 Early Outcomes with the Deformity Correcting Synergy Disc Replacement

Cervical Therapies and Outcomes

Poster Presented by: K.Z. Yuksei


K. Yucesoy (1)
K.Z. Yuksel (2)
M. Yuksel (3)
O. Kalemci (1)

(1) Dokuz Eylul University, Neurosurgery, Izmir, Turkey
(2) Kahramanmaras Sutcu Imam University, Neurosurgery, Kahramanmaras, Turkey
(3) Kahramanmaras Sutcu Imam University, Radiology, Kahramanmaras, Turkey


Aims: Current artificial cervical discs have been implicated in the development of post-operative kyphosis. As such, the indication for cervical arthroplasty in the literature has progressively narrowed, excluding patients without a normal pre-operative cervical lordosis. The Synergy Disc is a new technology that introduces deformity correction while maintaining full range of motion in a cervical disc replacement. It is differentiated by its unique ability to correct pre-operative deformity and prevention of post-operative kyphosis. This study evaluated whether the Synergy Disc replacement could provide preservation and/or restoration of sagittal alignment while providing kinematics and acceptable clinical outcomes.

Methods: A single-center, prospective, consecutive patient enrollment study using the Synergy Disc (Synergy Disc Replacement Inc., Chandler, AZ, USA) for the treatment of single and two-level degenerative disc disease of the cervical spine was performed.

Clinical outcomes were measured using Neck Disability Index and Visual Analog Scale. Static and dynamic radiological assessments were performed in 37 consecutive patients prior to the placement of the Synergy Disc. 34 patients with a minimum of 12 months post surgery follow-up were included for evaluation. Range of motion (ROM), translation, center of rotation (COR), disc height (DH) and shell angle (SA) were calculated prior to surgery and at each time point following surgery.

Results: At a minimum of one-year follow-up (range 12-17 months, mean 14 months) there was lasting relief of radiculopathy and/or myelopathy in all cases, with no complications related to the surgical approach, instrumentation or the device. There was significant improvement in all clinical outcome measures following surgery. Medical Metrics analyzed 204 radiographs (n=34 patients). Following surgery, the average SA of the Synergy disc was 6 ± 3° of lordosis. ROM, translation and COR X did not change significantly. There was a significant superior shift in the COR Y.

Conclusions: The Synergy Disc provides predictable and durable lordosis correction and potentially provides motion preservation for patients with pre-operative straightening or kyphosis of the cervical spine.