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The M6-C Cervical Disk Prosthesis: First Clinical Experience in 33 Patients

Thomas, Sam MD; Willems, Karel MD; Van den Daelen, Luc MD; Linden, Patrick MD; Ciocci, Maria-Cristina PhD; Bocher, Philippe PhD

doi: 10.1097/BSD.0000000000000025

Study Design: Retrospective study.

Objective: To determine the short-term clinical succesrate of the M6-C cervical disk prosthesis in primary and secondary surgery.

Summary of Background Data: Cervical disk arthroplasty (CDA) provides an alternative to anterior cervical decompression and fusion for the treatment of spondylotic radiculopathy or myelopathy. The prevention of adjacent segment disease (ASD), a possible complication of anterior cervical decompression and fusion, is its most cited—although unproven—benefit. Unlike older arthroplasty devices that rely on a ball-and-socket–type design, the M6-C cervical disk prosthesis represents a new generation of unconstrained implants, developed to achieve better restoration of natural segmental biomechanics. This device should therefore optimize clinical performance of CDA and reduce ASD.

Materials and Methods: All patients had preoperative computed tomography or magnetic resonance imaging and postoperative x-rays. Clinical outcome was assessed using the Neck Disability Index, a Visual Analog Scale, and the SF-36 questionnaire. Patients were asked about overall satisfaction and whether they would have the surgery again.

Results: Thirty-three patients were evaluated 17.1 months after surgery, on average. Nine patients had a history of cervical interventions. Results for Neck Disability Index, Visual Analog Scale, and SF-36 were significantly better among patients who had undergone primary surgery. In this group, 87.5% of patients reported a good or excellent result and 91.7% would have the procedure again. In contrast, all 4 device-related complications occurred in the small group of patients who had secondary surgery.

Conclusions: The M6-C prosthesis appears to be a valuable addition to the CDA armatorium. It generates very good results in patients undergoing primary surgery, although its use in secondary surgery should be avoided. Longer follow-up is needed to determine to what measure this device can prevent ASD.

Departments of *Orthopaedic Surgery

Physiotherapy, Stedelijk Ziekenhuis Roeselare, Roeselare

Department of Electronics and Information Technology (ELIT), University College West Flanders, Ugent, Kortrijk, Belgium

The authors declare no conflict of interest.

Reprints: Karel Willems, MD, Department of Orthopaedic Surgery, Stedelijk Ziekenhuis Roeselare, Brugsesteenweg 90, 8800 Roeselare, Belgium (e-mail:

Received March 20, 2013

Accepted September 19, 2013

© 2016 by Lippincott Williams & Wilkins, Inc.