Is there an impact of cervical plating on the development of adjacent segment degeneration following Smith-Robinson procedure ? A magnetic resonance imaging study of 84 patients with a 24 year follow-up

Publication date: Available online 6 September 2018

Source: The Spine Journal

Author(s): Benedikt W. Burkhardt, Andreas Simgen, Matthias Dehnen, Gudrun Wagenpfeil, Wolfgang Reith, Joachim M. Oertel

Abstract

Background Context

Anterior cervical discectomy and fusion (ACDF) without and with cervical plating (ACDF+CP) are accepted surgical techniques for the treatment of degenerative cervical disc disorders. The effect of CP on the development of adjacent segment degeneration (ASD) remains unclear.

Purpose

To assess whether CP accelerates the degeneration of the adjacent and adjoining segments.

Study design / Setting

This is an imaging cohort study.

Patient sample

Retrospectively, a total of 84 patients who underwent ACDF or ACDF+CP were identified. At final follow-up an MRI was performed and evaluated in this study.

Materials and Methods

An MRI of 84 patients who underwent ACDF (46 patients) and ACDF+PS (38 patients) was performed. The mean follow-up was 24 years (17-45 years). None of the patients had a repeat procedure in the cervical spine. The grade of degeneration of the segments adjacent and adjoining to the fusion was assessed via a five step grading system (segmental degeneration index, or SDI) that includes disc signal intensity, anterior and posterior disc protrusion, narrowing of the disc space, and foraminal stenosis. Furthermore, the disc height (DH) and sagittal segmental angle (SSA) of fused segments were measured.

Results

A significantly (p< .001) greater SDI was identified at the caudal adjacent segment following ACDF compared to ACDF+CP. No other significant differences were identified in patients following ACDF and ACDF+CP. Between 50% and 96% of all segments showed severe degenerative changes according to SDI. There was no significant difference in DH between the patients following ACDF and ACDF+CP. The SSA in patients who underwent ACDF+CP was significantly greater than in the ACDF patients (p= .002).

Conclusions

In this cohort of patients, cervical plating had no significant impact on segmental degeneration and decrease of disc height in the adjacent and adjoining segments. ACDF+CP seems to preserve the lordotic alignment more with respect to the SSA than ACDF.

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