gms | German Medical Science

54. Jahrestagung der Norddeutschen Orthopädenvereinigung e. V.

Norddeutsche Orthopädenvereinigung

16.06. bis 18.06.2005, Hamburg

Curvature and range of motion before and after total cervical disc replacement

Meeting Abstract

  • corresponding author C. Mehren - Orthozentrum München, Wirbelsäulenzentrum, München
  • F. Grochulla - München
  • A. Korge - München
  • H. Mayer - München

Norddeutsche Orthopädenvereinigung. 54. Jahrestagung der Norddeutschen Orthopädenvereinigung e.V.. Hamburg, 16.-18.06.2005. Düsseldorf, Köln: German Medical Science; 2005. Doc05novW1.09

The electronic version of this article is the complete one and can be found online at:

Published: June 13, 2005

© 2005 Mehren et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.




The adjacent level instability after fusion is a well-known problem of the cervical spine. Due to the implantation of a total disc prosthesis the concerned segment should be kept mobile to decrease the load for the adjacent levels. Aim of the study is primarily to prove the function of the implanted prosthesis.


ProDisc C was implanted in 25 patients in a standard microsurgical technique. The indications were symptomatic cervical disc disease. Based on the lateral view of plain X- ray, we measured lordosis and segmental range of motion pre- and postoperatively. The average time of the postoperative investigation period was six months.


In reference to the monosegmental disc replacement, we proved an increase of the average lordosis from 6mm (0-15mm) preoperatively, to 9 mm (9-13mm) postoperatively. The global range of motion was pre- as well as postoperatively 32° in average. The segmental range of motion increased postoperatively from 7.5° (1-11°) preoperatively to 12° (7-19°). In reference to the multisegmental disc replacement the average of the lordosis increased postoperatively from 5 mm to 8.5 mm. The global (30°) as well as the segmental (8°) range of motion stayed consistent.


In most cases we could prove a satisfactory mobility of the treated segment, therefore movement pattern of the cervical spine is kept by disc replacement. Most of all in reference to the monosegmental disc replacement, the clinical and the radiological results are satisfying. Further longterm evaluations will show incidence of adjacent level instabilities and implant behaviour.