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Knee Surgery, Sports Traumatology, Arthroscopy
Published in: Knee Surgery, Sports Traumatology, Arthroscopy 2/2008

01-02-2008 | Knee

The Self-Aligning knee prosthesis: clinical and radiological outcome and survival analysis at 5-year follow up

Authors: M. J. F. Diks, P. G. Anderson, J. C. A. D. Janssen, G. van Stralen, A. B. Wymenga

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 2/2008

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Abstract

The purpose of this study is to evaluate the clinical and radiological results and the survival of the SAL II mobile bearing knee prosthesis at 5-year follow up. Between February 1995 and March 1998 a total of 246 SAL II total knee arthroplasties were performed in 232 patients. The mean follow up was 5.0 years. Thirteen revisions had been carried out (5%). The mean total Knee Society Score increased from 88 preoperatively to 153 and 155 at 1 and 5 years follow up, respectively. The mean flexion angles were 106° and 107° pre- and postoperatively. None of the prostheses showed radiological loosening. No dislocations or subluxations of inserts were seen. The Kaplan–Meier cumulative survival is 95% for revision for any reason at 5.0 years, with a worst case scenario of 91%. The survival for aseptic loosening is 99%. The results of SAL II after a minimum follow up of 5 years are favourable and comparable with fixed bearing and other mobile bearing designs in terms of Knee Society Score and survival. Noteworthy are the good radiological results of this device which showed a good fixation of the prosthesis at 5 years.
Footnotes
1
The scoring system for radiolucency is determined for each of the three components by measuring in millimetres the width of the radiolucent lines for each zone. The sum of the widths per zone are determined for each prosthesis. The numerical score can be rated as follows: nonsignificant (a total of 4 or less without progression), threat of loosening requiring periodic control (5–9), and possible or impending failure (a total of 10 or more, regardless of symptoms).
 
2
If the prosthesis was replaced, the total observation time was defined as the interval between operation date and revision date. If the original prosthesis was in situ when the patient died, the observed time was calculated as the interval between the operation date and the date of death. If the patient could not be contacted, the total observation time was calculated as the interval between the operation date and the last appointment in the hospital plus half of the interval between the date of the last hospital visit and the date that contact was sought with the patient.
 
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Metadata
Title
The Self-Aligning knee prosthesis: clinical and radiological outcome and survival analysis at 5-year follow up
Authors
M. J. F. Diks
P. G. Anderson
J. C. A. D. Janssen
G. van Stralen
A. B. Wymenga
Publication date
01-02-2008
Publisher
Springer-Verlag
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 2/2008
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-007-0434-5

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