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. 2012 Dec 1;1(12):315-23.
doi: 10.1302/2046-3758.112.2000064. Print 2012 Dec.

Does a new knee design perform as well as the design it replaces?

M Molt  1 , P Ljung, S Toksvig-Larsen
Affiliations

Does a new knee design perform as well as the design it replaces?

M Molt et al. Bone Joint Res. .

Abstract

Objectives: The objective of this study was to compare the early migration characteristics and functional outcome of the Triathlon cemented knee prosthesis with its predecessor, the Duracon cemented knee prosthesis (both Stryker).

Methods: A total 60 patients were prospectively randomised and tibial component migration was measured by radiostereometric analysis (RSA) at three months, one year and two years; clinical outcome was measured by the American Knee Society score and the Knee Osteoarthritis and Injury Outcome Score.

Results: There were no statistically significant differences in rotation or translation around or along the three coordinal axes, or in the maximum total point motion (MTPM) during the two-year follow-up.

Conclusions: The Triathlon cemented knee prosthesis has similar early stability and is likely to perform at least as well as the Duracon cemented knee prosthesis over the longer term.

Keywords: New design; RSA; Safety; Single radius; TKR; Total knee replacement.

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Conflict of interest statement

ICMJE Conflict of Interest:The authors have no other conflicts of interest. The study sponsor had no involvement in the analysis and interpretation of the results

Figures

Fig. 1
Fig. 1
CONSORT recruitment and follow-up chart.
Fig. 2
Fig. 2
Graph showing the mean maximum total point motion (MTPM) for both the Triathlon and Duracon groups over the two-year follow-up. Error bars denote the 95% confidence interval.
Figs. 3a - 3b
Figs. 3a - 3b
Graphs showing the individual subsidence for each knee in a) the Duracon and b) the Triathlon group. Each line represents the migration pattern for an individual patient.
Figs. 3a - 3b
Figs. 3a - 3b
Graphs showing the individual subsidence for each knee in a) the Duracon and b) the Triathlon group. Each line represents the migration pattern for an individual patient.
Figs. 4a - 4b
Figs. 4a - 4b
Graphs showing the individual maximum total point motion (MTPM) for each knee in a) the Duracon and b) the Triathlon group. Each line represents the migration pattern for an individual patient.
Figs. 4a - 4b
Figs. 4a - 4b
Graphs showing the individual maximum total point motion (MTPM) for each knee in a) the Duracon and b) the Triathlon group. Each line represents the migration pattern for an individual patient.
Fig. 5
Fig. 5
Bar chart showing the American Knee Society scores (AKSS; both knee score and function score) for both the Duracon and Triathlon groups. Error bars denote the 95% confidence interval.
See this image and copyright information in PMC

Comment in

References

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