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Knee Surgery, Sports Traumatology, Arthroscopy

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Open Access 01-08-2012 | Knee

Functional performance of mobile versus fixed bearing total knee prostheses: a randomised controlled trial

Authors: W. C. H. Jacobs, B. Christen, A. B. Wymenga, A. Schuster, D. B. van der Schaaf, A. ten Ham, U. Wehrli

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 8/2012

Abstract

Purpose

The primary goal of this study was to assess the difference in active flexion between patients with a mobile versus a fixed bearing, cruciate retaining, and total knee arthroplasty. The study was designed as a randomised controlled multi-centre trial.

Methods

Participants were assigned to interventions by using block-stratified, random allocation. Outcome parameters were active flexion, passive flexion, and Knee Society Score (KSS). Outcome parameters were assessed preoperatively and at 3, 6, and 12 months postoperatively by an independent nurse.

Results

Ninety-two patients from one centre were included, 46 in each group. Active flexion was comparable for the two groups, 99.9° for the mobile bearing group and 101° for the fixed bearing group with a baseline controlled difference of 1.0 (95% CI −3.9 to 5.8, n.s.). The Clinical KSS was comparable between the two bearing groups (Mobile 90.0 vs. fixed 92.4, n.s.). The functional KSS showed a difference that was attributable to the stair climbing subscore, which showed a difference in favour of the fixed bearing design between preoperative and 3 months (7.3 point difference; 95% CI 2.3–12.5; P = 0.005) as well as 12 months (4.8 point difference; 95% CI 0.1–9.6; P = 0.045).

Conclusions

There were no short-term differences in active flexion between fixed bearing and mobile bearing total knee arthroplasty.

Level of evidence

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Title: Functional performance of mobile versus fixed bearing total knee prostheses: a randomised controlled trial
Authors: W. C. H. Jacobs
B. Christen
A. B. Wymenga
A. Schuster
D. B. van der Schaaf
A. ten Ham
U. Wehrli
Publication date: 01-08-2012
Publisher: Springer-Verlag
Published in: Knee Surgery, Sports Traumatology, Arthroscopy / Issue 8/2012
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI: https://doi.org/10.1007/s00167-011-1684-9

At a glance: The STEP trials

Springer Medicine

Functional performance of mobile versus fixed bearing total knee prostheses: a randomised controlled trial

Abstract

Purpose

Methods

Results

Conclusions

Level of evidence

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

Level of evidence

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