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Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy 7/2014

01.07.2014 | Knee

In vivo kinematics comparison of fixed- and mobile-bearing total knee arthroplasty during deep knee bending motion

verfasst von: Xiaojun Shi, Bin Shen, Jing Yang, Pengde Kang, Zongke Zhou, Fuxing Pei

Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy | Ausgabe 7/2014

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Abstract

Purpose

The in vivo kinematics of fixed-bearing and mobile-bearing total knee prostheses remains unclear, particularly for knee flexion over 120°. The purpose of this study was to compare the in vivo kinematics of fixed-bearing and mobile-bearing posterior-stabilized prosthesis during deep knee bending with knee flexion exceeding 120° under weight-bearing conditions.

Methods

In vivo kinematics was analysed for 20 patients implanted with either a fixed-bearing posterior-stabilized or mobile-bearing posterior-stabilized prosthesis. Under fluoroscopic surveillance, each patient performed weight-bearing deep knee bending. Motion between each component was analysed using a two- to three-dimensional registration technique, which uses computer-assisted design models to reproduce the spatial positions of the femoral and tibial components from single-view fluoroscopic images.

Results

Patients who had fixed-bearing prostheses experienced posterior femoral rollback at a mean of 1.4 mm (SD 1.6) of the medial condyle, whereas patients who had mobile-bearing prostheses experienced 0.8 mm (SD 1.2). The posterior femoral rollback of the femoral lateral condyle in patients with a fixed-bearing prosthesis was a mean of 6.4 mm (SD 1.7) motion in the posterior direction, whereas patients who had a mobile-bearing prosthesis had 6.5 mm (SD 2.4) motion. The mean tibial internal rotation was 7.5° (SD 2.1) for fixed-bearing prosthesis and 9.2° (SD 3.2) for mobile-bearing prosthesis.

Conclusions

The present results demonstrated that the fixed-bearing and mobile-bearing posterior-stabilized designs had similar posterior condylar translation and tibial axial rotation during weight-bearing deep knee flexion exceeding 120°.

Level of evidence

Retrospective comparative study, Level III.
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Metadaten
Titel
In vivo kinematics comparison of fixed- and mobile-bearing total knee arthroplasty during deep knee bending motion
verfasst von
Xiaojun Shi
Bin Shen
Jing Yang
Pengde Kang
Zongke Zhou
Fuxing Pei
Publikationsdatum
01.07.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
Knee Surgery, Sports Traumatology, Arthroscopy / Ausgabe 7/2014
Print ISSN: 0942-2056
Elektronische ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-012-2333-7

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