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Journal of Long-Term Effects of Medical Implants
SJR: 0.133 SNIP: 0.491 CiteScore™: 0.89

ISSN Print: 1050-6934
ISSN Online: 1940-4379

Journal of Long-Term Effects of Medical Implants

DOI: 10.1615/JLongTermEffMedImplants.v21.i3.30
pages 197-203

Fixed Versos Mobile Bearing Knee Arthroplasty: A Review of Kinematics and Results

A. P. Apostolopoulos
Fourth Orthopaedic Department. Askleipion Hospital, Athens, Greece
loannis V. Michos
Fourth Orthopaedic Department, Askleipion Hospital, Athens, Greece
Andreas F. Mavrogenis
First Department of Orthopaedics, National and Kapodistrian University of Athens, School of Medicine, ATTIKON University Hospital, Athens, Greece
E. Chronopoulos
Secortd Orthopaedic Department, Athens University Medical School, Agia Olga Hospital
G. Papachristou
Secortd Orthopaedic Department, Athens University Medical School, Agia Olga Hospital
Stergios N. Lallos
Second Department of Orthopaedics, University of Athens Medical School, Athens, Greece
Nikolaos E. Efstathopoulos
Second Department of Orthopaedics, Athens University Medical School, Athens, Greece


There are several total knee arthroplasty designs available with wide variation in features. The long-term results of total knee replacement with a fixed bearing design have shown a high degree of clinical success. However, implant loosening and polyethylene wear became recognized as long-term causes of late failure. Mobile bearing knee replacements were designed to create a durable surface articulation by using a polyethylene insert that articulates with a metallic femoral component and a metallic tibial tray. The purpose of this article is to review clinical and basic scientific studies comparing the clinical results, the biomechanical features, and the kinematic patterns of fixed versus mobile bearing knee designs. Beside the fact that in vitro kinematic studies have shown reduced polyethylene wear in mobile bearings due to increased implant conformity and reduced polyethylene contact stresses, which should hypothetically prolong polyethylene life, various independent studies for both mobile bearing and fixed bearing prostheses have documented results that are comparable in terms of survival and performance.