A mobile-bearing knee replacement or arthroplasty is a knee implant where the plastic component (that replaces the meniscus) is mobile.
Mobile-bearing knee replacement
The polyethylene tibial insert is designed to facilitate movement of the insert relative to the tibial tray upon which is sits.
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FORUM DISCUSSIONS
CLINICAL PUBLICATIONS
Mobile bearing and fixed bearing total knee arthroplasty. Capella M, Dolfin M and Saccia F. Ann Transl Med. 2016 Apr; 4(7): 127.