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Limited experimental data exist comparing the mechanical response of the tibial cortex between fixed and rotating platform (RP) total knee arthroplasty (TKA), particularly in the revision setting. We asked if RP-TKA significantly affects tibiofemoral torque and cortical stain response in both the primary and revision settings. Fixed and RP tibial trays were implanted into analogue tibias and biomechanically tested under axial and torsional loading. Torque and strain response were analyzed using digital image correlation. Fixed bearing designs exhibited 13.8 times greater torque (P<0.01), and 69% (P<0.01) higher cortical strain than RP designs. Strain response was similar in the primary and revision cohorts. The decrease in torque transfer could act as a safeguard to reduce stress, micromotion and torsional fatigue in scenario of poor bone stock.

Original publication

DOI

10.1016/j.arth.2013.08.024

Type

Journal article

Journal

J arthroplasty

Publication Date

03/2014

Volume

29

Pages

541 - 547

Keywords

TKA, digital image correlation, mobile bearing, rotating platform, strain, torque, Arthroplasty, Replacement, Knee, Biomechanical Phenomena, Humans, Knee Joint, Knee Prosthesis, Models, Theoretical, Prosthesis Design, Reoperation, Stress, Mechanical, Tibia, Torque