Mechanical performance of cementless total knee replacements: It is not all about the maximum loads

• DOI: 10.1002/jor.24194
• Publication Date: 2018-11-30T11:44:25Z
• Authors: Fernando J. Queve...; Joseph D. Lipman; Darrick Lo; Ivan De Martino; Peter K. Sculco; Thomas P. Sculco; Fabio Catani; Timothy M. Wright
• Keywords: Biomechanics

ABSTRACT Finite element (FE) models are frequently used to assess mechanical interactions between orthopedic implants and surrounding bone. However, FE studies often limited by the small number of bones that modeled; use normal do not reflect altered bone density distributions result from osteoarthritis (OA); application simplified load cases usually based on peak forces without consideration tibiofemoral kinematics. To overcome these limitations, we undertook an integrated approach determine most critical scenario for interaction uncemented tibial component proximal A cementless component, a modern design, was virtually implanted using computed‐tomography scans 13 patients with knee OA. simulations were performed across demanding activity, stair ascent, combining in vivo experimental literature kinematics measured who had received same design component. The worst conditions bone–implant interaction, terms micromotion percentage interfacial mass at risk failure, did arise maximum applied loads. We also found large variability among sets. Our results suggest future should focus solely loads as this does consistently correlate worst‐case scenarios. Moreover, multiple be considered best variations kinematics, anatomy, tissue properties. © 2018 Orthopaedic Research Society. Published Wiley Periodicals, Inc. J Orthop Res 37:350–357, 2019.