Title: Comparison of in vivo contact positions for PS and PCR TKA implants using Lowest Point and full-contact techniques

Authors: Saikat Pal, Mohamed R. Mahfouz, Richard D. Komistek, Paul J. Rullkoetter

Addresses: University of Denver, 2390 S. York St., Denver, CO 80208, USA. ' Mechanical, Aerospace, and Biomedical Engineering Department, University of Tennessee, 307 Perkins Hall, Knoxville, TN 37996, USA. ' Mechanical, Aerospace, and Biomedical Engineering Department, University of Tennessee, 301 Perkins Hall, Knoxville, TN 37996, USA. ' Department of Engineering, University of Denver, 2390 S. York, Denver, CO 80208, USA

Abstract: Evaluation of in vivo tibiofemoral contact following total knee arthroplasty provides valuable feedback to clinicians and researchers. The objective of the present study was to evaluate in vivo contact positions using a combination of fluoroscopy and Finite Element (FE) modelling. Center-of-Pressure (COP) contact locations from FE models were compared to Lowest Point (LP) results. Six P.F.C^® Sigma Posterior Stabilised (PS) and 6 P.F.C^® Sigma Posterior Cruciate Retraining (PCR) implants were analysed during weight-bearing knee flexion from 0° to 90°. Statistically significant differences were observed between the means of anterior-posterior contact position from the LP and COP methods (α = 0.05).

Keywords: TKA; video fluoroscopy; tibiofemoral contact; knee kinematics; FEM; finite element method; modelling; full-contact analysis; lowest point contact; COP; centre-of-pressure contact; total knee arthroplasty; weight-bearing knee flexion; implants; contact positions.

DOI: 10.1504/IJBET.2011.039200

International Journal of Biomedical Engineering and Technology, 2011 Vol.5 No.2/3, pp.229 - 246

Published online: 21 Jan 2015 *

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