Technical Brief

Validation of a Finite Element Humeroradial Joint Model of Contact Pressure Using Fuji Pressure Sensitive Film

[+] Author and Article Information
Sunghwan Kim

University of Pittsburgh,
401 Shady Avenue Apartment B401,
Pittsburgh, PA 15206
e-mail: ksh1220@gmail.com

Mark Carl Miller

Allegheny General Hospital,
University of Pittsburgh,
320 East North Avenue,
Pittsburgh, PA 15212
e-mail: mcmiller@wpahs.org

Manuscript received November 26, 2014; final manuscript received October 20, 2015; published online November 23, 2015. Assoc. Editor: Zong-Ming Li.

J Biomech Eng 138(1), 014501 (Nov 23, 2015) (4 pages) Paper No: BIO-14-1590; doi: 10.1115/1.4031976 History: Received November 26, 2014; Revised October 20, 2015

A finite element (FE) elbow model was developed to predict the contact stress and contact area of the native humeroradial joint. The model was validated using Fuji pressure sensitive film with cadaveric elbows for which axial loads of 50, 100, and 200 N were applied through the radial head. Maximum contact stresses ranged from 1.7 to 4.32 MPa by FE predictions and from 1.34 to 3.84 MPa by pressure sensitive film measurement while contact areas extended from 39.33 to 77.86 mm2 and 29.73 to 83.34 mm2 by FE prediction and experimental measurement, respectively. Measurements from cadaveric testing and FE predictions showed the same patterns in both the maximum contact stress and contact area, as another demonstration of agreement. While measured contact pressures and contact areas validated the FE predictions, computed maximum stresses and contact area tended to overestimate the maximum contact stress and contact area.

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Grahic Jump Location
Fig. 1

Front (left) and side view (right) of the native elbow FE mesh

Grahic Jump Location
Fig. 2

Maximum contact stress (top left), contact area (top right), and contact stress distributions (bottom)

Grahic Jump Location
Fig. 3

Comparison of the maximum contact stress (left) and the contact area (right) between when the bone was modeled as a whole cancellous bone and a whole cortical bone ((a) and (b)), with three different cartilage thicknesses on the radial head side ((c) and (d)), and with three different ligament stiffnesses ((e) and (f))




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