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Research Paper

Computer-Aided Engineering Approach for Parametric Investigation of Locked Plating Systems Design

[+] Author and Article Information
Joshua C. Arnone

Fellow
Biodesign and Innovation Program,
Department of Surgery,
University of Missouri,
Columbia, MO 65212,
e-mail: arnonej@health.missouri.edu

A. Sherif El-Gizawy

Professor and Director
Industrial Technology Development Center,
Mechanical and Aerospace Engineering,
University of Missouri,
Columbia, MO 65211,
e-mail: elgizawya@missouri.edu

Brett D. Crist

Associate Professor

Gregory J. Della Rocca

Associate Professor
Orthopaedic Surgery,
University of Missouri,
Columbia, MO 65212

Carol V. Ward

Professor
Pathology and Anatomical Sciences,
University of Missouri,
Columbia, MO 65212

Manuscript received October 20, 2010; final manuscript received April 17, 2013; published online June 24, 2013. Assoc. Editor: Vijay Goel.

J. Med. Devices 7(2), 021001 (Jun 24, 2013) (8 pages) Paper No: MED-10-1093; doi: 10.1115/1.4024644 History: Received October 20, 2010; Revised April 17, 2013

The present paper presents an integrated computer-aided engineering (CAE) approach combining digital imaging, solid modeling, robust design methodology, and finite element analysis in order to conduct a parametric investigation of the design of locked plating systems. The present study allows for understanding the contributions of different design parameters on the biomechanics and reliability of these systems. Furthermore, the present approach will lead to exploration of optimum design parameters that will result in robust system performance. Three-dimensional surface models of cortical and cancellous femoral bone were derived via digital computed tomography (CT) image processing techniques and a medical imaging analysis program. A nine orthogonal array matrix simulation (L9) was conducted using finite element methods to study the effects of the various design parameters on plate performance. The introduced technique was demonstrated and experimentally verified on a case study using a Smith & Nephew PERI- LOC distal femur locking plate and a Synthes Less Invasive Stabilization System (LISS).

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References

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Figures

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Fig. 1

Integrated CAE approach for design and optimization of internal fixation systems

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Fig. 2

Virtual surgery CAD model

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Fig. 3

Distal end of CAD model with screw-hole inserts and oblique screw

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Fig. 4

Load amplitude function during walking [25]

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Fig. 5

Distal end of finite element mesh

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Fig. 6

Stress field contour plot (simulation No. 2, plate only)

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Fig. 7

Fracture model with Synthes LISS (far left: fracture with bone loss; right three: distal transverse fracture)

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Fig. 8

Experimental testing of intact femur fixated with Synthes LISS (left) and three-directional strain gauge rosette placed on distal end of Synthes LISS (right)

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