Professor Roger Gonzalez
Menzies Health Institute Queensland Program Seminar Series
Disability and Rehabilitation (GCORE)
Presenter: Professor Roger Gonzalez
Title: A New Approach to Mutiplanar, Real-time Simulation of Physiological Knee Load with Implications Towards Using Local Composition Control in Additive Manufacturing for Orthopedic Implants
The purpose of our research is to develop repeatable simulation of physiological loads and develop techniques to fabricate a synthetic-based replacement of cadaver specimens. Our recent endeavors consists of (a) the development of the University of Texas Joint Load Simulator (UTJLS), which can apply physiological loads with synchronous application of ground reaction forces, joint kinematics, and muscle forces, (b) advances in technology and methods for Local Composition Control (LCC) in Fused Filament Fabrication (FFF) and investigates the viability of commercially available filaments for application as synthetic tissue and (c) development of a synthetic femoral anterior cruciate ligament (ACL) tibial complex (FATC) and describing its mechanical response to tensile loads applied in two different directions.
From our research in LCC in FFF, we are developing a novel process to blend Polyether-ether-ketone (PEEK) with functional gradients of PEEK + Carbon Fiber (CF) composites and PEEK + hydroxyapatite (HA) composites. These blends will help mitigate stress concentrators that are commonly observed in orthopedic implants. However, printed (PEEK) parts often warp, crystallize inconsistently, have minimal fusion between layers, and density inconsistencies. Our current research is implementing multiple heating sources with novel feedback control to optimize temperature profiles during printing to minimize unwanted temperature gradients while improving melt and flow characteristics. Unlike techniques described in literature, our laboratory seeks to directly control temperature of the printed part at its top and bottom surfaces throughout the entire printing process. Development of this technology will help to overcome critical barriers that are preventing industries from using FFF to fabricate functional parts, ultimately supporting our laboratory's current research endeavors to increase life, resilience, and functionality of orthopaedic implants.
Roger V. Gonzalez is the Inaugural Chairman and Professor of the Dept of Engineering Education and Leadership. He also serves as the Director of the Engineering Leadership program for the College of Engineering. Dr. Gonzalez earned a B.S. in Mechanical Engineering in 1986 from UTEP. He earned his M.S. in Biomedical Engineering and Ph.D. in Mechanical Engineering from The University of Texas at Austin and was a Post-Doctoral Fellow and the premier Rehabilitation Institute of Chicago and Northwestern Medical School. Professor Gonzalez has been recognized for scholarly work, education innovation and socio-entrepreneurial humanitarian efforts. He is known and respected for actively incorporating students into all three of these areas. Among many highlights of his scholarly work, he is a Fellow of the American Society of Mechanical Engineers (ASME), a Fellow of the American Institute for Medical and Biological Engineering (AIMBE) and was awarded a prestigious National Institutes of Health (NIH) National Research Service Award for his work in neuromuscular control and musculoskeletal biomechanics on children with juvenile rheumatoid arthritis. Dr. Gonzalez's scholarly work includes over 100 publications in journals and conference proceedings many of which are co-authored with his students.
For his efforts and innovation in engineering education Dr. Gonzalez has received the American Society of Engineering Educators (ASEE) Teaching Award, the Minnie Stevens Piper Foundation Award. He was also a Finalist for the IEEE Global Humanitarian Engineer of the Year award in 2013. He serves as an engineering program evaluator for the Accrediting Board for Engineering and Technology (ABET).
Dr. Gonzalez is Founder and former CEO and President of LIMBS International (www.limbs.org), one of the most recognized international providers of low-cost prosthetic components to the world. LIMBS is a 501(c)3 non-profit humanitarian organization that designs, creates and deploys prosthetic devices to transform the lives of amputees in the developing world by restoring their ability to walk. Since its founding in 2004, the LIMBS Knee has helped thousands of amputees in over 50 countries on four continents.
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