Dr. Rimnac specializes in physical and mechanical characterization of biologic and non-biologic orthopaedic materials, with particular emphasis on fatigue and fracture behavior and failure analysis. Specific efforts include: characterization and constitutive modeling of the cyclic and static mechanical performance of ultra high molecular weight polyethylenes, acrylic polymers, and other non-resorbable and resorbable polymeric biomaterials as a means of understanding in-vivo failure mechanisms and of improving performance; failure and damage analysis of orthopaedic and other medical implants removed at revision or re-operation surgery to determine the cause of failure and the mechanisms responsible for the damage; and, identification of ultrastructural and microstructural mechanism(s) for permanent deformation in normal, treated (e.g., radiation sterilized), and diseased bone tissue. Dr. Rimnac is the Wilbert J. Austin Professor of Engineering in the Department of Mechanical and Aerospace Engineering in the Case School of Engineering at Case Western Reserve University, Cleveland, Ohio. Dr. Rimnac also holds secondary appointments in Biomedical Engineering and Orthopaedics.