Background
Mr. Chris Dyrby is a Mechanical Engineer with over 20 years of combined academic and professional experience in accident reconstruction and biomechanical analysis. He holds a Master of Science in Bioengineering from the University of Illinois and conducted advanced research in biomechanics at Stanford University, where he earned the Degree of Engineer in Mechanical Engineering. His research included in-vivo joint loading, orthopedic biomechanics, and motion analysis. He has multiple peer-reviewed publications.
In his current role, Mr. Dyrby applies mechanical and biomechanical engineering principles to analyze incidents involving heavy trucks, passenger vehicles, motorcycles, bicycles, and pedestrians. He conducts detailed investigations using 3D laser scanning and small unmanned aerial vehicle (UAV) photogrammetry, and performs dynamic simulations incorporating event data recorder (EDR) and heavy vehicle engine control module (ECM) data. Mr. Dyrby assesses occupant kinematics and injury mechanisms supporting his expert testimony in litigation matters.
Education and Certifications
- Mechanical Engineering, Degree of Engineer: Stanford University (2001)
- Bioengineering, M.S.: University of Illinois at Chicago (1998)
- General Engineering, B.S.: University of Illinois Urbana-Champaign (1993)
- FAA Licensed Pilot – Single Engine Land
- FAA Licensed Pilot – Small Unmanned Aerial Vehicle
- Heavy Vehicle Forensic Mechanical Inspection: Northwestern University
- Advanced Applications of Heavy Vehicle EDR Data: SAE
- Accessing and Interpreting Heavy Vehicle Event Data Recorders: SAE
- Crash Data Retrieval Technician Level II
- Faro Laser Scanning – Focus 3D and Scene Software
- PIX4D Mapper Certification
Publications
- “A framework for analyzing intersection timing and red light collisions.” In Proceedings of the Human Factors and Ergonomics Society Annual Meeting, vol. 58, no. 1, pp. 549-553. Sage CA: Los Angeles, CA: SAGE Publications, 2014. HFES Annual Meeting, 2014.
- “Secondary motions of the knee during weight bearing and non‐weight bearing activities.” Journal of Orthopaedic Research 22, no. 4 (2004): 794-800.
- “Bilateral posterior stabilized and cruciate retaining total knee replacements compared during stair-climbing.” Trans Orthop Res Soc, San Francisco (2004).
- “Test of a simplified staircase for evaluating lower extremity mechanics.” Gait & Posture 5, no. 2 (1997): 179-180.
- “Relation between knee flexion and tibia-femoral rotation during activities involving deep flexion.” Gait & Posture 5 (1997): 179-180.
- “Functional evaluation of the Scandinavian total ankle replacement.” Foot & Ankle International 25, no. 6 (2004): 377-381.