Research Update

Dr. Abouhossein has made excellent strides in his research on the validation and dynamic responses of 3-Dimensional multibody model of a physical surrogate neck and head under compressive follower load during axial impact using Adams.

He presented his paper, "Ligaments Degeneration May Affect Body Sway in the Elderly" at the 2013 European Biomechanics Conference in Greece in August.

Dr. Alireza Abouhossein
University of Bologna, Italy

RESEARCH GOALS: Dr. Abouhoussein and the research team at the University of Bologna are developing a 3-dimensional multibody model of a neck and head and are analyzing under compressive follower load during axial impact.


  • Gain a deeper understanding of the biomechanical responses of the head and neck in various environments.
  • Optimize injury preventive devices.

MSC RESEARCH ASSIST AWARD: Dr. Abouhossein and the University of Bologna were awarded Adams to simulate head-first impact and to understand both the kinematics and kinetics responses of the neck.

BIO: Dr. Alireza Aboussein holds a PhD in Science with an emphasis in biomechanics, Magna Cum Laude from the University of Bern, Switzerland. He has also earned a B.Eng in mechanical engineering from Ryerson University in Toronto and a M.E.Sc in mechanical engineering from the University of Western Ontario in London, Canada.

Mr. Abouhossein's research interests include computational modeling of impact, injury, dynamic modeling of injury biomechanics, specifically spinal cord injuries, postural control strategies in elderly, passive, and active muscle consideration during a gait or quiet balance control as well as developing objective measures to prevent injuries.



Currently, Dr. Abouhossein is using Adams for three concurrent projects:

  1. Validation and Dynamic Responses of a 3-Dimensional Multibody Model of a Physical Surrogate Neck and Head Under Compressive Follower Load and During Axial Impact Introduction.
    1. An in silico model of an already physical model of a surrogate head and neck with and without compressive load is being validated for different angle of impact and velocity of impact.
    2. The buckling modes and local neck loading curves will be measured for comparison
    3. A validated simulation model of head and neck will be obtained by identifying the difference in responses of the physical model and a simulated model and the effect of different parameters on the biomechanical response of the simulated model.
  2. A Double Inverted Pendulum and Relation of Upper Body to Sensorimotor Integration to Spinal Stabilization in Humans During Quiet Standing
    1. Investigate stability issues based on upper body velocity center of mass (CoM) and Torque generated about each joint about ankle, hip in sagittal plane along with frontal plane upper body (UB) sway about L4/L5.
    2. This investigation is evaluated with two controller types: regular and intermittent PD controller and reported for its stability.
    3. This study will potentially aid the biomechanist to understand the stability issues in the elderly and how stability in a human bipedal may be predicted objectively.
  3. Lumbar Spine Facet Joint Loads and Effect of Loading Rate in a Low Speed Rear-End Impact Collision.
    1. A complete set of passive anatomical structures of the lumbar spine, including the facet joint and set of nonlinear rotational stiffness values for the intervertebral disc have been considered.
    2. A physiological compressive follower load has been applied, simulating the equivalent muscle forces along the path of the lumbar curvature.

The intention is to explore the correlation between the follower load magnitude and the magnitude of facet forces, as well as understanding the biomechanical mechanism of injury across the facet joints.