About Our Joint Mechanics Research


In general, cadaveric models of the shoulder evaluate discrete motion segments using the glenohumeral joint in isolation over a defined trajectory. Currently, our system takes a glenohumeral joint and affords the ability to continuously and passively move the humerus in 3D-space while applying load to the rotator cuff muscles with a closed-loop controller. The system also records joint kinematics (3D position data of the scapula and humerus) and kinetics (joint compression at the scapula), and can accept a full torso.

The testing system consists of a lower frame (to move the torso) and an upper frame (to move the arm) using seven actuators. The system actuators accurately reproduce planned trajectories. Motion can be recorded with an electromagnetic position and orientation tracking system (Polhemus Liberty) or with an infrared camera system (Qualysis ProReflex).

Our current work focuses on tissue level, biomechanical, simulation, and patient studies to better understand the structure and function of the glenohumeral joint with respect to shoulder motion and pathology. Our goal is to provide evidenced-based feedback to improve upper extremity clinical care.

Selected Publications:

  • Williamson (2019) – 30514628
  • Rosso (2017) - 28060814
  • Haghpanah (2016) - 26818612
  • Walley (2016) - 27855670
  • DeAngelis (2015) - 26535390
  • Mueller (2014) - 25201441
  • Rosso (2014) – 26914759
  • Rosso (2013) - 23883431
  • Mueller (2013) –23313371
  • Entezari (2012) – 23610675