Fig. 4: Comparison of angles measured by the electrogoniometry systems to those from 3D marker tracking.

Still shots from high-speed videos captured during experiments (left), positions of markers tracked in 3D space (center), and joint angles estimated by 3D marker tracking alongside device measurements (right) during flexion/extension motions of the fingers (a, b) and wrist (c), as well as radial/ulnar motions of the wrist (d).