BIOMENG771: OpenSim Lab: Kinematic

Part A: Kinematics
Task 1: Calculate functional hip joint centre using optimisation method. Use the optimal hip centre location
algorithm of Gamage and Lasenby (2002) (use Jupyter notebook from Tutorial 1) to calculate a functional hip
joint centre for the left and right hip joint using the C3D trials provided (jw_hip_lstar1.c3d and
jw_hip_rstar1.c3d). You will need to export the marker trajectories as a .trc file using Mokka (double check to
make sure the marker labels match what is in your python script…they are case sensitive!). Filter your marker
data using a low-pass Butterworth filter with a cut-off frequency that you think is reasonable. Determine the x,
y, z locations of the left and right hip joint centre in the pelvis coordinate system (refer to the ‘ISB standard hip
CS.pdf’ document).
Task 2: Calculate hip joint centre using regression equations. Tylkowski et al. (1982) published a paper with an
updated set of parameters of a linear regression to estimate the hip joint centre, based upon the distance (d)
between the left and right superior iliac spines (LASIS and RASIS, respectively). The parameters describe the
position of the hip joint centre relative to the ASIS marker, as shown in Figure 1 below. Use the static standing
trial (jw_staticfor.c3d) to obtain the anatomical landmarks. Determine the x, y, z locations of the left and right
hip joint centre in the pelvis coordinate system.
Reference: Tylkowski, C. M., Simon, S. R.,