We have shown here that comparable success in terms of screening ‘‘at risk’’ people based on relatively large knee
valgus motions may be possible using a 2D camera approach. However, these results should be considered within the
limitations inherent in 3D analysis methods. Errors in defining anatomical landmarks by external skin markers,
for example, have a direct effect on the position and orientation of resultant joint axes, culminating in the
potential for significant errors in kinematic calculations.
Similarly, excessive marker movement stemming from the
high impact forces synonymous with these movements will
probably compromise data integrity.
35
As noted above, the 3D
kinematic data in this study were generated using Mocap
Solver 6.17, which performs model based kinematic analysis
through global least squares optimisation.
22
We have success-
fully used this method to detect relatively small sex
differences in lower limb kinematics during similar high
impact movements.
20
Also, the optimised least squares
approach allows the removal of markers that may be more
prone to impact error, such as the anterior thigh marker,
from the analyses