consistent in the definition so that it would be possible
to compare data between different gait laboratories.
For example, for the flexion+xtension axis
at the knee joint, the line joining the femoral
condyles has been previously suggested by Chao et
al. (5) and Grood and Suntay (7).
The sensitivity analysis also demonstrated that
the error in ab-/adduction and rotation angles increased
with increasing flexion angle at hip, knee,
and ankle joints. In view of this, joint angle patterns