Biomedical Engineering Reference
In-Depth Information
Figure 3.7.
Segment (SCS) and Joint (JCS)
Coordinate Systems of the hip
The “JCS” of the hip is therefore formed from an axis of
the proximal segment (pelvis),
, and an axis of the distal
. The third axis of the JCS, the floating
axis, is perpendicular at all instances, perpendicular to these
two axes. Finally, the order of the rotation sequence is
Z-X-Y, corresponding to flexion/extension about axis
segment (femur),
,
followed by abduction/adduction about the floating axis
and finally internal/external rotation about axis
.
Wherever possible, we should comply with these
recommendations to allow the comparison and compilation of
data from different studies. Nevertheless, for some joints,
these recommendations cannot be used in the analysis of all
movements. In particular, this is the case for the
glenohumeral joint in the shoulder complex, between the
humerus and the scapula. For this joint, the ISB
recommends the rotation sequence Y-X-Y, corresponding to
the orientation of the elevation plane of the arms about axis
attached to the scapula, followed by elevation about the
