The proposed study consists in moving several bones such as pelvis, fe
mur and tibia in conditions as similar as possible to those obtained i
n a walking subject, to evidence the functioning of this hip and knee
joints. The analysis is performed during the stance phase when the joi
nts are loaded. This study is the first phase of a research consisting
in: (i) the visualization of the motion of joints in both normal and
pathologic subjects; and (ii) the calculation in real time of articula
r loading caused by muscular forces when sustaining both the external
and inertial loads. This research will provide the kinematic and dynam
ic boundary conditions applied to both a knee and a hip prosthesis of
the patient in movement.