| Summary: | 碩士 === 國立成功大學 === 醫學工程學系 === 81 === The biomechanics of the lower limb was analysized for young(age
from 20 to 30) and old(age from 50 to 70) normal subjects and
patients with varus gonarthrosis while rising from a seated
position. The motion analysis system and two force-plate were
used to collect the trajectories of the body movement and
ground reaction forces of two feet, while the subjects rose
from the chairs with four chair heights, 65\%, 80\%, 100\%and
115\% of the knee height. By kinematic and kinetic analysis,
the Euler angles and net muscle moments of each joint were
calculated for further clinical interpretation. The result
indicated that the maximum moments of the three joint soccurred
nearly the beginning of extension phase. As the chair height
increased, the maximum flexion angles at the hip, knee, and
ankle joints significantly decreased. The chair height had
great influence on knee joint moment, but less on ankle and hip
joints. There were consistent right-to-left asymetry present
during rising from all chair height. All the subjects are right
hand dominants, and the result showed the joint moments and
angles of right leg were sigificantly greater than those of
left leg. The range of motion of patients was quite larger than
normals. The magnitude of moments highly depended on personal
condition. The result of this experiment could be considered as
design criteria of prosthetic devices for the lower extremity
and could give some suggestion to patients with patholagic
conditions of lower limbs.
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