| Summary: | 碩士 === 國立成功大學 === 醫學工程學系 === 81 === The tearing or injury of the knee ligament may cause bad
articulation during the joint movement. To prevent further
injury of the knee joint, an exterior artificial joint such as
a knee brace is needed to assist the knee's action during the
therapy of rehabilitation. By kinematic data, the study aims to
design an exterior artificial knee joint suitable to the
oriental as well as to serve as a tool in clinical diagnosis,
estimation of the knee joint diseases, and improvement the
surgical treatment, etc. Except refering to former study on
knee kinematics during level walking for the knee brace design,
twelve normal male subjects were asked to perform three kinds
of activities including upstairs and downstairs. The kinematic
data were collected at least six times for each activity. We
calculated the paramenters of the screw axis, the angles of the
relative motion, and the of the motion of the medial and
lateral epicondyles of the femur from the position of
reflective markers. Because of the larger range of motion on
the sagittal plane for stand-squat activity, thus, the motion
patterns of the knee are adopted for the design of the knee The
result showed that when the knee is flexed, the relative
backward and downward motion of the lateral epicondyle is
larger than that of the medial epicondyle. When the tibia is
flexed toward the femur, it rotates internally and varusly to
the femur, and vice versa. Moreover, the direction of the knee
screw axis changes abruptly at the transition of extension and
flexion. And the angle of rotation of the screw is proportional
to the angular velocity of the knee flexion. As a matter of
fact, we use cam-slot and pin-slot mechanism to design knee
brace for the protection of the knee ligament.
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