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The purpose of this study was to use digital videofluoroscopy to identify motion patterns of the lumbar spine during coronal movement in asymptomatic (normal) subjects and patients with herniated nucleus pulposus (HNP).Videofluoroscopic lumbar coronal motion was recorded in 18 asymptomatic volunteers and 9 patients with HNP. Measurements were made while patients bent laterally and rotated toward the...
This paper proposes a new spatial 3-DOF parallel mechanism with a unique forward kinematic solution. Using the Scott mechanism as its sub-chain, the mechanism is foldable, which is useful for design of a compact-sized master device. The kinematics of this mechanism is derived and its kinematic characteristics are analyzed in terms of workspace and kinematic isotropy. The mechanism was implemented...
This paper deals with the kinematics and optimization of a parallel mechanism with a suspended platform. The proposed mechanism has a unique appearance in that the 6 chains originating from a circular ring are connected to both ends of a suspended platform. After introducing the kinematics, the architectural singularity is analyzed and the design is optimized to minimize the architectural singularity...
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