One of the most common debates in discussing the technique of isolated subtalar joint arthrodesis is whether a single point of fixation is adequate to achieve joint fusion. The single screw technique places a fixation device in line with the subtalar joint axis of motion. Regardless of whether the screw is run up from the plantar calcaneus or down from the talar neck, rotational movement can oc...

PURPOSE To test the feasibility and accuracy of measuring joint motion with real-time MRI in a 1.5T scanner and in a 0.5T open-bore scanner and to assess the dependence of measurement accuracy on movement speed. MATERIALS AND METHODS We developed an MRI-compatible motion phantom to evaluate the accuracy of tracking bone positions with real-time MRI for varying movement speeds. The measurement...

Markerless motion capture systems have developed in an effort to evaluate human movement in a natural setting. However, the accuracy and reliability of these systems remain understudied. Therefore, the goals of this study were to quantify the accuracy and repeatability of joint angles using a single camera markerless motion capture system and to compare the markerless system performance with th...

[Purpose] Motion capture system is difficult to use in daily life. The aim of this study was to propose an estimation model for knee and ankle joint angle measurements and locate body center of gravity (COG) of the extension phase during standing-up motion. [Subjects and Methods] Seven healthy male volunteers were enrolled. An estimation model was proposed for the knee and ankle joint angle mea...

A dexterou s motion control method of redundant robot manipulators based on nonlinear optimizatio n method is proposed t o satisfy multi-criteria such a s singularit y avoidance, minimizing energy consumption ,and avoiding physical limits of actuator, while performing a give n task. The method employs a neural optimization network with parallel processing capability as a nonlineae optimization ...

BACKGROUND In vitro investigations have demonstrated the importance of the ribcage in stabilizing the thoracic spine. Surgical alterations of the ribcage may change load-sharing patterns in the thoracic spine. Computer models are used in this study to explore the effect of surgical disruption of the rib-vertebrae connections on ligament load-sharing in the thoracic spine. METHODS A finite ele...

BACKGROUND The flexor digitorum superficialis (FDS) and flexor digitorum profundus (FDP) are critical for finger flexion. Although research has recently focused on these tendons' coactivity, their contributions in different tasks remain unclear. This study created a novel simultaneous approach to investigate the coactivity between the tendons and to clarify their contributions in different task...

Motion can be described in several alternative representations, including joint configuration or end-effector spaces, but also more complex topology-based representations that imply a change of Voronoi bias, metric or topology of the motion space. Certain types of robot interaction problems, e.g. wrapping around an object, can suitably be described by so-called writhe and interaction mesh repre...