Estimation of the Abduction/Adduction Movement of the Metacarpophalangeal Joint of the Thumb

Thumb opposition is essential for grasping, and involves the flexion abduction of carpometacarpal metacarpophalangeal joints thumb. The high number degrees freedom thumb in a fairly small space makes vivo recording its kinematics challenging task. For this reason, along with very limited independence movement joint, many devices do not implement sensors to measure such movement, which may lead important implications terms accuracy models. aims work are examine correlation between obtain an equation that allows abduction/adduction be estimated from other joint motions thumb, during commonest grasps used activities daily living free movement. analysis shows can expressed mainly movements. model thus obtained presents low estimation error (6.29°), no significant differences grasps. results could benefit most fields typically include as virtual reality, teleoperation, 3D modeling, prostheses, exoskeletons.