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/suÂ·piÂ·naÂ·tion/ (sooâ³pÄ­-naÂ´shun) [L. supinatio ] the act of assuming the supine position, or the state of being supine. Applied to the hand, the act of turning the palm forward (anteriorly) or upward, performed by lateral rotation of the forearm. Applied to the foot, it generally implies movements resulting in raising of the medial margin of the foot, hence of the longitudinal arch.
Thumb Abduction. The thumb abducts in the same plane the other fingers flex - a plane 90 degrees to the palm. The thumb abduction motion begins with the thumb aligned with second metacarpal. The movement, occurring only at the carpometacarpal (CMC) joint, brings the thumb away from the palm. Be aware that practitioners refer to thumb abduction in a plane 90 degrees to the palm as palmar abduction.