Opposition and reposition are special body movements of the thumb. Opposition involves abduction and flexion, allowing the thumb to meet (and oppose) the tips of any of the fingers on the same hand.
The thumb (metacarpal 1) articulates with the trapezium bone of the carpus via a saddle joint. This joint allows the thumb to perform flexion, extension, circumduction, abduction, adduction, as well as the special movements of opposition and reposition.
Opposition is the movement of the thumb so that it touches any of the digits of the hand.
Reposition is very simple: It involves returning the thumb/fingers to their original position.
This video also includes a couple of memory tricks to help you remember opposition.
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