The functional position of the wrist refers to the position of the wrist joint when the hand can function at its maximum, which is different from the rest position. The angle of dorsal extension of the wrist joint in the functional position is greater than that in the rest position, about 20-25 degrees dorsal extension, about 10 degrees ulnar deviation, the thumb is located in the full external booth, the metacarpophalangeal and interphalangeal joints of the thumb are in a slightly flexed position, the fingers of the middle ring little finger are lightly separated, the flexion of each metacarpophalangeal or interphalangeal joint is basically the same, that is, the metacarpophalangeal and proximal interphalangeal joints are in a semi-flexed position, while the distal interphalangeal joint is in a slightly flexed position. The distal interphalangeal joint is slightly flexed. The resting position of the wrist refers to the state of the wrist at rest, which is a semi-clenched fist position. In the resting position, the wrist joint is mildly dorsiflexed, which is about 10-15 degrees less than the functional position of the wrist.