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FIGURE 7.45 The radioulnar joints (right forearm). (A) Position of supination, (B) position of pronation, (C) change in
hand position with supination and pronation.A B C
Combining Shoulder Rotation With Forearm Movements
to Facilitate Positioning of the HandUse the following exercise to demonstrate how combining shoulder rotation with forearm pronation
and supination can allow more range of motion for the hand.
Hold one arm out in second position with the palm facing up. Then, leading with the thumb, pronate
the forearm and internally rotate the shoulder, and note where the thumb is facing in the end posi-
tion. Next, just pronate the forearm without letting the shoulder internally rotate. Lastly, just internally
rotate the shoulder without allowing any movement in the forearm. Compare the range of motion as
evidenced by the facing of the thumb at the end position for each of these three conditions.