Carrying Angle ➦ The transverse axis of the elbow joint is directed medially and downwards. Because of this the extended forearm is not in straight line with the arm, but makes an angle of about 13 degrees with it. This is known as the carrying angle. The factors responsible for formation of the carrying angle are as follows.
a. The medial flange of the trochlea is 6 mm deeper than the lateral flange.
b. The superior articular surface of the coronoid process of the ulna is placed oblique to the long axis of the bone.
The carrying angle disappears in full flexion of the elbow, and also during pronation of the forearm. The forearm comes into line with the arm in the midprone position, and this is the position in which the hand is mostly used.
This arrangement of gradually increasing carrying angle during extension of the elbow increases the precision with which the hand (and objects held in it) can be controlled .
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