![]() The essential kinematics of the sagittal plane involve the mechanism of the carpal bone motions related to the central column of the wrist formed by the series of articulations among the radius, lunate, capitate, and third metacarpal bone. Wrist flexion is accompanied by a slight ulnar deviation and supination of the forearm.Ī number of concepts have been proposed over the years to explain the biomechanics of wrist motion. Wrist extension is accompanied by a slight radial deviation and pronation of the forearm. These include:Īll of these joints permit motion to occur around two axes: anterior–posterior in flexion–extension, and transverse in radial and ulnar deviation. report this ad Wrist Pronation and Supination Movement of the Hand on the Forearmĭue to the morphology of the wrist, movement at this joint complex involves a coordinated interaction between a number of articulations. A change in the length of the ulna of as little as 2 mm results in a change in the transmission of forces of 5–40 percent. This configuration and distance maintains ligament and muscle tension. The proximal and DRUJs are intimately related biomechanically, with the function and stability of both joints dependent on the configuration of, and distance between, the two bones. At this position, the TFCC is maximally stretched and the interosseous membrane is relatively lax. Supination is limited by the interosseous membrane and the bony impaction between the ulnar notch of the radius and the ulnar styloid process.Ĭongruency of the DRUJ surfaces is maximal at midrange of motion, although the joint is not considered to be truly locked in this position. Pronation is limited by the bony impaction between the radius and the ulna.Īpproximately 85–90 degrees of forearm supination is available. During pronation, the concave ulnar notch of the radius glides around the peripheral surface of the relativelyįixed convex ulnar head. The true axis for pronation–supination at the wrist may be situated anywhere between the radial and ulnar styloid, resulting in not one, but many pronation–supination axes.Īpproximately 75–90 degrees of forearm pronation is available. See Also: Wrist Anatomy Wrist Pronation and Supination The apparent axial rotation of the palm -called pronation and supination- occurs at the proximal and DRUJs, with the hand moving with the radius, not separately from it. ![]() The Wrist Movements are limited to two degrees of freedom: flexion–extension and ulnar–radial deviation The wrist is the key joint of the hand and contains several segments whose combined movements create a total of wrist range of motion that is greater than the sum of its individual parts. Hand movements include flexion / extension, rotation and adduction / abduction at the MCP joints, while the wrist movements include flexion /extension, in order to radial and ulnar deviation. ![]()
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