Wrist joint

The wrist joint (art radiocarpea) is the articulation of the bones of the forearm with a brush. The joint is formed by the carpal joint surface of the radius and the articular disc having a triangular shape, as well as the proximal row of the wrist bones (scaphoid, semilunar, trihedral bones). The joint capsule is thin, attached at the edges of the articulating surfaces, strengthened with ligaments.

• The radial collateral ligament of the wrist (lig. Collaterale carpi radiale) begins on the styloid process of the radius and goes to the scaphoid bone.
• The ulnar collateral ligament of the wrist (lig. Collaterale carpi ulnare) comes from the styloid process of the ulna to the trihedral and pea-bony bones of the wrist.
• The palmar radiocarpeum palmare connects the anterior edge of the joint surface of the radius with the bones of the first wrist series (navicular, semilunar, trihedral), and also with the head bone.
• The rear radiocarpeal dorsale (lig. Radiocarpeum dorsale) extends from the posterior edge of the articular surface of the radius and is attached to the back of the wrist bones located in the first row by several beams.

In its structure, the wrist joint is complex, and in the shape of the articular surfaces it is ellipsoidal with two axes of motion (frontal and sagittal).

In the radiocarpal joint, ellipsoidal in shape, relative to the frontal axis, flexion is performed-extension of the hand within the range of up to 100 °, the movement around the sagittal axis (retraction-reduction) is possible up to 70 °. Circular motion in the wrist joint is the addition of successive motions with respect to the sagittal and frontal axes.