Radiokarpalbänder

Radiokarpalbänder, also known as radiocarpal joints, are the primary synovial joints of the wrist. They connect the distal radius and ulna of the forearm to the carpal bones of the hand. Specifically, the radiocarpal joint involves the distal articular surface of the radius, the articular disc of the distal radioulnar joint, and the proximal row of carpal bones, which include the scaphoid, lunate, and triquetrum. The joint is a condyloid or ellipsoid joint, allowing for movement in two planes: flexion/extension and radial/ulnar deviation.

The complex structure of the radiocarpal joint is supported by a robust network of ligaments, including the volar and dorsal radiocarpal ligaments, as well as the ulnar and radial collateral ligaments. These ligaments provide stability and control the range of motion. The joint capsule is reinforced by these ligaments and encloses the synovial cavity. The primary movements at the radiocarpal joint are flexion, extension, radial deviation, and ulnar deviation. Pronation and supination of the forearm occur primarily at the proximal and distal radioulnar joints, although some degree of rotation is indirectly influenced by the wrist's position.

Injuries to the radiocarpal joint are common and can include fractures of the radius or ulna near the wrist, sprains of the supporting ligaments, and dislocations of the carpal bones. These injuries can result from falls, direct trauma, or repetitive stress. The function of the radiocarpal joint is crucial for hand and arm dexterity, enabling a wide range of activities from fine motor tasks to powerful gripping.