Artificial wrist joint

An artificial wrist joint permitting flexion and extension movements comprising a distal spherical bearing member for attachment to at least one of a capitate bone and a hamate bone of a patient, a platform adapted to be attached to a radius bone of the patient, said platform forming a proximal guide surface, an intermediate member for replacing the scaphoid, lunate and triquetral bones in a proximal carpal row of the patient and configured to be disposed between said distal spherical bearing member and said platform, said intermediate member having a distal end facing said bearing member having a spherical counter-surface for engaging said distal spherical bearing member and a proximal end facing said platform said proximal end having a sliding surface for engaging and sliding along said proximal guide surface thereby displacing said sliding surface at right angles to a longitudinal axis of the radius, said proximal guide surface and said sliding surface having a common generatrix with an axis of rotation which is perpendicular to a plane common to the radius bone and the ulna bone of the patient and located beyond the artificial wrist joint in a distal direction.