The distal radioulnar joint is a pivot-type synovial joint between the distal radius and ulna.
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Summary
articulation: pivot-type synovial joint between the ulnar notch of the distal radius and the ulna head
movement: rotation of the distal radius
ligaments: triangular ligament, and anterior and posterior distal radioulnar ligaments
blood supply: anterior and posterior interosseous arteries
nerve supply: anterior and posterior interosseous nerves
Gross anatomy
Articulation
The distal radioulnar joint is a pivot-type synovial joint existing between the ulnar notch of the distal radius and the head of the ulna. The primary uniting structure of the joint is the articular disc of the distal radioulnar joint, also termed the triangular ligament 1 which is part of the triangular fibrocartilage complex (TFCC).
Movement
The primary movement of the distal radioulnar joint is to allow pronation and supination of the forearm.
pronation: pronator quadratus, pronator teres
supination: supinator, biceps brachii
Ligaments and tendons
The distal radioulnar joint has intrinsic and extrinsic stabilizing structures.
Intrinsic
anterior and posterior distal radioulnar ligaments
distal radioulnar joint capsule
Extrinsic
Arterial supply
The blood supply to the distal radio-ulnar joint is provided by the:
dorsal and palmar branches of the anterior interosseous artery
radiocarpal branches of the ulnar artery
Innervation
The nervous supply to the distal radioulnar joint is provided by the:
anterior interosseous nerve (branch of the median nerve)
posterior interosseous nerve (branch of the radial nerve)
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