1 — Radial styloid process; 2 — Radius, carpal articular surface; 3 — Distal radio-ulnar joint; 4 — Extensor carpi ulnaris; Tendon; 5 — Palmar radioulnar ligament; 6 — Head of ulna; 7 — Dorsal radio-ulnar ligament; 8 — Ulnar styloid process; 9 — Dorsal tubercle; 10 — Radial styloid process; 11 — Ulnar notch; 12 — Articular circumference