A thorough knowledge of the anatomy around the wrist is essential. The following images give a short introduction.
1. Soft tissue anatomy - dorsal
I. Abductor pollicis longus and extensor pollicis brevis II. Extensor carpi radialis longus and brevis III. Extensor pollicis longus IV. Extensor digitorum communis and extensor indicis proprius V. Extensor digiti minimi VI. Extensor carpi ulnaris
Superficial radial nerve
Dorsal branch of ulnar nerve
2. Soft tissue anatomy - palmar
Flexor carpi radialis tendon
Motor branch of the median nerve
Pronator quadratus muscle
Flexor digitorum profundus tendons
Flexor digitorum superficialis tendons
Palmar cutaneous branch of the median nerve
3. Bony anatomy
4. Principle of columns
The distal forearm may be thought of in terms of three columns. The ulna forms one column. The radius may be thought of as an intermediate and a radial column.
Distally at the wrist joint, the radial column articulates with the scaphoid and the intermediate column articulates with the lunate.
The ulnar column terminates distally at the TFCC.
The watershed line represents the margin between the structures which may be elevated proximally and the capsule of the wrist joint which should be respected.