Dr. Kevin Yip

Dr Kevin Yip
Orthopaedic Surgeon
MBBS(UK), FRCS(EDIN), FAM(SING), FHKCOS(ORTHO)

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Dorsal

Radius and ulna are easily palpable. The styloid process of the radills descends a bit further distally than the styloid process of the ulna. The distal radioulnar joint can be recognized by grasping the distal end of the radius with one hand and the distal end of the ulna with the other, and by moving both hands in opposite
directions. The distal border of the radius is sharp and can be felt as being the proximal border of the radiocarpal joint, which a has a wide joint line.One finger-width more proximally, on the dorsal aspect of the radius, a nodular bone can be felt.

This is the dorsal tubercle of the radills which forms an important landmark. At the ulnar side the thick head of the ulna is palpated.The carpal bones consist of two rows. In the proximal row lie the scaphoid, lunate, triquetral and pisiform bones.
Distal to the inferior border of the radius, two bones can be palpated. The most radial one is the already detected scaphoid bone. It is felt more clearly during ulnar deviation of the wrist. The most ulnar bone is the lunate bone , which
is palpable on a flexed wrist. Ulnar to the lunate and articulating with the ulna lies the triquetral bone. It is felt to move when the hand is again brought into radial deviation.

The distal row contains the trapezium, trapezoid,capitate and hamate bones.
Distal and a bit more radially to the scaphoid lies the trapezium. Between the lunate and the base of the third metacarpal bone a depression is felt in which the capitate bone is palpable. The capitate articulates with the base of the third metacarpal bone. The bone between the capitate and the trapezium is the trapezoid bone,which is more difficult to palpate.

To the ulnar side of the capitate and somewhat more distal and radial than the triquetral, the hamate bone is felt; it articulates mainly with the fourth metacarpal bone.

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