What is capitate subluxation?

Capitate subluxation is most commonly associated with instability at the scapholunate articulation (see scaphoid shift test, p. 119), usually resulting from a fall on an outstretched hand.

What is the function of the capitate joint?

The primary role of the radiocarpal joint is to allow movement of the hand upwards (extension) and downwards (flexion). This is stabilised by the radioulnar ligaments which connect the radius and ulna forearm bones anteriorly and posteriorly.

What does the capitate bone articulate with?

The capitate is the largest of the carpal bones. It lies between the trapezoid and hamate, which are also carpal bones. It articulates with the third metacarpal, and a small angle helps it to also junction with the fourth metacarpal. It is convex to work with the scaphoid and lunate, which have concave surfaces.

What causes capitate subluxation in a hand?

Capitate subluxation is most commonly associated with instability at the scapholunate articulation (see scaphoid shift test, p. 119), usually resulting from a fall on an outstretched hand.

What should I do if my capitate has subluxed?

2) Manual therapy If the capitate has subluxed then it should first be reduced (put back in place) by a qualified orthopaedic physiotherapist. They will flex the wrist to relax the ligaments and apply a sudden downward thrust whilst applying traction to gap the space.

When does the capitate dislocate in the wrist?

Perilunate dislocation occurs when the capitate bone and the distal wrist and hand dislocate as a unit, usually in a dorsal direction. The capitate, which normally rests in the concavity of the distal lunate, “hops” out of the cup. The lunate retains its upright teacup appearance relative to the distal radius.

When is the capitate centered over the distal radius?

If the capitate is centered over the radius and the lunate is tilted out, it is a lunate dislocation. If however the lunate centers over the distal radius and the capitate is dorsal, we are dealing with a perilunate dislocation (figure).