Plain film radiographs offer an adequate cursory evaluation of carpal instability. • Ensure proper positioning (PA and lateral projections). • Assessment of joint. Instr Course Lect. ; Carpal instability. Cassidy C(1), Ruby LK. Author information: (1)New England Medical Center, Boston, Massachusetts, USA. Instability in the ulnar carpal wrist may present with pain, swelling, and tenderness in the ulnar aspect of the wrist. Instability due to weakened.


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Carpal instability

Abstract Fractures of the bones that make the wrist joint together with injury to the ligaments and joint capsules are frequent traumas. It can cause besides limited movement also the pathological mobility. These mild injuries often do not provide the degree of recognizable symptoms and signs.

They are diagnosed by X-ray imaging, stress images. Carpal instability arthrography was an important method, but nowadays arthroscopy carpal instability the advantage.

Fresh bone and ligament injuries can be and should be repaired in the early posttraumatic period.

Wrist Instability After Injury

Unrecognized and undiagnosed injuries are leading to instability carpal instability the wrist, to motion abnormalities or impingement overload syndrome. In the treatment of instability important place have carpal instability of the ligaments carpal instability arthrodesis of the wrist.

They first wrote about the connection between the proximal and distal row of carpal bones and pointed to consequential instability of the system under the influence of compressive forces. Later, Fisk in stressed relationship between the carpal instability and scaphoid bone fracture.

CIND (carpal instability nondissociative) - Hand - Orthobullets

Linsheid and associates and Dobyns et al have written important articles which have defined the instability of the wrist, described the X-ray findings, and offer the draft classification and the first carpal instability approach.

Since then, things have become more complicated, mainly because lack of consensual terminology. The International Wrist Investigators Workshop Nomenclature Committee was established to carpal instability the terms used to describe carpal instability, but so far no single system is not harmonized.

Larson and colleagues in made system with six categories, based on chronicity, constancy, etiology, location, direction and mechanism of instability, with the carpal instability to standardize the diagnosis, treatment and uniformity in publishing results 1. Proximal row is made of scaphoid, lunate and triquetrum bone.

The distal row consists trapezium, trapezoid, carpal instability and hamate bone, and forms a stable surface on which rely metacarpal bones.

Wrist Instability After Injury

Movement between the bones of the distal row is very limited. Scaphoid bone is movable connection between the proximal and distal carpal bones rows.

When the movement of the wrist from ulnar to radial carpal instability, the scaphoid bone is moved in volar direction, to avoid the radius styloid process this movement is used when performing Carpal instability test.

Talesnikov modification of the Navaro concept of the wrist with longitudinal columns is another way to analyze the same concept.

Carpal instability.

This leads to the conclusion that the lunate is displaced while the other bones have stayed together. Carpal arcs PA radiograph of the wrist.

The three normal carpal carpal instability The next step is looking at the three carpal arcs: The first arc is a smooth curve outlining the proximal convexities of the scaphoid, lunate and triquetrum. The second arc traces the carpal instability concave surfaces of the same bones, and the third arc follows the main proximal curvatures of the capitate and hamate.

PA radiograph of the wrist and schematic representation showing disruption of the first carpal arc Distruption of carpal arcs An arc is disrupted if it cannot be traced smoothly.


A break in one of the arcs indicates a fracture or the disruption of a ligament leading to a subluxation or dislocation. On the left one can note the disruption of arc I at the lunotriquetral joint. Disruption of the second carpal arc A disruption of the second carpal arc at the scapholunate joint and carpal instability lunotriquetral carpal instability is seen on the left.

Although there is carpal instability gap in the first arc, it can still be traced by a smooth curve so arc I is considered intact.

Disruption of the carpal instability carpal arc at carpal instability capitohamate joint Disruption of the third carpal arc is shown in the next case on the left.

There is an abnormal step off at the capitohamate joint.


Shape of carpal bones Schematic representation of the lunate shape in carpal instability positions Lunate shape The lunate has a trapezoidal shape, carpal instability the sides converge from the proximal surface to the distal surface, which are grossly parallel.