What is the scapholunate interval?
The scapholunate interval or gap is the radiographic measurement of the scapholunate joint and widening is indicative of a scapholunate ligament injury.
What is the normal scapholunate angle?
30 to 60°
The normal scapholunate angle ranges from 30 to 60° [7]. Subluxation of the scaphoid onto the dorsal rim of the radius can also sometimes be demonstrated on the lateral radiograph (Fig.
How do you measure a scapholunate angle?
Since the sum of the angles in a triangle is 180°, the Cobb’s angle is calculated by subtraction of the sum of the angles from 180° (Cobb’s angle = 180 − A − B). Scapholunate angle is calculated by summing the angle measurements (scapholunate angle = 180 − (180 − A − B) = A + B; Fig. 4).
What is scapholunate?
The scapholunate joint is a small joint between two carpal bones at the wrist crease, namely the scaphoid and lunate bones. The scapholunate joint is very important for the stability of the wrist joint. It is often injured during sport, for example, if you fall heavily onto your hand.
What is scapholunate widening?
It results from the relative instability between the scaphoid and lunate bones secondary to the injury of scapholunate ligament and generally presents radiographically as a widened medial-lateral gap between the two carpal bones.
How do you assess scapholunate ligament?
The scaphoid shift test is a provocative maneuver used to examine the dynamic stability of the scaphoid and reproduce a patient’s symptoms. It is used to diagnose scapholunate interosseous ligament instability (SLIL).
Is SLAC wrist painful?
WHAT SLAC WRIST ARTHRITIS? SLAC stands for “scapho-lunate advanced collapse”. It is a painful condition of the wrist.
What is scapholunate instability?
The terms “scapholunate (SL) dissociation” and “SL instability” refer to one of the most frequent types of wrist instability, resulting from rupture or attenuation of the SL supporting ligaments. From a radiologic point of view, SL instability may be dynamic or static.
What causes scapholunate widening?
Scapholunate dissociation most commonly results from trauma. It is the leading cause of SLAC (scapholunate advanced collapse) wrist, which is the most common pattern of degenerative arthritis in the wrist 4.
What is a full thickness tear of the scapholunate ligament?
In a scapholunate advanced collapse (SLAC) injury, the ligament is completely torn, and the injury has been there a long time (years) causing arthritis, or evidence of cartilage damage, to be seen on regular x-rays in addition to the gapping between the scaphoid and the lunate.
What is Stage 3 SLAC wrist?
Stage III SLAC wrist. PA radiograph shows sclerosis and joint space narrowing between the lunate and capitate, and the capitate will eventually migrate proximally into the space created by the scapholunate dissociation.
How far is it from Connecticut to Virginia?
Distance from Connecticut to Virginia. Distance from Connecticut to Virginia is 666 kilometers.
What is normal scapholunate dissociation?
In adults, the normal value is usually taken as <2 mm, with an interval of >3 mm (see: Terry Thomas sign) generally considered diagnostic of scapholunate dissociation 1-3. In children, the scapholunate interval is normally wider due to the large chondral component to the carpus.
How do you measure the scapholunate interval?
The scapholunate interval should be measured between the midportion of the scaphoid and lunate on neutral PA, Moneim, PA ulnar deviation or clenched fist projections 4,5 . Abnormal widening is indicative of injury to the scapholunate ligament that occurs with scapholunate dissociation .
What is the scapholunate gap?
The scapholunate interval or gap is the radiographic measurement of the scapholunate joint and widening is indicative of a scapholunate ligament injury. The scapholunate interval should be measured between the midportion of the scaphoid and lunate on neutral PA, Moneim, PA ulnar deviation or clenched fist projections 4,5 .