How is scapholunate gap measured?
Measurement. 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.
What is the normal scapholunate angle?
between 30 and 60o
The scapholunate angle is the angle between the long axis of the scaphoid and the mid axis of the lunate on sagittal imaging of the wrist. In a normal situation, it should be between 30 and 60o in the resting (neutral) position.
How do you measure a Capitolunate angle?
The capitolunate angle is the angle between the long axis of the capitate and the mid axis of the lunate on the sagittal imaging of the wrist. In a normal situation it should be less than 30° in the resting (neutral) position.
How is scapholunate dissociation diagnosed?
Imaging tests such as X-ray, MRI or CT-scan may be ordered. Diagnosis is confirmed through evidence of the following: Instability of the ligaments supporting the scaphoid and lunate bones. Widening of the joint space between the bones.
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)
What is SLAC wrist?
Scapholunate advanced collapse (SLAC) is a characteristic degenerative clinical wrist condition of progressive deformity, instability, and arthritis that affects the radiocarpal and mid-carpal joints of the wrist.
Is SLAC wrist painful?
WHAT SLAC WRIST ARTHRITIS? SLAC stands for “scapho-lunate advanced collapse”. It is a painful condition of the wrist. The scaphoid and lunate are two small bones in the wrist held tightly together by a band of tissue called the scapholunate ligament.
How common is SLAC wrist?
There are three different patterns of arthropathy seen about the wrist which include SLAC, triscaphe arthritis (between the trapezium, trapezoid and distal scaphoid) and a combination pattern. SLAC wrist is the most common type of wrist arthritis and accounts for approximately 55 % of all wrist arthritis [14].
What is a DISI wrist?
Dorsal intercalated segment instability (DISI) is a deformity of the wrist where the lunate angulates to the posterior side of the hand.
What are the 3 zones of the scaphoid?
Methods. We measured the coronal and sagittal dimensions of the scaphoid in 3 zones: proximal, waist, and distal, in CT scans of wrists with intact scaphoids obtained from 50 live subjects.
What is four corner fusion in the wrist?
Four-corner fusion is a partial fusion technique used in some patients with advanced degenerative change in the wrist. Partial fusion reduces pain from the joint while still preserving some motion (as opposed to a total wrist fusion).
In a normal situation it should be between 30o and 60o in the resting (neutral) position. The scapholunate angle is abnormal in carpal instability: increased in scapholunate dissociation.
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 does abnormal scapholunate interval mean?
The scapholunate interval is the radiographic measurement of the scapholunate joint on PA wrist projections. 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 .