What is the scaphoid shift test?
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).
What does Watson’s test test for?
Watson’s test is used by physicians to diagnose scapholunate instability. This test has a low specificity and sometimes is positive for capito-lunate instability. As many as 20% of normal wrists will also have a ‘clunk’.
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).
Is scaphoid hand or wrist?
The scaphoid bone is one of the carpal bones on the thumb side of the wrist, just above the radius. The bone is important for both motion and stability in the wrist joint. The word “scaphoid” comes from the Greek term for “boat.” The scaphoid bone resembles a boat with its relatively long, curved shape.
What is scaphoid tubercle?
The scaphoid tubercle is a blunt, nonarticular projection adjacent to the hollowed capitate facet on the lateral edge of the bone. The tubercle is one of four attachment points for the flexor retinaculum, a fibrous band across the wrist.
How do you perform a Watson Test?
To perform the Watson Test your patient is in sitting position with his elbow supported on the treatment bench and facing the examiner. Then fixate your patient’s radius with one hand and give pressure on the palmar prominence of the scaphoid with your thumb into dorsal direction.
Which examination is the most accurate in a suspected scaphoid fracture?
ULTRASONOGRAPHY. Ultrasound examination with routine equipment is not appropriate in the initial evaluation of suspected scaphoid fractures. High–spatial-resolution ultrasonography has been shown to be reliable and accurate in identifying occult scaphoid fractures.
What is normal scapholunate angle?
The normal scapholunate angle ranges from 30 to 60° . Subluxation of the scaphoid onto the dorsal rim of the radius can also sometimes be demonstrated on the lateral radiograph (Fig.
What is the scapholunate interval?
The scapholunate interval was measured as the distance between the scaphoid and lunate at the mid-joint space between the scaphoid and lunate. An initial inter-rater reliability assessment was completed with strong inter-rater reliability.
What is scapholunate instability?
Scapholunate dissociation is the most common form of wrist instability, defined as “the loss of synchronous motion or normal alignment between the scaphoid and the lunate”. 1. The mechanism of injury is typically a fall with the wrist extended and in ulnar deviation.
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.
Can you fracture your scaphoid without knowing?
Scaphoid fractures are quite common, but they can be difficult to detect. Unlike breaks in the long bones that connect to the wrist (such as the radius), a broken scaphoid is unlikely to display a visible, misshapen deformity in the wrist.
Which clinical exam finding has the highest specificity for identifying a scaphoid fracture of the hand?
Based on our results, among the clinical tests, which included tenderness of scaphoid tubercle, anatomical snuff box tenderness, and compression test, scaphoid tubercle tenderness was the most sensitive and specific clinical test in the diagnosis of scaphoid fractures.
How is scapholunate ligament injury diagnosed?
When it is injured, the scaphoid and lunate move apart and a gap is visible (Figure 2). An MRI is sometimes needed to confirm the diagnosis. MRI allows your surgeon to see the degree of ligament injury. Sometimes having a radiologist inject dye into the joint before the MRI helps to find a torn ligament.