What is scaphoid tubercle?
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.
What are the views for scaphoid?
The initial radiographic assessment of scaphoid fractures is performed with plain radiography. Standard views vary among institutions, but most use a minimum of 3 views: PA, true lateral, and semipronated oblique with, in many instances, ulnar deviation.
Which projection of the wrist elongates the scaphoid and shortens the capitate?
The central beam is angled 25 to 30° toward the elbow and is centered just distal to Lister’s tubercle. 12 (B) This view elongates the scaphoid and short- ens the capitate. The radiocarpal (R-C) joint should demonstrate minimum bony overlap with parallelism at the (R-C) joint still vis- ible.
What are the 3 zones of the scaphoid?
The scaphoid can be morphologically divided into three anatomic regions: proximal third (proximal pole), central third (waist), and distal third (distal pole).
What is Lister’s tubercle?
Lister’s tubercle or the dorsal tubercle of the radius is a bony protuberance on the dorsal surface of the distal radius. It separates the 2nd (ECRB and ECRL) and 3rd (EPL) extensor compartments. It acts as a pulley for the EPL tendon, changing its mechanical direction of action.
How do you do the scaphoid picture?
Plain radiography remains the initial imaging modality to assess scaphoid fractures. Magnetic resonance imaging (MRI) is excellent in the detection of clinically suspected, but initially radiographically negative, scaphoid fractures.
What is the reference point of the central ray for PA projection of the scaphoid?
Central ray: The central ray should be perpendicular to the image receptor and centered to the scaphoid. 10 to 15 degrees angulation distally may provide clear delineation sometimes.
Which projection is done to demonstrate the scaphoid?
The scaphoid series is comprised of a posteroanterior, oblique, lateral and angled posteroanterior projection. The series examines the carpal bones focused mainly on the scaphoid. It also examines the radiocarpal and distal radiocarpal joint along with the distal radius and ulna.
Which of the following criteria is are required for visualization of the greater tubercle in profile?
Which of the following criteria is (are) required for visualization of the greater tubercle in profile? The greater and lesser tubercles are prominences on the proximal humerus separated by the intertubercular (bicipital) groove.
What special test will you perform to confirm if patient has scaphoid fracture?
There are several different diagnostic modalities to detect a scaphoid fracture. These include conventional radiographs, computed tomography (CT scans), magnetic resonance examination, bone scintigraphy and sonograms.
Which part of the scaphoid is avascular necrosis?
Avascular necrosis (AVN) is one complication of scaphoid fracture. Since the scaphoid receives its arterial supply in a retrograde fashion (i.e. from distal to proximal pole), the part proximal to the fracture is usually affected.