Wrist Flashcards
Name all carpal bones, starting with proximal row, most lateral
Proximal: Scaphoid/navicular, lunate, triquetrum, pisiform
Distal row: Trapezium, trapezoid, capitate, hamate
What is the most commonly fractured carpal bone?
Scaphoid
What is the anatomic area located between the 2 major tendons of the thumb? How is this related to wrist imaging?
Snuffbox, it is right where the scaphoid is, indicator of fracture if patient complains of pain there
Which carpal bone articulates with the base of the 1st MC?
Trapezium
Which carpal bone articulates with the base of the 2nd MC?
Trapezoid
Which carpal bone articulates with the base of the 3rd MC?
Capitate
Which carpal bone articulates with the base of the 4th & 5th MC?
Hamate
Which 2 carpal bones articulate with the distal radius?
Scaphoid, and lunate
For PA wrist, how should the fingers be positioned for this image? Why?
Curl fingers under palm, it extends the wrist out and having the fingers extended can close joint spaces, also cause OID
For PA wrist, how can you determine that the fingers were not properly positioned?
Joint spaces are closed, distortion of scaphoid bone and foreshortening
For PA, what is the CR location?
Mid carpals
For PA, how much of the distal radius and ulna should be demonstrated?
2.5” of distal radius and ulna
For PA, if properly positioned, which joint/articulation should be demonstrated as open?
Carpal metacarpal joints open
For PA, if properly positioned, how should the trapezoid be demonstrated with relation to the trapezium?
Trapezoid partially superimposed over trapezium
For PA oblique, what is the position for this image?
Lateral rotation
For PA oblique, how much should the part be rotated?
45 degrees
For PA oblique, what is the CR location?
Mid carpal
For PA oblique, what carpal bone is seen without superimposition when the part is properly positioned?
The trapezoid and trapezium will be seen without superimposition
For PA oblique, which parts of the scaphoid/navicular carpal bone will be demonstrated in profile in a properly positioned PA oblique wrist?
The tuberosity waist will be in profile
For lateral, what projection is performed?
Lateromedial
For lateral, how should the distal radius & ulna be positioned in a lateral wrist?
Radius superimposed over ulna
For lateral, what is the CR location?
Wrist joint, where radius meets carpal bones proximal
For lateral, how should the metacarpal bases be demonstrated in a properly positioned lateral wrist?
Should be superimposed 2nd-5th
For lateral, when evaluating your lateral wrist, you notice that the radius is anterior to the ulna. What error occurred?
Anterior rotation
For lateral, when evaluating your lateral wrist, you notice that the ulna is anterior to the radius and the pisiform carpal bone is visible anteriorly. What error occurred?
Posterior rotation
For AP oblique, what is the position for this image?
Medial rotation
For AP, how much is the part obliqued?
45 degrees
For AP, what carpal bone will be best demonstrated in this image? HOW will it be seen?
Medial carpal bones, mainly pisiform, withouth superimposition, in profile with hamate
For AP, what is the CR location?
Mid carpals
Besides the carpal bone, what other carpal structure will be best demonstrated on this image, AP oblique?
Hamate hook
Which way is the hand deviated for PA ulnar deviation?
Towards ulna
What will be best demonstrated in a PA ulnar deviation?
Scaphoid, opens joint spaces between adjacent carpals
CR location for PA ulnar deviation?
Scaphoid
For PA radial deviation, which way is the hand deviated?
Towards radius
For PA radial deviation, what will be best demonstrated?
Open interspaces between carpals on the medial side of wrist, scaphoid
For PA axial projection, what 2 ways can this projection be performed? Describe each.
Fingers fully extended, tube angled at 20 degrees towards the elbow, or angle part at 20 degrees
For PA axial, what is the method name?
Stetcher method
For PA axial, what is the CR/ part angle?
20 degrees
For PA axial, what is the CR location?
Scaphoid
For PA axial, which carpal bone is best demonstrated? How should the bone be seen?
Scaphoid, without superimposition
What does tangenital mean?
Diverging, hardly touching
What is the method name for tangential wrist?
Gaynor hart method
What is best demonstrated in this image for tangential wrist?
Carpal canal, pisiform without superimposition, hamate hook
How is the hand/wrist positioned for this image for tangential wrist?
Hand is perpendicular to IR
What is the CR location for tangential wrist?
1” distal to base of 3rd metacarpal, middle of palm
What is the CR angle/direction for tangential wrist?
25-30 degrees to long axis of hand
Which carpal bones are of interest for tangential?
pisiform without superimposition, hamate hook, and trapezium
