Upper Extremities
18 Forearm
Anatomy
Radius, ulna, humerus, styloid processes, head of the radius, head of the ulna, radial tubercle, capitulum, trochlea, humeral epicondyles, olecranon process, ulnar notch, radial neck, radial notch, trochlear notch, coronoid process, radial fossa, coronoid fossa, olecranon fossa
Projections
[Part], PA or AP
CR Location
[Part], PA or AP –
Evaluation Criteria
Forearm – AP Evaluation Criteria: 1 ½ inches of the wrist and the elbow should be included. Humeral epicondyles visible in profile.
Forearm – Lateral Evaluation Criteria: 1 ½ inches of the wrist and the elbow should be included. Elbow flexed 90º. Humeral epicondyles directly superimposed.
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Hows & Whys of Forearm Radiography
- How can you tell that the hand was supinated on an AP image?
- The radius and ulna do not cross
- What joints should be included on forearm images?
- Wrist and elbow
- What type of joints are the distal and proximal radioulnar joints?
- Pivot
- What type of joint is the elbow?
- Hinge
- How can you tell that the hand was lateral on a lateral image?
- Radial head superimposes the coronoid process and the distal radius and ulna are superimposed
- In anatomical position, is the radius or ulna lateral?
- Radius
- What bone articulates most directly with the carpal bones at the wrist joint?
- Radius
- Which bone articulates most directly with the humerus at the elbow joint?
- Ulna
- When the arm is fully extended, what is the relation of the olecranon process to the olecranon fossa?
- The process is within the fossa