For an externally rotated AP oblique elbow projection with accurate positioning, the
1)capitulum is in profile.
2)capitulum-radial joint space is open.
3)coronoid process is in profile.
4)ulna is demonstrated without radial head superimposition.
A) 1, 2, and 4 only
B) 2, 3, and 4 only
C) 2 and 3 only
D) 1 and 4 only

Question

Quizplus · Accepted Answer

In an externally rotated AP oblique elbow projection, the capitulum (part of the humerus that articulates with the head of the radius) should be in profile, which is fulfilled in option 1. Additionally, the capitulum-radial joint space should be open, meaning that there should not be any overlapping of the joint. This is demonstrated in option 2. The ulna should be clearly visible without any overlap of the radial head, which is given in option 4. Therefore, options 1, 2, and 4 are correct, making option A the best choice. Option 3 (coronoid process in profile) is not necessary for an accurate positioning of the elbow projection.

For an Externally Rotated AP Oblique Elbow Projection with Accurate