Distal Humerus - AP Projection (Partial Flexion)

Friday, May 11, 2018

Distal Humerus – AP Projection Partial Flexion

When the patient cannot completely extend the elbow, the lateral position is easily performed. However, two AP projections must be obtained to avoid distortion. A separate AP projection of the distal humerus and proximal forearm is required.

Image Receptor:

Both exposures can be made on one 8 x 10 inch crosswise by alternately covering one half of the IR with a lead mask.

Position of Patient:

Let patient seat low enough to place the entire humerus in the same plane. Support the elevated forearm.

Position of Part:

If possible, supinate the hand. Place the IR under the elbow, and center it to the condyloid area of the humerus.
Shield gonads

radiography

Central Ray:

Central ray is perpendicular to the humerus, traversing the elbow joint.
Depending on the degree of flexion, angle the central ray distally into the joint.

Structure shown:

This projection shows the distal humerus when the elbow cannot be fully extended.

radiograph

Evaluation Criteria:

The following should be clearly demonstrated:
  • Distal humerus without rotation or distortion
  • Proximal radius superimposed over the ulna.
  • Closed elbow joint
  • Greatly foreshortened proximal forearm
  • Trabecular detail on the distal humerus

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