Wednesday 25 April 2012

Elbow

Lateral

Indications for imaging
Trauma, loose bodies, bone pain,
Anatomy  Demonstrated

Anatomy of the Lt Elbow lat
Meschan, I. 1955 An Atlas of Normal Radiographic Anatomy Saunders, London

Basic Patient Position
The patient sits alongside the end of the table with the affected elbow flexed at 90 degrees and the hand rotated externally into the true lateral position, the table top should be raised to the level of the lower border of the axilla so the whole arm is supported and parallel to the cassette. The hand may need to be supported on a small pad to bring to superimpose the humeral epicondyles.

 
Right Elbow Lateral  Patient Position
Meschan, I. 1955 An Atlas of Normal Radiographic Anatomy Saunders, London
Radiation protection
Direct lead rubber gonad protection using a "half apron".
Ensure the lower limbs and torso are not below the table top in the primary beam.
Central Ray
The vertical central ray is directed to the joint space immediately distal to the palpable lateral humeral epicondyle, (note this is lateral to the point midway between the skin surfaces).
Exposure Factors
Kv mAS FFD (cm) Grid Focus AEC Cassette
70 6 100 No Fine No 24 x 30 cm
Evaluation of the Image
ID and markers must be present and correct in the appropriate area of the film
Limits of the examination, superiorly distal 10 cm humerus, inferiorly proximal 10 cm forearm, medially and laterally the skin surfaces.
Evidence of collimation on four sides equally around the centering point
The humeral epicondyles are superimposed and the joint space visible.
The radial head surface should be lateral with approximately half of the radial head superimposed on the ulnar.
The exposure should penetrate and demonstrate the bone trabecular pattern of the superimposed humeral epicondyles, the soft tissues must be demonstrated in order to demonstrate the fat pads.
Elbow Rt Lateral
Related Projections
Elbow AP
Elbow Head of Radius
Elbow Axial
Additional modalities
MRI for joint and soft tissue structures

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