CAMRT Radiography Practice Exam

In a shoulder arthrogram, where should the needle be inserted?

1. 1 inch above the acromion process

2. 1/2 inch superior and medial to the coracoid process

3. 1/2 inch inferior and lateral to the coracoid process

4. At the midline of the shoulder joint

The correct answer is: 1/2 inch inferior and lateral to the coracoid process

In a shoulder arthrogram, the most appropriate location for needle insertion is specifically chosen to access the glenohumeral joint effectively. The correct placement, which is 1/2 inch inferior and lateral to the coracoid process, allows the practitioner to avoid surrounding structures while providing the best access to the joint cavity. This area is typically devoid of major neurovascular bundles, reducing the risk of complications during the procedure. The coracoid process serves as a prominent anatomical landmark, and positioning the needle slightly inferior and lateral is critical for ensuring that the contrast material can be injected directly into the shoulder joint, facilitating optimal imaging results. This precise localization aids in the visualization of potential tears, joint alignment, and any abnormalities that may be present within the glenohumeral joint. Other locations such as above the acromion process or at the midline may not effectively enter the joint space and could risk injuring surrounding tissues or missing the target area entirely. Additionally, superior and medial to the coracoid may not provide the advantageous direct entry required for thorough assessment. Therefore, the chosen insertion site helps achieve the goal of the arthrogram efficiently and safely.