Shoulder girdle radiography: Rad Tech
Shoulder girdle radiography helps evaluate shoulder pain, limited range of motion, instability, suspected fracture or dislocation, degenerative joint disease, and soft tissue calcifications.
The shoulder girdle includes two bones, the clavicle and the scapula. Together these bones help connect the upper limb to the trunk.
The shoulder girdle is incomplete posteriorly because the scapulae are widely separated across the back, and it's completed anteriorly by the sternum, where each clavicle articulates medially at the sternoclavicular joint.
Although the proximal humerus is part of the upper limb rather than the shoulder girdle, it's included in shoulder imaging because the humeral head articulates with the glenoid cavity of the scapula at the shoulder joint.
As a radiologic technologist, understanding this anatomy is essential for accurate patient positioning, ensuring the resulting image clearly demonstrates the anatomy of interest.
Standard shoulder girdle imaging may include projections of the shoulder and proximal humerus, acromioclavicular or AC joints, the sternoclavicular or SC joints, clavicle, and scapula.
The exact series depends on the clinical question and department protocol. A routine shoulder series commonly includes anteroposterior or AP views in external rotation and internal rotation.
The AP oblique grashy method is used to visualize the glenohumeral joint space and profile the glenoid cavity. The Apple method modifies the grashy position with weighted abduction to load the glenohumeral joint and help demonstrate cartilage loss or joint space narrowing.
For a pain limited or trauma adjacent shoulder, don't force any rotation or abduction. Options may include AP neutral, scapular Y, or transthoracic lateral Lawrence method to assess the proximal humerus and glenohumeral relationship.
The near tangential outlet projection helps evaluate the supraspinatus outlet, subacromial space, and suspected impingement.
Clavicle radiography typically uses AP and AP axial projections. AC joint imaging is usually bilateral AP with and without weights when ordered to compare joint spaces.
Scapula imaging can include AP and lateral projections for specific anatomy or clinical questions. Radiologic technologists utilize the reason for the exam, such as pain, limited range of motion, suspected fracture, or dislocation to adapt patient positioning and technique according to established protocols.
Understanding the clinical question ensures that despite limitation in patient mobility or cooperation, the final images accurately demonstrate the joint space, alignment, and the anatomy of interest.
For patient positioning, upright positioning is preferred when the patient can safely stand or sit, because it can show natural shoulder alignment.
This places the medial and lateral epicondyles at the elbow parallel to the image receptor, which externally rotates the humerus and brings the greater tubercle into lateral profile.
For internal rotation, the back of the hand rests on the hip, and the epicondyles are perpendicular to the receptor. For pain limited exams and potential dislocation, use neutral rotation.
The patient keeps the arm relaxed with the palm against the thigh. This avoids rotating a painful or potentially injured shoulder and places the humerus in a partially rotated position with the greater tubercle partially superimposed on the humeral head.
When using the Grashy method, the patient's body is rotated about 35 to 45 degrees toward the side of interest, so the scapula is parallel to the image receptor, opening the glenohumeral joint space.
For suspected fracture or dislocation, avoid rotating, abducting, or manipulating the arm beyond what the patient can tolerate.
When obtaining lateral information using a transthoracic lateral Lawrence method, the side of interest is placed against the image receptor, and the opposite arm is raised if possible.
The central ray is centered to the surgical neck of the humerus, which is the narrow area just below the tubercles near the top of the humerus and is a common site for fracture.
This helps demonstrate the proximal humerus through the thorax while avoiding movement of the injured shoulder. For the near method, the patient is usually upright in an anterior oblique position with the side of interest closest to the receptor, and the body is rotated until the scapular body is approximately perpendicular to the image receptor.
Center and angle the beam according to department protocol, then ask the patient to suspend respiration. Throughout positioning, communicate before touching or moving the patient.
Support the arm if needed, and stop if the movement increases pain or feels unsafe. These small steps minimize the risk of injury, build patient trust, reduce motion, and help prevent repeat imaging.
Image evaluation begins with the correct side marker, complete anatomy, appropriate collimation of the X-ray beam, and sharp bony margins without motion blur.
Asking the patient to suspend respiration during the exposure helps reduce motion for most shoulder projections. Evaluation is projection specific.
A grashy view should open the glenohumeral joint space and profile the glenoid. A scapular Y view should show the acromion and coracoid forming a Y around the glenoid.
Common errors include a closed glenohumeral joint space on a grashy view because of under or over rotation, clipped anatomy, marker placement over anatomy, motion blur, or poor penetration through the shoulder.
If a fracture, dislocation, or severe pain is suspected, don't rotate or abduct the arm unless the provider and department protocol indicate it's safe.
Position the patient upright, seated, supine, or recumbent based on stability and tolerance. Use modified or alternative projections to answer the clinical question while keeping the shoulder as still and supported as possible.
For children, use developmentally appropriate explanations, immobilization aids when needed, and caregiver assistance only when it's safe and allowed by department policy.
Caregivers who assist should remain outside the primary beam whenever possible and use protective apparel as needed. For older adults, allow extra time, support painful or arthritic joints, reduce fall risk, and modify positions for kyphosis, limited mobility, or osteopenia.
For patients with a larger body habitus, the radiologic technologist may need to modify the setup while keeping the imaging goal the same.
Instead of relying only on visual landmarks, use palpation when appropriate to locate key anatomy. Then adjust the image receptor so the area of interest is fully included.
Center the central ray to the correct landmark and columnate closely to the anatomy being imaged. Technical factors may also need to be adjusted according to department protocol to account for tissue thickness and maintain image quality.
Upright positioning may be preferred when it improves patient comfort, reduces motion, or helps place the shoulder girdle closer to the image receptor.
All right, as a quick recap, shoulder girdle imaging focuses on the clavicle and scapula, along with the shoulder complex articulations involving the humeral head, glenoid cavity, AC joint, and SC joint.
Position choice is guided by the clinical purpose such as pain, instability, limited range of motion, suspected fracture or dislocation, or degenerative changes.
For accurate images, the radiologic technologist centers to the anatomy of interest, controls rotation and arm position, opens joint spaces when possible, minimizes overlap, and adapts positioning to patient tolerance.
Safety comes from clear communication, stabilization, collimation, appropriate exposure, and marker placement. These principles help the care team obtain diagnostic images while keeping the patient as comfortable and safe as possible.
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