Standard Elbow X-Ray Series: Three Views
For elbow radiography, you should order a standard three-view series consisting of anteroposterior (AP), lateral, and oblique (radiocapitellar) views 1.
Rationale for Three-View Protocol
The 2024 ACR Appropriateness Criteria explicitly recommends conventional radiographs as the initial imaging modality for acute elbow and forearm pain, emphasizing that radiographs are beneficial for excluding fractures or dislocations 1. While the guidelines don't specify the exact number of views in a single statement, the standard practice referenced throughout involves multiple projections to adequately visualize all anatomical structures.
Why Multiple Views Are Essential
- Radial head fractures (the most common elbow fracture in adults, accounting for 50% of cases) can be occult on single views 1
- Fat pad signs indicating joint effusion and occult fractures require proper lateral positioning to visualize 1
- Coronoid process fractures and other subtle injuries may only be visible on specific projections 1
Clinical Evidence Supporting Multiple Views
Research demonstrates that occult fractures are frequently missed when inadequate views are obtained. A study specifically evaluating the sitting axial mediolateral projection (TEMIS view) found that 2 out of 14 radial head fractures were only visible on this additional view and were completely missed by standard AP and lateral projections alone 2. This underscores that even with two views, fractures can remain undetected.
Quality Over Quantity
The diagnostic utility of elbow radiographs depends heavily on proper positioning. Studies show that only 24% of lateral elbow radiographs in injured children meet optimal quality standards, with 63% being merely adequate and 13% suboptimal 3. Poor quality imaging significantly limits diagnostic capability, particularly for subtle fractures.
Common Pitfalls to Avoid
- Accepting inadequate lateral views: The lateral projection is particularly prone to poor positioning. Look for the hourglass sign appearing in the anterior third of the humerus and a lateral distal humeral metaphyseal-diaphyseal ratio of approximately 1.0 to confirm true lateral positioning 3
- Missing fat pad signs: These require a properly positioned lateral view and indicate joint effusion, which in the context of acute trauma implies an occult fracture even when no fracture line is visible 1
- Failing to assess alignment: Multiple radiographic lines (radiocapitellar line in both AP and lateral projections, anterior humeral line) must be evaluated across different views to detect subtle dislocations or alignment abnormalities 1
When Three Views May Be Insufficient
If clinical suspicion remains high despite normal or indeterminate radiographs, CT without contrast is the next appropriate imaging study for suspected fractures 1. Studies show that CT identifies occult fractures in 12.8% of patients with equivocal radiographs and positive clinical findings 1.
For suspected soft tissue injuries (tendon, ligament, or muscle), MRI without contrast becomes the appropriate next step when radiographs are normal or indeterminate 1.