Recommended Radiographic Views for Elbow Injury
For initial evaluation of acute elbow injury, obtain standard anteroposterior (AP) and lateral radiographs of the elbow as the first-line imaging study 1.
Initial Imaging Approach
Conventional radiographs are the appropriate initial imaging modality for acute elbow trauma and should be obtained before considering any advanced imaging 1. The 2024 ACR Appropriateness Criteria explicitly states that radiographs are beneficial as the initial imaging assessment for acute elbow and proximal forearm pain, primarily to exclude fracture or dislocation 1.
Standard Views Include:
- Anteroposterior (AP) view: Essential baseline projection
- Lateral view: Critical for identifying joint effusions and displacement
- Oblique views: Add these when evaluating the radial head or coronoid process specifically 2
Key Radiographic Findings to Assess
When reviewing elbow radiographs, specifically look for:
- Fat pad elevation (posterior and anterior): In the context of acute trauma, this implies an occult elbow fracture even when no fracture line is visible 1
- Radial head/neck fractures: Account for 50% of adult elbow fractures 1
- Avulsion fractures at tendon and ligament attachment sites
- Coronoid process fractures: These should prompt assessment for associated ligamentous injuries, as they typically occur with elbow dislocation 1
When Initial Radiographs Are Normal or Indeterminate
If Fracture Still Suspected (Osseous Injury):
Proceed to CT without IV contrast 1. Studies demonstrate that CT identifies occult fractures in 12.8% of patients with negative or equivocal radiographs when clinical suspicion remains high 1. CT provides superior detail regarding:
- Fracture fragment size and displacement
- Angulation that affects surgical planning
- Occult fractures of the radial head, olecranon, and coronoid process 1
If Soft Tissue Injury Suspected (Tendon/Ligament/Muscle):
Obtain MRI without IV contrast 1. MRI demonstrates 87.5% concordance with surgical findings for medial collateral ligament injuries and 90.9% for lateral collateral ligament injuries 1. MRI is particularly valuable for:
- Collateral ligament complex injuries
- Biceps and triceps tendon tears (improved sensitivity for partial tears) 1
- Post-dislocation soft tissue assessment 1
Common Pitfalls to Avoid
- Do not obtain CT, MRI, ultrasound, or bone scan as initial imaging - there is no evidence supporting these as first-line studies 1
- Do not dismiss a joint effusion on lateral radiographs - fat pad elevation with acute trauma history strongly suggests occult fracture even without visible fracture line 1
- Do not overlook coronoid fractures - these mandate evaluation for associated soft tissue injuries as they rarely occur in isolation 1
- Do not use contrast-enhanced imaging for either CT or MRI in acute elbow trauma - noncontrast studies provide all necessary information 1
Clinical Decision Algorithm
- Acute elbow injury → Standard AP and lateral radiographs
- Radiographs show fracture/dislocation → Proceed with appropriate treatment
- Radiographs normal BUT clinical suspicion for fracture remains → CT without contrast
- Radiographs normal BUT clinical suspicion for ligament/tendon injury → MRI without contrast
- Radiographs show fat pad sign with trauma history → Treat as occult fracture or obtain CT for confirmation
The evidence strongly supports this algorithmic approach, with radiography remaining the bedrock of initial assessment despite advances in cross-sectional imaging 1, 3, 4.