Best Imaging for Diagnosing Tennis Elbow
Tennis elbow (lateral epicondylitis) is primarily a clinical diagnosis that does not require imaging in most cases, but when imaging is needed, plain radiographs should be obtained first, followed by MRI or ultrasound for persistent or unclear cases.
Initial Imaging Approach
Radiographs as First-Line
- Plain radiographs of the elbow are the appropriate initial imaging study for evaluating lateral epicondylitis, though the diagnosis remains predominantly clinical 1, 2.
- Radiographs help exclude alternative diagnoses including fractures, heterotopic ossification, osteoarthritis, soft tissue calcification, and osteochondral lesions 1, 3.
- Comparison views with the contralateral asymptomatic elbow can be useful to identify asymmetry 1.
- Radiographs are typically normal in uncomplicated lateral epicondylitis, as this is a tendinopathy of the extensor carpi radialis brevis origin 4.
Advanced Imaging for Persistent or Unclear Cases
MRI as the Preferred Advanced Modality
- MRI is the preferred imaging modality for chronic elbow pain when radiographs are normal or nonspecific and symptoms persist despite conservative management 1, 2.
- MRI provides superior soft tissue characterization and can identify tendon pathology, associated ligamentous injuries, nerve compression (radial tunnel syndrome), and other soft tissue abnormalities 1, 2.
Ultrasound as an Alternative
- Musculoskeletal ultrasonography allows for an inexpensive dynamic evaluation of the common extensor tendon origin and can assess vascularity 2.
- Recent evidence shows that ultrasonographic measures of vascularity and superb microvascular imaging (SMI) indices do not reliably correlate with functional outcomes in lateral epicondylitis 5.
Imaging Modalities NOT Recommended
Limited or No Role
- CT imaging (with or without contrast) has no established role in the initial or routine evaluation of lateral epicondylitis 6, 1.
- Three-phase bone scan is not supported as an imaging study for tennis elbow evaluation 6, 1.
- MR arthrography and CT arthrography are reserved for suspected intra-articular pathology (loose bodies, osteochondral lesions) rather than lateral epicondylitis 1.
Clinical Diagnosis Remains Primary
Key Clinical Features
- The diagnosis is made primarily through history (repetitive wrist extension activities, occupational or athletic overuse) and physical examination findings 7, 4.
- Characteristic findings include lateral elbow pain with twisting and gripping, tenderness at the lateral epicondyle, and pain exacerbated by resisted wrist extension 7, 4.
- Weakened grip strength is a common associated finding 4.
Practical Algorithm
For typical presentation with classic examination findings: No imaging is required; proceed with conservative management 7, 4.
For atypical features, trauma history, or failed conservative treatment: Obtain plain radiographs to exclude alternative diagnoses 1, 3, 2.
For persistent symptoms after 6-12 weeks of appropriate conservative management with normal radiographs: Consider MRI to evaluate for alternative diagnoses including radial tunnel syndrome, ulnar neuropathy, or occult pathology 1, 2.