In an active patient who injured the biceps brachii during a swinging motion while playing pickleball and now has pain, swelling, and bruising, if the initial magnetic resonance imaging (MRI) is negative, should a dedicated magnetic resonance imaging (MRI) of the biceps muscle be obtained?

No, a repeat or "dedicated" MRI of the biceps muscle is not recommended if the initial MRI is negative

If the initial MRI is negative in this clinical scenario, the next step should be ultrasound evaluation of the distal biceps tendon, not another MRI. 1

Clinical Reasoning

Why Not Repeat MRI?

The evidence does not support obtaining a "dedicated MRI of the biceps muscle" after a negative initial MRI. The 2024 ACR Appropriateness Criteria for acute elbow and forearm pain provides clear guidance on imaging modalities for biceps injuries but does not recommend repeat or specialized MRI imaging when initial studies are negative 1.

The Role of Standard MRI

MRI is already the most accurate imaging modality for identifying distal biceps tendon tears, with:

• Sensitivity of 76% and specificity of 50% for detecting biceps tendon tears
• Accuracy of 86.4% for complete ruptures 1, 2

The evidence shows that MRI correctly identifies the type of distal biceps tendon tear better than other modalities, enabling more precise treatment planning 1. If a standard MRI protocol was performed and is negative, the pathology is either:

1. Not present
2. Too subtle to be clinically significant
3. Better evaluated by a different modality

When FABS View May Help

The flexion-abduction-supination (FABS) view is a specialized MRI sequence that can be added to standard MRI protocols, but its utility is limited:

• It may help in challenging cases distinguishing high-grade partial versus complete tears by identifying subtle residual tendon fibers 1
• However, it does not significantly change diagnostic accuracy in most cases 1
• It should be considered during the initial MRI if there is high clinical suspicion, not as a separate "dedicated" study afterward

Ultrasound as the Next Step

If clinical suspicion remains high despite negative MRI, ultrasound should be the next imaging modality 1:

• Ultrasound can be considered an alternative to MRI for evaluating distal biceps tendon ruptures 1
• Supplementary sonographic views (posterior Cobra technique, lateral supinator view, medial pronator view) add diagnostic value 1
• US has the advantage of dynamic evaluation and can assess the tendon during movement
• While US has lower overall accuracy than MRI for complete tears (45.5% vs 86.4%), it performs equally well for partial tears (66.7%) 1, 2

Common Pitfalls to Avoid

1. Ordering redundant imaging: A "dedicated MRI of the biceps muscle" after a negative standard MRI adds radiation exposure, cost, and delay without evidence of benefit
2. Ignoring clinical examination: If MRI is negative but clinical suspicion remains very high (palpable defect, positive hook test, significant weakness), proceed directly to orthopedic consultation rather than more imaging
3. Missing the bicipital tunnel: Standard MRI may miss extra-articular bicipital tunnel pathology (scar/stenosis, loose bodies), which requires specific attention during interpretation 3

Recommended Algorithm

For an active patient with acute biceps injury and negative initial MRI:

1. Review the initial MRI to ensure it included appropriate sequences for biceps evaluation
2. If clinical suspicion remains high: Order targeted ultrasound with supplementary views (not repeat MRI)
3. If ultrasound is also negative but symptoms persist: Refer to orthopedic surgery for clinical evaluation and consideration of diagnostic arthroscopy if indicated
4. If both imaging modalities are negative and clinical examination is not compelling: Consider alternative diagnoses (muscle strain, contusion, referred pain)

The evidence clearly supports ultrasound as the complementary modality to MRI, not repeat MRI imaging 1.