Which imaging modality is commonly used to assess the suspensory ligament and distal sesamoidean ligaments, and what findings indicate injury?

Which imaging modality is commonly used to assess the suspensory ligament and distal sesamoidean ligaments, and what findings indicate injury?

• A. Radiographs showing bone remodeling.
• B. Magnetic resonance imaging showing soft tissue edema only.
• C. Ultrasonography showing fiber disruption, swelling, hypoechoic or heterogeneous areas, and core lesions.
• D. Computed tomography showing cortical defects only.

Answer: (C)

When assessing the suspensory ligament and distal sesamoidean ligaments, ultrasound is the most informative tool because these structures are superficial and their fibrous tissue responds well to high-frequency sound waves. In a healthy ligament, the fibers appear as bright, parallel lines with a uniform echotexture. Injury disrupts this architecture: you’ll see breaks or gaps in the fiber pattern, new swelling around the ligament, and areas within the ligament that are darker (hypoechoic) or mixed (heterogeneous), reflecting edema, fiber tearing, or tissue disruption. A focal deep defect, sometimes called a core lesion, can indicate a more significant injury. Doppler may show increased blood flow in acute cases, supporting active inflammation.

Other imaging options aren’t as directly informative for these ligaments. Radiographs mainly reveal bone changes that may occur secondarily; MRI can show soft-tissue edema but may not always delineate the fiber disruption as clearly or as practically as ultrasound; CT highlights bone structures rather than the ligament fibers.