Which imaging technique is considered the gold standard for diagnosing tarsal coalition?

Computed Tomography (CT) is recognized as the gold standard for diagnosing tarsal coalition due to its ability to provide detailed cross-sectional images of bony structures. Tarsal coalition involves an abnormal connection between two or more tarsal bones in the foot, often leading to pain and functional limitations.

CT scans excel at visualizing osseous details and can effectively reveal both congenital and acquired tarsal coalitions, allowing for clear identification of the coalition's presence, type, and morphology. This level of detail is often superior to other imaging modalities, particularly in terms of assessing the bony anatomy and potential abnormalities associated with the coalition.

While X-rays may show indirect signs of a coalition and MRI can provide insights into soft tissue and cartilage involvement, they do not offer the same resolution for bony structures. Ultrasound, on the other hand, is limited in its ability to assess deep structures of the foot and is not typically used for this specific diagnosis. Therefore, CT stands out as the most effective imaging technique for this condition.