Introduction

Ultrasound of the ulnar nerve is highly valuable, especially at the medial elbow and in Guyon's canal, where the nerve is commonly affected by compression or dynamic irritation. Real-time imaging allows us to follow the nerve through the cubital tunnel, assess thickening, echotexture change, subluxation during elbow flexion, and its relationship to the retinaculum and FCU, helping separate entrapment from overload or post-traumatic pathology. In practice, sonography is also valuable because it visualizes the nerve during movement, making intermittent problems easier to detect, while simultaneously assessing surrounding soft tissues, scar tissue, ganglia, or overload-related structural change.