Fig. 4.

The arcuate ligament in its entirety and its adjacent relationship with the ulnar nerve. H, Humerus; U: Ulna. A. The surgical knife was cutting the arcuate ligament, releasing the ligament, and exposing the ulnar nerve completely. B. After ulnar neurolysis, the indentation of the arcuate ligament over the ulnar nerve was found, causing ulnar nerve compression. C. The 3D-FIESTA-C sequence showed there was no adipose tissue between the arcuate ligament and ulnar nerve. The circle represented the cross-section of the ulnar nerve. D. The 3D-FIESTA-C sequence showed thinner linear hypointensity of the arcuate ligament and extrusion deformation of the ulnar nerve cross section