US FDL overlying FHL (Knot of Henry)

This ultrasound image shows a short axis view of the Knot of Henry where the flexor digitorum longus tendon crosses over and becomes superficial to the flexor hallucis longus tendon.

Arrowheads: flexor digitorum longus tendon; *: flexor hallucis longus tendon; dotted ellipse: medial plantar nerve.

Courtesy of Mederic Hall, MD and Sathish Rajasekaran, MD.

Graphic 105091 Version 2.0