Fig. 4

A 54-year-old woman with sinus tarsi syndrome. Sagittal images (a and b) obtained sequentially in the medial direction indicate an invisible IOLV with tarsal sinus fat edema (*). 3D isotropic sagittal (c) and axial (d) images show a normal IOLV (arrows) with uniform thickness and continuity before posterior talocalcaneal joint. Arthroscopic image (e) of the tarsal sinus reveals the talocalcaneal joint on the right side and a normal IOLV; IOLV, interosseous ligament vertical segment