Anatomy:
In lateral aspect of foot between neck of talus and anterosuperior surface calcaneus
Continues medially as tarsal canal
Boundary between posterior and anterior subtalar joints
Contains fat, arterial anastomosis, joint capsules, nerve endings,
Five ligaments — cervical ligament, interosseous talocalcaneal ligament, and medial, intermediate and lateral roots of inferior extensor retinaculum
Cervical ligament:
Extracapsular
From cervical tubercle talar neck to calcaneus, medial to EDB origin
Width more than thickness
Limits hindfoot inversion
Interosseous talocalcaneal ligament:
Smaller than cervical ligament
Just anterior to posterior subtalar joint
Makes transverse partition between sulcus tali and sulcus calcaneus
Separates anterior and middle facets of calcaneus from posterior facet
Stabilizes hindfoot
Inferior extensor retinaculum:
Y-shaped - stem excloses long extensor tendons.
Roots are lateral - medial, intermediate and lateral
Limits subtalar inversion
Medial root - calcaneus just anterior to interosseous talocalcaneal ligament attachement, and talus along with interosseous talocalcaneal ligament
Intermediate root - calcaneus just posterior to cervical ligament attachment
Lateral root - calcaneus laterally
Sinus tarsi syndrome:
Causes:
Trauma
Inflammatory arthropathies
Foot deformities - pes cavus, pes planus
References:
1. Lektrakul N et al. Tarsal Sinus: Arthrographic, MR Imaging, MR Arthrographic, and Pathologic Findings in Cadavers and Retrospective Study Data in Patients with Sinus Tarsi Syndrome. Radiology. 2001;219:802-810
