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ANATOMY The sinus tarsi, also known as the tarsal sinus, is defined as the anatomical space between the neck of the talus and anterosuperior calcaneus. It is roughly cone-shaped, with the wider portion directed anteriorly and laterally.
Sinus tarsi syndrome is a condition of the ankle and foot that results from instability of the subtalar joint. Athletes with this condition typically have complaints of instability with functional activities and persistent anterolateral ankle discomfort.
Weight-bearing x-rays of the foot will demonstrate evidence of impingement in sinus Tarsi. MRI and CT scans will show fluid and often cystic changes in the heel bone (calcaneus) at the level of the jamming (bony impingement). MRI and CT scan are usually not needed unless surgery is being considered.
Features of sinus tarsi syndrome including ill-definition, tearing, delamination / mucinous degeneration of cervical ligament and inferior extensor retinaculum with generalised scarring and ganglion cyst formation (ORANGE ARROWS)
The sinus tarsi is a cone shaped area that lies between the talus to the top, and calcaneus to the bottom. When the nerves within the sinus tarsi become compressed a painful condition called sinus tarsi syndrome results.
The descriptive anatomy of the tarsal sinus, canal and ligaments has been a matter of debate until today because of many inconsistencies in the description and nomenclature of the sinus tarsi ligaments.
Sinus tarsi syndrome is a pathological condition which causes pain and tenderness within the sinus tarsi region of the subtalar joint (STJ) with increased duration and/or intensity of weightbearing activities.