Tests -MRI will demonstrate fluid within tendon sheath, thickened tenosynovium, and degenerative or ruptured tendon. Definition -Inflammation of the contents within the sinus tarsi. Contents include a dense ligament and subtalar joint synovium. Anatomy -A cone shaped groove between the talus and calcaneus. The base of the cone faces laterally and the apex is directed medially.
Pronation compresses the contents of the sinus tarsi.
As the talus adducts, in pronation, the lateral process of the talus rotates forward and impacts the anterior calcaneus. Subjective Complaints Lateral ankle pain. Pain increases with walking or standing. Patients are most symptomatic when walking on uneven surfaces. Histories of a long walk on cobblestone streets, uneven hiking trails, etc.