tarsal coalition CHORUS

Description: abnormal fibrous or bony fusion of one or more tarsal bones etiology: congenital, infection, trauma, articular disorders, surgery
age: 20-30's
symptoms: pain upon standing or with prolonged activity
types:
* calcaneonavicular
  o most common, seen on 45 degree medial oblique view
* talocalcaneal
  o usually b/w talus and sustentaculum tali, talar beaking, talar broadening, narrowing of posterior subtalar joint, ball-and-socket ankle joint
* talonavicular
  o uncommon
* calcaneocuboid
  o very rare