A talonavicular coalition is one of the less common subtypes of tarsal coalition, the most common being talocalcaneal coalition and calcaneonavicular coalition. As with other forms of coalition, it can be osseous (synostosis), cartilaginous or fibrous.
On this page:
Epidemiology
Associations
Is often associated with:
a great toe that is shorter than the second toe
other deformities
Clinical presentation
It may be unilateral or bilateral. Most patients are asymptomatic or present with foot pain.
Radiographic features
Plain radiograph
AP view
Mushroom sign: the contours of the bone fusion mimic the shape of a mushroom 1.
Lateral view
Shows loss of the talonavicular joint line at the level of Chopart joint.
History and etymology
An osseous talonavicular coalition was first described by R J Anderson in 1879 2.
Unable to process the form. Check for errors and try again.