Dislocations of the subtalar joint are rare. Peritalar dislocation refers to dislocation at the talocalcaneal and talonavicular joints. Medial dislocation is the most common variety of this dislocation, resulting from severe inversion forces. Total talar dislocation refers to tibiotalar and subtalar joint dislocation.

A	AP radiograph of the ankle. This demonstrates the typical appearance of talonavicular dislocation.
B	Oblique radiograph of the ankle. There is uncovering of the talus, due to dislocation.
C	AP radiograph of the foot. A different patient shows talonavicular dislocation.

Links to online textbooks:

• Wheeless' Orthopedics: discussion of subtalar dislocation

Links to online cases:

• Emedicine.com

References:

• McDermott EP: Basketball injuries of the foot and ankle Clin Sports Med. 1993 Apr;12(2):373-93.           [See related articles]
• Inokuchi S, Hashimoto T, Usami N: Posterior subtalar dislocation J Trauma. 1997 Feb;42(2):310-3.           [See related articles]