radiographic evidence of talotarsal dislocation

Interpretation of Relaxed & Neutral Stance Position

Radiographs of the TaloTarsal Joint

Physician Benefit

• Documents objective radiographic evidence of the talotarsal dislocation

• Identifies if there is a flexible/reducibility deformity

• Rules out secondary deformities that may need to be addressed

Patient Benefit

• Educates the patient on their deformity• Assists the patient in determining the most

appropriate treatment course

Lateral View - Normal

• Articular facets are in constant congruent contact

• Forces are balanced on the articular facets

• “Normal” amount of joint mechanism motion is available (no more, no less)

Lateral View - Normal

Sinus tarsi:

in “open” position

Lateral View – TaloTarsal Dislocation

Partial to full obliteration of the sinus tarsi.

Lateral View - Normal

Navicular Position:

Should overlap the dorsal half of the cuboid.

Lateral View – TaloTarsal Dislocation

Navicular has fallen into the plantar half of the

cuboid.

Lateral View - Normal

Sustentaculum Tali:

should be dorsally positioned.

Lateral View – TaloTarsal Dislocation

Sustentaculum tali

has dropped – plantar position.

Lateral View - Normal

Cyma Line:

head of the talus should only be slightly anterior to distal aspect

of the calcaneus.

Lateral View – TaloTarsal Dislocation

Anteriorly Deviated Cyma Line:

head of the talus has dislocated anteriorly.More than just a slightly anterior to the distal aspect of the calcaneus.

Lateral View - Normal

Talar Declination Angle:

< 21 degrees

Lateral View – TaloTarsal Dislocation

Talar Declination Angle:

> 21 degrees

Anterior-Posterior ViewNormal TaloTarsal Joint Alignment

• Talar Second Metatarsal– Ideal is 3-6– Acceptable up to 16

Anterior-Posterior ViewTaloTarsal Joint Dislocation

• Talar Second Metatarsal> 16

• When the bisection of the talus is medial to the 1st metatarsal.

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