The posterior talonavicular ligament is the plantar aspect of the talonavicular joint capsule, connecting the posterior talar head region to the proximal navicular surface.
Provides posterior talonavicular stability and contributes to the inferior talar head support alongside the spring ligament.
The posterior talonavicular ligament is assessed in flatfoot deformity evaluation — its disruption contributes to talonavicular joint instability. It is preserved during talonavicular fusion to maintain posterior joint access.
Posterior ligament laxity contributing to talonavicular instability in progressive collapsing foot deformity.
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