Ball and socket ankle joint
Long standing ankle pain. Born with 4 toes!
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The ankle joint has the appearance of a ball and socket joint meaning it can articulate in multiple planes not just dorsi and plantar flexion as per usual. Note fusion of the tarsal bones (talus, calcaneum, cuboid and navicular). The middle cuneiform is absent as is the second ray.
Can be congenital or acquired. In the congenital form it is usually associated with talar fusions and/or absent rays and allows for increased movement at the ankle given that the hindfoot is rigid.